[PATCH] i2c: ocores: add missing unwind goto in `ocores_i2c_probe`

[PATCH] i2c: ocores: add missing unwind goto in `ocores_i2c_probe`

[Wang Zhang]

The error handling code after the err_clk label should be executed to
release any resources that were allocated for the clock if a negative
error code returned.

Fix this by assigning irq to ret and changing the direct return to err_clk.

Signed-off-by: Wang Zhang <silver_code@hust.edu.cn>
Reviewed-by: Dongliang Mu <dzm91@hust.edu.cn>
---
 drivers/i2c/busses/i2c-ocores.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c
index a0af027db04c..95efad5a5a28 100644
--- a/drivers/i2c/busses/i2c-ocores.c
+++ b/drivers/i2c/busses/i2c-ocores.c
@@ -697,8 +697,10 @@ static int ocores_i2c_probe(struct platform_device *pdev)
 	if (irq == -ENXIO) {
 		ocores_algorithm.master_xfer = ocores_xfer_polling;
 	} else {
-		if (irq < 0)
-			return irq;
+		if (irq < 0) {
+			ret = irq;
+			goto err_clk;
+		}
 	}
 
 	if (ocores_algorithm.master_xfer != ocores_xfer_polling) {
-- 
2.34.1

[PATCH] i2c: ocores: add missing unwind goto in `ocores_i2c_probe`

[Wang Zhang]

platform_get_irq_optional is a function used to obtain an IRQ
number for a device on a platform. The function returns the IRQ number
associated with the specified device, or a negative error code if it fails.

The error handling code after the err_clk label should be executed to
release any resources that were allocated for the clock if a negative
error code returned.

Fix this by assigning irq to ret and changing the direct return to err_clk.

Signed-off-by: Wang Zhang <silver_code@hust.edu.cn>
Reviewed-by: Dongliang Mu <dzm91@hust.edu.cn>
---
 drivers/i2c/busses/i2c-ocores.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/i2c/busses/i2c-ocores.c b/drivers/i2c/busses/i2c-ocores.c
index a0af027db04c..95efad5a5a28 100644
--- a/drivers/i2c/busses/i2c-ocores.c
+++ b/drivers/i2c/busses/i2c-ocores.c
@@ -697,8 +697,10 @@ static int ocores_i2c_probe(struct platform_device *pdev)
 	if (irq == -ENXIO) {
 		ocores_algorithm.master_xfer = ocores_xfer_polling;
 	} else {
-		if (irq < 0)
-			return irq;
+		if (irq < 0) {
+			ret = irq;
+			goto err_clk;
+		}
 	}
 
 	if (ocores_algorithm.master_xfer != ocores_xfer_polling) {
-- 
2.34.1

Re: [PATCH] i2c: ocores: add missing unwind goto in `ocores_i2c_probe`

[Andrew Lunn]

On Sun, Apr 16, 2023 at 03:20:40PM +0800, Wang Zhang wrote:
> platform_get_irq_optional is a function used to obtain an IRQ
> number for a device on a platform. The function returns the IRQ number
> associated with the specified device, or a negative error code if it fails.
> 
> The error handling code after the err_clk label should be executed to
> release any resources that were allocated for the clock if a negative
> error code returned.
> 
> Fix this by assigning irq to ret and changing the direct return to err_clk.

The clock is got in ocores_i2c_of_probe(). That function is not always
called. So you need to be careful in the error handling that you are
not disabling a clock which does not exist....

But i think a better fix is to change ocores_i2c_of_probe() to use
devm_clk_get_enabled(), rather than devm_clk_get() so that the driver
core will disable to clock if the probe fails, or when the driver is
unloaded.

     Andrew