[PATCH] i3c: master: dw-i3c: Balance PM runtime usage count on probe failure

[PATCH] i3c: master: dw-i3c: Balance PM runtime usage count on probe failure

[Felix Gu]

When DW_I3C_DISABLE_RUNTIME_PM_QUIRK is set, the probe function calls
pm_runtime_get_noresume() to prevent runtime suspend. However, if
i3c_master_register() fails, the error path does not balance this
call, leaving the usage count incremented.

Add pm_runtime_put_noidle() in the error cleanup path to properly
balance the usage count.

Fixes: fba0e56ee752 ("i3c: dw: Disable runtime PM on Agilex5 to avoid bus hang on IBI")
Signed-off-by: Felix Gu <ustc.gu@gmail.com>
---
 drivers/i3c/master/dw-i3c-master.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
index d6bdb32397fb..9c8de64c203b 100644
--- a/drivers/i3c/master/dw-i3c-master.c
+++ b/drivers/i3c/master/dw-i3c-master.c
@@ -1669,6 +1669,8 @@ int dw_i3c_common_probe(struct dw_i3c_master *master,
 	return 0;
 
 err_disable_pm:
+	if (master->quirks & DW_I3C_DISABLE_RUNTIME_PM_QUIRK)
+		pm_runtime_put_noidle(&pdev->dev);
 	pm_runtime_disable(&pdev->dev);
 	pm_runtime_set_suspended(&pdev->dev);
 	pm_runtime_dont_use_autosuspend(&pdev->dev);

---
base-commit: b5d083a3ed1e2798396d5e491432e887da8d4a06
change-id: 20260321-dw-i3c-1-92224b35d7e4

Best regards,
-- 
Felix Gu <ustc.gu@gmail.com>

Re: [PATCH] i3c: master: dw-i3c: Balance PM runtime usage count on probe failure

[Frank Li]

On Sat, Mar 21, 2026 at 05:04:43PM +0800, Felix Gu wrote:
> When DW_I3C_DISABLE_RUNTIME_PM_QUIRK is set, the probe function calls
> pm_runtime_get_noresume() to prevent runtime suspend. However, if
> i3c_master_register() fails, the error path does not balance this
> call, leaving the usage count incremented.
>
> Add pm_runtime_put_noidle() in the error cleanup path to properly
> balance the usage count.
>
> Fixes: fba0e56ee752 ("i3c: dw: Disable runtime PM on Agilex5 to avoid bus hang on IBI")
> Signed-off-by: Felix Gu <ustc.gu@gmail.com>
> ---

Reviewed-by: Frank Li <Frank.Li@nxp.com>

>  drivers/i3c/master/dw-i3c-master.c | 2 ++
>  1 file changed, 2 insertions(+)
>
> diff --git a/drivers/i3c/master/dw-i3c-master.c b/drivers/i3c/master/dw-i3c-master.c
> index d6bdb32397fb..9c8de64c203b 100644
> --- a/drivers/i3c/master/dw-i3c-master.c
> +++ b/drivers/i3c/master/dw-i3c-master.c
> @@ -1669,6 +1669,8 @@ int dw_i3c_common_probe(struct dw_i3c_master *master,
>  	return 0;
>
>  err_disable_pm:
> +	if (master->quirks & DW_I3C_DISABLE_RUNTIME_PM_QUIRK)
> +		pm_runtime_put_noidle(&pdev->dev);
>  	pm_runtime_disable(&pdev->dev);
>  	pm_runtime_set_suspended(&pdev->dev);
>  	pm_runtime_dont_use_autosuspend(&pdev->dev);
>
> ---
> base-commit: b5d083a3ed1e2798396d5e491432e887da8d4a06
> change-id: 20260321-dw-i3c-1-92224b35d7e4
>
> Best regards,
> --
> Felix Gu <ustc.gu@gmail.com>
>

Re: [PATCH] i3c: master: dw-i3c: Balance PM runtime usage count on probe failure

[Alexandre Belloni]

On Sat, 21 Mar 2026 17:04:43 +0800, Felix Gu wrote:
> When DW_I3C_DISABLE_RUNTIME_PM_QUIRK is set, the probe function calls
> pm_runtime_get_noresume() to prevent runtime suspend. However, if
> i3c_master_register() fails, the error path does not balance this
> call, leaving the usage count incremented.
> 
> Add pm_runtime_put_noidle() in the error cleanup path to properly
> balance the usage count.
> 
> [...]

Applied, thanks!

[1/1] i3c: master: dw-i3c: Balance PM runtime usage count on probe failure
      https://git.kernel.org/i3c/c/19d6dd322c3f

Best regards,

-- 
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com