[PATCH] platform/surface: dtx: Add missing mutex_destroy() call in failure path

[PATCH] platform/surface: dtx: Add missing mutex_destroy() call in failure path

[Maximilian Luz]

When we fail to open the device file due to DTX being shut down, the
mutex is initialized but never destroyed. We are destroying it when
releasing the file, so add the missing call in the failure path as well.

Fixes: 1d609992832e ("platform/surface: Add DTX driver")
Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>
---
 drivers/platform/surface/surface_dtx.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/platform/surface/surface_dtx.c b/drivers/platform/surface/surface_dtx.c
index 5d9b758a99bb..1203b9a82993 100644
--- a/drivers/platform/surface/surface_dtx.c
+++ b/drivers/platform/surface/surface_dtx.c
@@ -427,6 +427,7 @@ static int surface_dtx_open(struct inode *inode, struct file *file)
 	 */
 	if (test_bit(SDTX_DEVICE_SHUTDOWN_BIT, &ddev->flags)) {
 		up_write(&ddev->client_lock);
+		mutex_destroy(&client->read_lock);
 		sdtx_device_put(client->ddev);
 		kfree(client);
 		return -ENODEV;
-- 
2.31.1

Re: [PATCH] platform/surface: dtx: Add missing mutex_destroy() call in failure path

[Hans de Goede]

Hi,

On 6/4/21 3:25 PM, Maximilian Luz wrote:
> When we fail to open the device file due to DTX being shut down, the
> mutex is initialized but never destroyed. We are destroying it when
> releasing the file, so add the missing call in the failure path as well.
> 
> Fixes: 1d609992832e ("platform/surface: Add DTX driver")
> Signed-off-by: Maximilian Luz <luzmaximilian@gmail.com>

Thank you for your patch, I've applied this patch to my review-hans 
branch:
https://git.kernel.org/pub/scm/linux/kernel/git/pdx86/platform-drivers-x86.git/log/?h=review-hans

I'll also add this to the fixes branch, so that it gets included
in my next pull-req to Linus for 5.13.

Note it will show up in my review-hans branch once I've pushed my
local branch there, which might take a while.

Once I've run some tests on this branch the patches there will be
added to the platform-drivers-x86/for-next branch and eventually
will be included in the pdx86 pull-request to Linus for the next
merge-window.

Regards,

Hans

> ---
>  drivers/platform/surface/surface_dtx.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/platform/surface/surface_dtx.c b/drivers/platform/surface/surface_dtx.c
> index 5d9b758a99bb..1203b9a82993 100644
> --- a/drivers/platform/surface/surface_dtx.c
> +++ b/drivers/platform/surface/surface_dtx.c
> @@ -427,6 +427,7 @@ static int surface_dtx_open(struct inode *inode, struct file *file)
>  	 */
>  	if (test_bit(SDTX_DEVICE_SHUTDOWN_BIT, &ddev->flags)) {
>  		up_write(&ddev->client_lock);
> +		mutex_destroy(&client->read_lock);
>  		sdtx_device_put(client->ddev);
>  		kfree(client);
>  		return -ENODEV;
>