[PATCH] wifi: ath11k: fix resource leak on error in ext IRQ setup

[PATCH] wifi: ath11k: fix resource leak on error in ext IRQ setup

[ZhaoJinming]

In ath11k_ahb_config_irq(), when a CE request_irq() fails, the function
returns the error immediately without freeing the CE IRQs that were
successfully registered in previous loop iterations. The probe error
path does not call ath11k_ahb_free_irq() either, so the previously
registered CE IRQ handlers remain attached to the interrupt lines and
are never released.

In ath11k_ahb_config_ext_irq(), when an external request_irq() fails,
the error is only logged and the loop continues. The function then
returns 0 indicating success, leaving the device in a partially
configured state where some external IRQs are not registered. This
causes enable_irq()/disable_irq()/free_irq() to be called on
unregistered IRQs during runtime and remove/shutdown, triggering
WARN_ON(!desc->action), and missing interrupt handlers lead to data
loss.

Additionally, if alloc_netdev_dummy() fails for a later IRQ group, the
function returns -ENOMEM without freeing the ext IRQs and napi_ndev
that were successfully set up for earlier groups.

Fix all three issues: propagate the error up to the caller and unwind
all successfully registered IRQs and allocated resources on failure.

Signed-off-by: ZhaoJinming <zhaojinming@uniontech.com>
---
 drivers/net/wireless/ath/ath11k/ahb.c | 30 ++++++++++++++++++++++++---
 1 file changed, 27 insertions(+), 3 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/ahb.c b/drivers/net/wireless/ath/ath11k/ahb.c
index f566d699d074..041c0fefe8c8 100644
--- a/drivers/net/wireless/ath/ath11k/ahb.c
+++ b/drivers/net/wireless/ath/ath11k/ahb.c
@@ -536,8 +536,10 @@ static int ath11k_ahb_config_ext_irq(struct ath11k_base *ab)
 		irq_grp->grp_id = i;
 
 		irq_grp->napi_ndev = alloc_netdev_dummy(0);
-		if (!irq_grp->napi_ndev)
-			return -ENOMEM;
+		if (!irq_grp->napi_ndev) {
+			irq_grp->num_irq = 0;
+			goto err_request_irq;
+		}
 
 		netif_napi_add(irq_grp->napi_ndev, &irq_grp->napi,
 			       ath11k_ahb_ext_grp_napi_poll);
@@ -600,11 +602,25 @@ static int ath11k_ahb_config_ext_irq(struct ath11k_base *ab)
 			if (ret) {
 				ath11k_err(ab, "failed request_irq for %d\n",
 					   irq);
+				irq_grp->num_irq = j;
+				goto err_request_irq;
 			}
 		}
 	}
 
 	return 0;
+
+err_request_irq:
+	for ( ; i >= 0; i--) {
+		irq_grp = &ab->ext_irq_grp[i];
+		for (j = irq_grp->num_irq - 1; j >= 0; j--)
+			free_irq(ab->irq_num[irq_grp->irqs[j]], irq_grp);
+		if (irq_grp->napi_ndev) {
+			netif_napi_del(&irq_grp->napi);
+			free_netdev(irq_grp->napi_ndev);
+		}
+	}
+	return ret;
 }
 
 static int ath11k_ahb_config_irq(struct ath11k_base *ab)
@@ -629,8 +645,16 @@ static int ath11k_ahb_config_irq(struct ath11k_base *ab)
 		ret = request_irq(irq, ath11k_ahb_ce_interrupt_handler,
 				  IRQF_TRIGGER_RISING, irq_name[irq_idx],
 				  ce_pipe);
-		if (ret)
+		if (ret) {
+			ath11k_err(ab, "failed request_irq for %d\n", irq);
+			for (i--; i >= 0; i--) {
+				if (ath11k_ce_get_attr_flags(ab, i) & CE_ATTR_DIS_INTR)
+					continue;
+				free_irq(ab->irq_num[ATH11K_IRQ_CE0_OFFSET + i],
+					 &ab->ce.ce_pipe[i]);
+			}
 			return ret;
+		}
 
 		ab->irq_num[irq_idx] = irq;
 	}
-- 
2.20.1

Re: [PATCH] wifi: ath11k: fix resource leak on error in ext IRQ setup

[Baochen Qiang]

On 6/22/2026 10:56 AM, ZhaoJinming wrote:
> In ath11k_ahb_config_irq(), when a CE request_irq() fails, the function
> returns the error immediately without freeing the CE IRQs that were
> successfully registered in previous loop iterations. The probe error
> path does not call ath11k_ahb_free_irq() either, so the previously
> registered CE IRQ handlers remain attached to the interrupt lines and
> are never released.
> 
> In ath11k_ahb_config_ext_irq(), when an external request_irq() fails,
> the error is only logged and the loop continues. The function then
> returns 0 indicating success, leaving the device in a partially
> configured state where some external IRQs are not registered. This
> causes enable_irq()/disable_irq()/free_irq() to be called on
> unregistered IRQs during runtime and remove/shutdown, triggering
> WARN_ON(!desc->action), and missing interrupt handlers lead to data
> loss.
> 
> Additionally, if alloc_netdev_dummy() fails for a later IRQ group, the
> function returns -ENOMEM without freeing the ext IRQs and napi_ndev
> that were successfully set up for earlier groups.
> 
> Fix all three issues: propagate the error up to the caller and unwind
> all successfully registered IRQs and allocated resources on failure.
> 
> Signed-off-by: ZhaoJinming <zhaojinming@uniontech.com>
> ---
>  drivers/net/wireless/ath/ath11k/ahb.c | 30 ++++++++++++++++++++++++---
>  1 file changed, 27 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/net/wireless/ath/ath11k/ahb.c b/drivers/net/wireless/ath/ath11k/ahb.c
> index f566d699d074..041c0fefe8c8 100644
> --- a/drivers/net/wireless/ath/ath11k/ahb.c
> +++ b/drivers/net/wireless/ath/ath11k/ahb.c
> @@ -536,8 +536,10 @@ static int ath11k_ahb_config_ext_irq(struct ath11k_base *ab)
>  		irq_grp->grp_id = i;
>  
>  		irq_grp->napi_ndev = alloc_netdev_dummy(0);
> -		if (!irq_grp->napi_ndev)
> -			return -ENOMEM;
> +		if (!irq_grp->napi_ndev) {
> +			irq_grp->num_irq = 0;
> +			goto err_request_irq;
> +		}
>  
>  		netif_napi_add(irq_grp->napi_ndev, &irq_grp->napi,
>  			       ath11k_ahb_ext_grp_napi_poll);
> @@ -600,11 +602,25 @@ static int ath11k_ahb_config_ext_irq(struct ath11k_base *ab)
>  			if (ret) {
>  				ath11k_err(ab, "failed request_irq for %d\n",
>  					   irq);
> +				irq_grp->num_irq = j;
> +				goto err_request_irq;
>  			}
>  		}
>  	}
>  
>  	return 0;
> +
> +err_request_irq:
> +	for ( ; i >= 0; i--) {
> +		irq_grp = &ab->ext_irq_grp[i];

this does not compile since irq_grp is a local variable defined inside the for loop above.

> +		for (j = irq_grp->num_irq - 1; j >= 0; j--)
> +			free_irq(ab->irq_num[irq_grp->irqs[j]], irq_grp);
> +		if (irq_grp->napi_ndev) {
> +			netif_napi_del(&irq_grp->napi);
> +			free_netdev(irq_grp->napi_ndev);
> +		}
> +	}
> +	return ret;
>  }
>  
>  static int ath11k_ahb_config_irq(struct ath11k_base *ab)
> @@ -629,8 +645,16 @@ static int ath11k_ahb_config_irq(struct ath11k_base *ab)
>  		ret = request_irq(irq, ath11k_ahb_ce_interrupt_handler,
>  				  IRQF_TRIGGER_RISING, irq_name[irq_idx],
>  				  ce_pipe);
> -		if (ret)
> +		if (ret) {
> +			ath11k_err(ab, "failed request_irq for %d\n", irq);
> +			for (i--; i >= 0; i--) {
> +				if (ath11k_ce_get_attr_flags(ab, i) & CE_ATTR_DIS_INTR)
> +					continue;
> +				free_irq(ab->irq_num[ATH11K_IRQ_CE0_OFFSET + i],
> +					 &ab->ce.ce_pipe[i]);
> +			}
>  			return ret;
> +		}
>  
>  		ab->irq_num[irq_idx] = irq;
>  	}

[PATCH v2] wifi: ath11k: fix resource leak on error in ext IRQ setup

[ZhaoJinming]

In ath11k_ahb_config_irq(), when a CE request_irq() fails, the function
returns the error immediately without freeing the CE IRQs that were
successfully registered in previous loop iterations. The probe error
path does not call ath11k_ahb_free_irq() either, so the previously
registered CE IRQ handlers remain attached to the interrupt lines and
are never released.

In ath11k_ahb_config_ext_irq(), when an external request_irq() fails,
the error is only logged and the loop continues. The function then
returns 0 indicating success, leaving the device in a partially
configured state where some external IRQs are not registered. This
causes enable_irq()/disable_irq()/free_irq() to be called on
unregistered IRQs during runtime and remove/shutdown, triggering
WARN_ON(!desc->action), and missing interrupt handlers lead to data
loss.

Additionally, if alloc_netdev_dummy() fails for a later IRQ group, the
function returns -ENOMEM without freeing the ext IRQs and napi_ndev
that were successfully set up for earlier groups.

Fix all three issues: propagate the error up to the caller and unwind
all successfully registered IRQs and allocated resources on failure.

Signed-off-by: ZhaoJinming <zhaojinming@uniontech.com>
---

Changes in v2:
- Move `irq_grp` declaration from for-loop body to function scope to fix
  compile error in err_request_irq error path.
- Set ret = -ENOMEM before goto err_request_irq on alloc_netdev_dummy()
  failure to avoid returning uninitialized value.
- When ath11k_ahb_config_ext_irq() fails, unwind the already-registered
  CE IRQs via a shared err_ce_irq cleanup path to avoid leaking them.

 drivers/net/wireless/ath/ath11k/ahb.c | 48 ++++++++++++++++++++++++++--
 1 file changed, 44 insertions(+), 4 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/ahb.c b/drivers/net/wireless/ath/ath11k/ahb.c
index f566d699d074..11bafbd94aff 100644
--- a/drivers/net/wireless/ath/ath11k/ahb.c
+++ b/drivers/net/wireless/ath/ath11k/ahb.c
@@ -524,20 +524,24 @@ static irqreturn_t ath11k_ahb_ext_interrupt_handler(int irq, void *arg)
 static int ath11k_ahb_config_ext_irq(struct ath11k_base *ab)
 {
 	struct ath11k_hw_params *hw = &ab->hw_params;
+	struct ath11k_ext_irq_grp *irq_grp;
 	int i, j;
 	int irq;
 	int ret;
 
 	for (i = 0; i < ATH11K_EXT_IRQ_GRP_NUM_MAX; i++) {
-		struct ath11k_ext_irq_grp *irq_grp = &ab->ext_irq_grp[i];
+		irq_grp = &ab->ext_irq_grp[i];
 		u32 num_irq = 0;
 
 		irq_grp->ab = ab;
 		irq_grp->grp_id = i;
 
 		irq_grp->napi_ndev = alloc_netdev_dummy(0);
-		if (!irq_grp->napi_ndev)
-			return -ENOMEM;
+		if (!irq_grp->napi_ndev) {
+			ret = -ENOMEM;
+			irq_grp->num_irq = 0;
+			goto err_request_irq;
+		}
 
 		netif_napi_add(irq_grp->napi_ndev, &irq_grp->napi,
 			       ath11k_ahb_ext_grp_napi_poll);
@@ -600,11 +604,25 @@ static int ath11k_ahb_config_ext_irq(struct ath11k_base *ab)
 			if (ret) {
 				ath11k_err(ab, "failed request_irq for %d\n",
 					   irq);
+				irq_grp->num_irq = j;
+				goto err_request_irq;
 			}
 		}
 	}
 
 	return 0;
+
+err_request_irq:
+	for ( ; i >= 0; i--) {
+		irq_grp = &ab->ext_irq_grp[i];
+		for (j = irq_grp->num_irq - 1; j >= 0; j--)
+			free_irq(ab->irq_num[irq_grp->irqs[j]], irq_grp);
+		if (irq_grp->napi_ndev) {
+			netif_napi_del(&irq_grp->napi);
+			free_netdev(irq_grp->napi_ndev);
+		}
+	}
+	return ret;
 }
 
 static int ath11k_ahb_config_irq(struct ath11k_base *ab)
@@ -629,15 +647,30 @@ static int ath11k_ahb_config_irq(struct ath11k_base *ab)
 		ret = request_irq(irq, ath11k_ahb_ce_interrupt_handler,
 				  IRQF_TRIGGER_RISING, irq_name[irq_idx],
 				  ce_pipe);
-		if (ret)
-			return ret;
+		if (ret) {
+			ath11k_err(ab, "failed request_irq for %d\n", irq);
+			goto err_ce_irq;
+		}
 
 		ab->irq_num[irq_idx] = irq;
 	}
 
 	/* Configure external interrupts */
 	ret = ath11k_ahb_config_ext_irq(ab);
+	if (ret) {
+		ath11k_err(ab, "failed to configure ext irq: %d\n", ret);
+		goto err_ce_irq;
+	}
+
+	return 0;
 
+err_ce_irq:
+	for (i--; i >= 0; i--) {
+		if (ath11k_ce_get_attr_flags(ab, i) & CE_ATTR_DIS_INTR)
+			continue;
+		free_irq(ab->irq_num[ATH11K_IRQ_CE0_OFFSET + i],
+			 &ab->ce.ce_pipe[i]);
+	}
 	return ret;
 }
 
-- 
2.20.1

Re: [PATCH v2] wifi: ath11k: fix resource leak on error in ext IRQ setup

[Baochen Qiang]

On 7/13/2026 6:59 PM, ZhaoJinming wrote:
> In ath11k_ahb_config_irq(), when a CE request_irq() fails, the function
> returns the error immediately without freeing the CE IRQs that were
> successfully registered in previous loop iterations. The probe error
> path does not call ath11k_ahb_free_irq() either, so the previously
> registered CE IRQ handlers remain attached to the interrupt lines and
> are never released.
> 
> In ath11k_ahb_config_ext_irq(), when an external request_irq() fails,
> the error is only logged and the loop continues. The function then
> returns 0 indicating success, leaving the device in a partially
> configured state where some external IRQs are not registered. This
> causes enable_irq()/disable_irq()/free_irq() to be called on
> unregistered IRQs during runtime and remove/shutdown, triggering
> WARN_ON(!desc->action), and missing interrupt handlers lead to data
> loss.
> 
> Additionally, if alloc_netdev_dummy() fails for a later IRQ group, the
> function returns -ENOMEM without freeing the ext IRQs and napi_ndev
> that were successfully set up for earlier groups.
> 
> Fix all three issues: propagate the error up to the caller and unwind
> all successfully registered IRQs and allocated resources on failure.
> 
> Signed-off-by: ZhaoJinming <zhaojinming@uniontech.com>
> ---
> 
> Changes in v2:
> - Move `irq_grp` declaration from for-loop body to function scope to fix
>   compile error in err_request_irq error path.
> - Set ret = -ENOMEM before goto err_request_irq on alloc_netdev_dummy()
>   failure to avoid returning uninitialized value.
> - When ath11k_ahb_config_ext_irq() fails, unwind the already-registered
>   CE IRQs via a shared err_ce_irq cleanup path to avoid leaking them.
> 
>  drivers/net/wireless/ath/ath11k/ahb.c | 48 ++++++++++++++++++++++++++--
>  1 file changed, 44 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/net/wireless/ath/ath11k/ahb.c b/drivers/net/wireless/ath/ath11k/ahb.c
> index f566d699d074..11bafbd94aff 100644
> --- a/drivers/net/wireless/ath/ath11k/ahb.c
> +++ b/drivers/net/wireless/ath/ath11k/ahb.c
> @@ -524,20 +524,24 @@ static irqreturn_t ath11k_ahb_ext_interrupt_handler(int irq, void *arg)
>  static int ath11k_ahb_config_ext_irq(struct ath11k_base *ab)
>  {
>  	struct ath11k_hw_params *hw = &ab->hw_params;
> +	struct ath11k_ext_irq_grp *irq_grp;
>  	int i, j;
>  	int irq;
>  	int ret;
>  
>  	for (i = 0; i < ATH11K_EXT_IRQ_GRP_NUM_MAX; i++) {
> -		struct ath11k_ext_irq_grp *irq_grp = &ab->ext_irq_grp[i];
> +		irq_grp = &ab->ext_irq_grp[i];
>  		u32 num_irq = 0;

declaration after statement. better to have num_irq declaration at the beginning of the
for loop.

>  
>  		irq_grp->ab = ab;
>  		irq_grp->grp_id = i;
>  
>  		irq_grp->napi_ndev = alloc_netdev_dummy(0);
> -		if (!irq_grp->napi_ndev)
> -			return -ENOMEM;
> +		if (!irq_grp->napi_ndev) {
> +			ret = -ENOMEM;
> +			irq_grp->num_irq = 0;

the ath12k_base is allocated by kzalloc, so the ext_irq_grp array, as a member of
ath12k_base, is already zero'ed, hence this re-initialization is redundant. But I am OK
with it since it improves code readability.

> +			goto err_request_irq;
> +		}
>  
>  		netif_napi_add(irq_grp->napi_ndev, &irq_grp->napi,
>  			       ath11k_ahb_ext_grp_napi_poll);
> @@ -600,11 +604,25 @@ static int ath11k_ahb_config_ext_irq(struct ath11k_base *ab)
>  			if (ret) {
>  				ath11k_err(ab, "failed request_irq for %d\n",
>  					   irq);
> +				irq_grp->num_irq = j;

with this forcing to the number of successful irq request ...

> +				goto err_request_irq;
>  			}
>  		}
>  	}
>  
>  	return 0;
> +
> +err_request_irq:
> +	for ( ; i >= 0; i--) {

then with the index starting from the failed loop ...

> +		irq_grp = &ab->ext_irq_grp[i];
> +		for (j = irq_grp->num_irq - 1; j >= 0; j--)
> +			free_irq(ab->irq_num[irq_grp->irqs[j]], irq_grp);
> +		if (irq_grp->napi_ndev) {

and with the guard ...

> +			netif_napi_del(&irq_grp->napi);
> +			free_netdev(irq_grp->napi_ndev);
> +		}
> +	}

at the cost of above three, the centralized err handling is working. Yeah this simplifies
the code, but makes it hard to understand.

what about:

1. refactor the existing ath11k_ahb_free_ext_irq():

ath11k_ahb_free_ext_irq_grp()
{
	for (j = 0; j < irq_grp->num_irq; j++)
		free_irq(ab->irq_num[irq_grp->irqs[j]], irq_grp);

	netif_napi_del(&irq_grp->napi);
	free_netdev(irq_grp->napi_ndev);
}

then we can have

ath11k_ahb_free_ext_irq()
{
	for (i = 0; i < ATH11K_EXT_IRQ_GRP_NUM_MAX; i++)
		ath11k_ahb_free_ext_irq_grp(irq_grp)
}

and the complete err handling of ext irq can be

ath11k_ahb_config_ext_irq()
{
	for (i = 0; i < ATH11K_EXT_IRQ_GRP_NUM_MAX; i++) {

		irq_grp->napi_ndev = alloc_netdev_dummy(0);
		if (!irq_grp->napi_ndev) {
			ret = -ENOMEM;
			irq_grp->num_irq = 0;
			goto err_request_irq;
		}

		...

		for (j = 0; j < num_irq; j++) {
			ret = request_irq();
			if (ret) {
				irq_grp->num_irq = j;
				ath11k_ahb_free_ext_irq_grp(irq_grp);
				goto err_request_irq;
			}
		}

		irq_grp->num_irq = num_irq;
	}

err_request_irq:
	for ( i--; i >= 0; i--) {
		irq_grp = &ab->ext_irq_grp[i];
		ath11k_ahb_free_ext_irq_grp(irq_grp);
	}

	return ret;
}
	
> +	return ret;
>  }
>  
>  static int ath11k_ahb_config_irq(struct ath11k_base *ab)
> @@ -629,15 +647,30 @@ static int ath11k_ahb_config_irq(struct ath11k_base *ab)
>  		ret = request_irq(irq, ath11k_ahb_ce_interrupt_handler,
>  				  IRQF_TRIGGER_RISING, irq_name[irq_idx],
>  				  ce_pipe);
> -		if (ret)
> -			return ret;
> +		if (ret) {
> +			ath11k_err(ab, "failed request_irq for %d\n", irq);
> +			goto err_ce_irq;
> +		}
>  
>  		ab->irq_num[irq_idx] = irq;
>  	}
>  
>  	/* Configure external interrupts */
>  	ret = ath11k_ahb_config_ext_irq(ab);
> +	if (ret) {
> +		ath11k_err(ab, "failed to configure ext irq: %d\n", ret);
> +		goto err_ce_irq;
> +	}
> +
> +	return 0;
>  
> +err_ce_irq:
> +	for (i--; i >= 0; i--) {
> +		if (ath11k_ce_get_attr_flags(ab, i) & CE_ATTR_DIS_INTR)
> +			continue;
> +		free_irq(ab->irq_num[ATH11K_IRQ_CE0_OFFSET + i],
> +			 &ab->ce.ce_pipe[i]);
> +	}

this is also a duplication of the CE part of ath11k_ahb_free_irq(), consider refactoring
the exsiting helper and reuse it.

>  	return ret;
>  }
>  

[PATCH v3] wifi: ath11k: fix resource leak on error in ext IRQ setup

[ZhaoJinming]

In ath11k_ahb_config_irq(), when a CE request_irq() fails, the function
returns the error immediately without freeing the CE IRQs that were
successfully registered in previous loop iterations. The probe error
path does not call ath11k_ahb_free_irq() either, so the previously
registered CE IRQ handlers remain attached to the interrupt lines and
are never released.

In ath11k_ahb_config_ext_irq(), when an external request_irq() fails,
the error is only logged and the loop continues. The function then
returns 0 indicating success, leaving the device in a partially
configured state where some external IRQs are not registered. This
causes enable_irq()/disable_irq()/free_irq() to be called on
unregistered IRQs during runtime and remove/shutdown, triggering
WARN_ON(!desc->action), and missing interrupt handlers lead to data
loss.

Additionally, if alloc_netdev_dummy() fails for a later IRQ group, the
function returns -ENOMEM without freeing the ext IRQs and napi_ndev
that were successfully set up for earlier groups.

Fix all three issues: propagate the error up to the caller and unwind
all successfully registered IRQs and allocated resources on failure.

Signed-off-by: ZhaoJinming <zhaojinming@uniontech.com>
---

Changes in v3:
- Extract ath11k_ahb_free_ext_irq_grp() to handle per-group ext IRQ
  cleanup and refactor ath11k_ahb_free_ext_irq() to use it. Add a NULL
  check for napi_ndev to avoid potential NULL pointer dereference since
  free_netdev() does not guard against NULL input.
- On request_irq() failure in ath11k_ahb_config_ext_irq(), immediately
  clean up the current group via ath11k_ahb_free_ext_irq_grp() before
  jumping to the error label to unwind earlier groups.
- Move u32 num_irq declaration before the irq_grp assignment to follow
  declaration-before-statement ordering.
- Extract ath11k_ahb_free_ce_irqs() to handle partial/full CE IRQ cleanup
  and refactor ath11k_ahb_free_irq() to use it, replacing the duplicated
  err_ce_irq cleanup loop in ath11k_ahb_config_irq().

Changes in v2:
- Move `irq_grp` declaration from for-loop body to function scope to fix
  compile error in err_request_irq error path.
- Set ret = -ENOMEM before goto err_request_irq on alloc_netdev_dummy()
  failure to avoid returning uninitialized value.
- When ath11k_ahb_config_ext_irq() fails, unwind the already-registered
  CE IRQs via a shared err_ce_irq cleanup path to avoid leaking them.

diff --git a/drivers/net/wireless/ath/ath11k/ahb.c b/drivers/net/wireless/ath/ath11k/ahb.c
index f566d699d074..1a9408138d81 100644
--- a/drivers/net/wireless/ath/ath11k/ahb.c
+++ b/drivers/net/wireless/ath/ath11k/ahb.c
@@ -431,36 +431,47 @@ static void ath11k_ahb_init_qmi_ce_config(struct ath11k_base *ab)
 	ab->qmi.service_ins_id = ab->hw_params.qmi_service_ins_id;
 }
 
-static void ath11k_ahb_free_ext_irq(struct ath11k_base *ab)
+static void ath11k_ahb_free_ext_irq_grp(struct ath11k_base *ab,
+				      struct ath11k_ext_irq_grp *irq_grp)
 {
-	int i, j;
+	int j;
 
-	for (i = 0; i < ATH11K_EXT_IRQ_GRP_NUM_MAX; i++) {
-		struct ath11k_ext_irq_grp *irq_grp = &ab->ext_irq_grp[i];
+	for (j = 0; j < irq_grp->num_irq; j++)
+		free_irq(ab->irq_num[irq_grp->irqs[j]], irq_grp);
 
-		for (j = 0; j < irq_grp->num_irq; j++)
-			free_irq(ab->irq_num[irq_grp->irqs[j]], irq_grp);
+	if (!irq_grp->napi_ndev)
+		return;
 
-		netif_napi_del(&irq_grp->napi);
-		free_netdev(irq_grp->napi_ndev);
-	}
+	netif_napi_del(&irq_grp->napi);
+	free_netdev(irq_grp->napi_ndev);
 }
 
-static void ath11k_ahb_free_irq(struct ath11k_base *ab)
+static void ath11k_ahb_free_ext_irq(struct ath11k_base *ab)
 {
-	int irq_idx;
 	int i;
 
-	if (ab->hw_params.hybrid_bus_type)
-		return ath11k_pcic_free_irq(ab);
+	for (i = 0; i < ATH11K_EXT_IRQ_GRP_NUM_MAX; i++)
+		ath11k_ahb_free_ext_irq_grp(ab, &ab->ext_irq_grp[i]);
+}
 
-	for (i = 0; i < ab->hw_params.ce_count; i++) {
+static void ath11k_ahb_free_ce_irqs(struct ath11k_base *ab, int max_idx)
+{
+	int irq_idx, i;
+
+	for (i = 0; i < max_idx; i++) {
 		if (ath11k_ce_get_attr_flags(ab, i) & CE_ATTR_DIS_INTR)
 			continue;
 		irq_idx = ATH11K_IRQ_CE0_OFFSET + i;
 		free_irq(ab->irq_num[irq_idx], &ab->ce.ce_pipe[i]);
 	}
+}
+
+static void ath11k_ahb_free_irq(struct ath11k_base *ab)
+{
+	if (ab->hw_params.hybrid_bus_type)
+		return ath11k_pcic_free_irq(ab);
 
+	ath11k_ahb_free_ce_irqs(ab, ab->hw_params.ce_count);
 	ath11k_ahb_free_ext_irq(ab);
 }
 
@@ -524,20 +535,25 @@ static irqreturn_t ath11k_ahb_ext_interrupt_handler(int irq, void *arg)
 static int ath11k_ahb_config_ext_irq(struct ath11k_base *ab)
 {
 	struct ath11k_hw_params *hw = &ab->hw_params;
+	struct ath11k_ext_irq_grp *irq_grp;
 	int i, j;
 	int irq;
 	int ret;
 
 	for (i = 0; i < ATH11K_EXT_IRQ_GRP_NUM_MAX; i++) {
-		struct ath11k_ext_irq_grp *irq_grp = &ab->ext_irq_grp[i];
 		u32 num_irq = 0;
 
+		irq_grp = &ab->ext_irq_grp[i];
+
 		irq_grp->ab = ab;
 		irq_grp->grp_id = i;
 
 		irq_grp->napi_ndev = alloc_netdev_dummy(0);
-		if (!irq_grp->napi_ndev)
-			return -ENOMEM;
+		if (!irq_grp->napi_ndev) {
+			ret = -ENOMEM;
+			irq_grp->num_irq = 0;
+			goto err_request_irq;
+		}
 
 		netif_napi_add(irq_grp->napi_ndev, &irq_grp->napi,
 			       ath11k_ahb_ext_grp_napi_poll);
@@ -585,9 +601,7 @@ static int ath11k_ahb_config_ext_irq(struct ath11k_base *ab)
 				}
 			}
 		}
-		irq_grp->num_irq = num_irq;
-
-		for (j = 0; j < irq_grp->num_irq; j++) {
+		for (j = 0; j < num_irq; j++) {
 			int irq_idx = irq_grp->irqs[j];
 
 			irq = platform_get_irq_byname(ab->pdev,
@@ -600,11 +614,23 @@ static int ath11k_ahb_config_ext_irq(struct ath11k_base *ab)
 			if (ret) {
 				ath11k_err(ab, "failed request_irq for %d\n",
 					   irq);
+				irq_grp->num_irq = j;
+				ath11k_ahb_free_ext_irq_grp(ab, irq_grp);
+				goto err_request_irq;
 			}
 		}
+
+		irq_grp->num_irq = num_irq;
 	}
 
 	return 0;
+
+err_request_irq:
+	for (i--; i >= 0; i--) {
+		irq_grp = &ab->ext_irq_grp[i];
+		ath11k_ahb_free_ext_irq_grp(ab, irq_grp);
+	}
+	return ret;
 }
 
 static int ath11k_ahb_config_irq(struct ath11k_base *ab)
@@ -629,16 +655,24 @@ static int ath11k_ahb_config_irq(struct ath11k_base *ab)
 		ret = request_irq(irq, ath11k_ahb_ce_interrupt_handler,
 				  IRQF_TRIGGER_RISING, irq_name[irq_idx],
 				  ce_pipe);
-		if (ret)
+		if (ret) {
+			ath11k_err(ab, "failed request_irq for %d\n", irq);
+			ath11k_ahb_free_ce_irqs(ab, i);
 			return ret;
+		}
 
 		ab->irq_num[irq_idx] = irq;
 	}
 
 	/* Configure external interrupts */
 	ret = ath11k_ahb_config_ext_irq(ab);
+	if (ret) {
+		ath11k_err(ab, "failed to configure ext irq: %d\n", ret);
+		ath11k_ahb_free_ce_irqs(ab, ab->hw_params.ce_count);
+		return ret;
+	}
 
-	return ret;
+	return 0;
 }
 
 static int ath11k_ahb_map_service_to_pipe(struct ath11k_base *ab, u16 service_id,

Re: [PATCH v3] wifi: ath11k: fix resource leak on error in ext IRQ setup

[Baochen Qiang]

On 7/16/2026 7:46 PM, ZhaoJinming wrote:
> In ath11k_ahb_config_irq(), when a CE request_irq() fails, the function
> returns the error immediately without freeing the CE IRQs that were
> successfully registered in previous loop iterations. The probe error
> path does not call ath11k_ahb_free_irq() either, so the previously
> registered CE IRQ handlers remain attached to the interrupt lines and
> are never released.
> 
> In ath11k_ahb_config_ext_irq(), when an external request_irq() fails,
> the error is only logged and the loop continues. The function then
> returns 0 indicating success, leaving the device in a partially
> configured state where some external IRQs are not registered. This
> causes enable_irq()/disable_irq()/free_irq() to be called on
> unregistered IRQs during runtime and remove/shutdown, triggering
> WARN_ON(!desc->action), and missing interrupt handlers lead to data
> loss.
> 
> Additionally, if alloc_netdev_dummy() fails for a later IRQ group, the
> function returns -ENOMEM without freeing the ext IRQs and napi_ndev
> that were successfully set up for earlier groups.
> 
> Fix all three issues: propagate the error up to the caller and unwind
> all successfully registered IRQs and allocated resources on failure.
> 
> Signed-off-by: ZhaoJinming <zhaojinming@uniontech.com>
> ---
> 
> Changes in v3:
> - Extract ath11k_ahb_free_ext_irq_grp() to handle per-group ext IRQ
>   cleanup and refactor ath11k_ahb_free_ext_irq() to use it. Add a NULL
>   check for napi_ndev to avoid potential NULL pointer dereference since
>   free_netdev() does not guard against NULL input.
> - On request_irq() failure in ath11k_ahb_config_ext_irq(), immediately
>   clean up the current group via ath11k_ahb_free_ext_irq_grp() before
>   jumping to the error label to unwind earlier groups.
> - Move u32 num_irq declaration before the irq_grp assignment to follow
>   declaration-before-statement ordering.
> - Extract ath11k_ahb_free_ce_irqs() to handle partial/full CE IRQ cleanup
>   and refactor ath11k_ahb_free_irq() to use it, replacing the duplicated
>   err_ce_irq cleanup loop in ath11k_ahb_config_irq().
> 
> Changes in v2:
> - Move `irq_grp` declaration from for-loop body to function scope to fix
>   compile error in err_request_irq error path.
> - Set ret = -ENOMEM before goto err_request_irq on alloc_netdev_dummy()
>   failure to avoid returning uninitialized value.
> - When ath11k_ahb_config_ext_irq() fails, unwind the already-registered
>   CE IRQs via a shared err_ce_irq cleanup path to avoid leaking them.
> 
> diff --git a/drivers/net/wireless/ath/ath11k/ahb.c b/drivers/net/wireless/ath/ath11k/ahb.c
> index f566d699d074..1a9408138d81 100644
> --- a/drivers/net/wireless/ath/ath11k/ahb.c
> +++ b/drivers/net/wireless/ath/ath11k/ahb.c
> @@ -431,36 +431,47 @@ static void ath11k_ahb_init_qmi_ce_config(struct ath11k_base *ab)
>  	ab->qmi.service_ins_id = ab->hw_params.qmi_service_ins_id;
>  }
>  
> -static void ath11k_ahb_free_ext_irq(struct ath11k_base *ab)
> +static void ath11k_ahb_free_ext_irq_grp(struct ath11k_base *ab,
> +				      struct ath11k_ext_irq_grp *irq_grp)
>  {
> -	int i, j;
> +	int j;
>  
> -	for (i = 0; i < ATH11K_EXT_IRQ_GRP_NUM_MAX; i++) {
> -		struct ath11k_ext_irq_grp *irq_grp = &ab->ext_irq_grp[i];
> +	for (j = 0; j < irq_grp->num_irq; j++)
> +		free_irq(ab->irq_num[irq_grp->irqs[j]], irq_grp);
>  
> -		for (j = 0; j < irq_grp->num_irq; j++)
> -			free_irq(ab->irq_num[irq_grp->irqs[j]], irq_grp);
> +	if (!irq_grp->napi_ndev)
> +		return;


irq_grp->napi_ndev can not be NULL in exsiting code, hence this is not reachable. A silent
guard against a state that cannot happen has real downsides, regardless of what it's guarding:

- It documents a code path that doesn't exist. The next person to touch this will assume
the guarded condition is reachable and may build further logic on that false premise,
spreading a phantom case through the code.
- It discourages proving the invariant. The check silently substitutes for the reasoning
"can this actually occur here?" — the exact analysis a reader should do — which invites
less rigorous code over time.
- It hides bugs and delays them. If the invariant is ever broken by a future change, the
silent early return swallows it instead of failing where the root cause is. What should be
an immediate, on-the-spot failure becomes a displaced, delayed symptom that looks
unrelated to its cause and is far harder to debug. If a "can't happen" condition is
genuinely worth asserting, the right tool is a loud warning — never a quiet return that
masks it.

So I'd drop the guard.

>  
> -		netif_napi_del(&irq_grp->napi);
> -		free_netdev(irq_grp->napi_ndev);
> -	}
> +	netif_napi_del(&irq_grp->napi);
> +	free_netdev(irq_grp->napi_ndev);
>  }
>  
> -static void ath11k_ahb_free_irq(struct ath11k_base *ab)
> +static void ath11k_ahb_free_ext_irq(struct ath11k_base *ab)
>  {
> -	int irq_idx;
>  	int i;
>  
> -	if (ab->hw_params.hybrid_bus_type)
> -		return ath11k_pcic_free_irq(ab);
> +	for (i = 0; i < ATH11K_EXT_IRQ_GRP_NUM_MAX; i++)
> +		ath11k_ahb_free_ext_irq_grp(ab, &ab->ext_irq_grp[i]);
> +}
>  
> -	for (i = 0; i < ab->hw_params.ce_count; i++) {
> +static void ath11k_ahb_free_ce_irqs(struct ath11k_base *ab, int max_idx)
> +{
> +	int irq_idx, i;
> +
> +	for (i = 0; i < max_idx; i++) {
>  		if (ath11k_ce_get_attr_flags(ab, i) & CE_ATTR_DIS_INTR)
>  			continue;
>  		irq_idx = ATH11K_IRQ_CE0_OFFSET + i;
>  		free_irq(ab->irq_num[irq_idx], &ab->ce.ce_pipe[i]);
>  	}
> +}
> +
> +static void ath11k_ahb_free_irq(struct ath11k_base *ab)
> +{
> +	if (ab->hw_params.hybrid_bus_type)
> +		return ath11k_pcic_free_irq(ab);
>  
> +	ath11k_ahb_free_ce_irqs(ab, ab->hw_params.ce_count);
>  	ath11k_ahb_free_ext_irq(ab);
>  }
>  
> @@ -524,20 +535,25 @@ static irqreturn_t ath11k_ahb_ext_interrupt_handler(int irq, void *arg)
>  static int ath11k_ahb_config_ext_irq(struct ath11k_base *ab)
>  {
>  	struct ath11k_hw_params *hw = &ab->hw_params;
> +	struct ath11k_ext_irq_grp *irq_grp;
>  	int i, j;
>  	int irq;
>  	int ret;
>  
>  	for (i = 0; i < ATH11K_EXT_IRQ_GRP_NUM_MAX; i++) {
> -		struct ath11k_ext_irq_grp *irq_grp = &ab->ext_irq_grp[i];
>  		u32 num_irq = 0;
>  
> +		irq_grp = &ab->ext_irq_grp[i];
> +
>  		irq_grp->ab = ab;
>  		irq_grp->grp_id = i;
>  
>  		irq_grp->napi_ndev = alloc_netdev_dummy(0);
> -		if (!irq_grp->napi_ndev)
> -			return -ENOMEM;
> +		if (!irq_grp->napi_ndev) {
> +			ret = -ENOMEM;
> +			irq_grp->num_irq = 0;
> +			goto err_request_irq;
> +		}
>  
>  		netif_napi_add(irq_grp->napi_ndev, &irq_grp->napi,
>  			       ath11k_ahb_ext_grp_napi_poll);
> @@ -585,9 +601,7 @@ static int ath11k_ahb_config_ext_irq(struct ath11k_base *ab)
>  				}
>  			}
>  		}
> -		irq_grp->num_irq = num_irq;
> -
> -		for (j = 0; j < irq_grp->num_irq; j++) {
> +		for (j = 0; j < num_irq; j++) {
>  			int irq_idx = irq_grp->irqs[j];
>  
>  			irq = platform_get_irq_byname(ab->pdev,
> @@ -600,11 +614,23 @@ static int ath11k_ahb_config_ext_irq(struct ath11k_base *ab)
>  			if (ret) {
>  				ath11k_err(ab, "failed request_irq for %d\n",
>  					   irq);
> +				irq_grp->num_irq = j;
> +				ath11k_ahb_free_ext_irq_grp(ab, irq_grp);
> +				goto err_request_irq;
>  			}
>  		}
> +
> +		irq_grp->num_irq = num_irq;
>  	}
>  
>  	return 0;
> +
> +err_request_irq:
> +	for (i--; i >= 0; i--) {
> +		irq_grp = &ab->ext_irq_grp[i];
> +		ath11k_ahb_free_ext_irq_grp(ab, irq_grp);
> +	}
> +	return ret;
>  }
>  
>  static int ath11k_ahb_config_irq(struct ath11k_base *ab)
> @@ -629,16 +655,24 @@ static int ath11k_ahb_config_irq(struct ath11k_base *ab)
>  		ret = request_irq(irq, ath11k_ahb_ce_interrupt_handler,
>  				  IRQF_TRIGGER_RISING, irq_name[irq_idx],
>  				  ce_pipe);
> -		if (ret)
> +		if (ret) {
> +			ath11k_err(ab, "failed request_irq for %d\n", irq);
> +			ath11k_ahb_free_ce_irqs(ab, i);
>  			return ret;
> +		}
>  
>  		ab->irq_num[irq_idx] = irq;
>  	}
>  
>  	/* Configure external interrupts */
>  	ret = ath11k_ahb_config_ext_irq(ab);
> +	if (ret) {
> +		ath11k_err(ab, "failed to configure ext irq: %d\n", ret);
> +		ath11k_ahb_free_ce_irqs(ab, ab->hw_params.ce_count);
> +		return ret;
> +	}
>  
> -	return ret;
> +	return 0;
>  }
>  
>  static int ath11k_ahb_map_service_to_pipe(struct ath11k_base *ab, u16 service_id,

others look good to me. Hence with the sanity guard removed:

Reviewed-by: Baochen Qiang <baochen.qiang@oss.qualcomm.com>