linux-kernel - Re: [PATCH v3] media: uvcvideo: avoid variable shadowing in uvc_ctrl_cleanup

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Message-ID: <cd399cfa-92b6-427c-a4fb-e11364ae57dc@kernel.org>
Date: Mon, 21 Jul 2025 14:11:07 +0200
From: Hans de Goede <hansg@...nel.org>
To: Laurent Pinchart <laurent.pinchart@...asonboard.com>,
 Desnes Nunes <desnesn@...hat.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
 stable@...nel.org
Subject: Re: [PATCH v3] media: uvcvideo: avoid variable shadowing in
 uvc_ctrl_cleanup_fh

Hi,

On 8-Jul-25 6:43 PM, Laurent Pinchart wrote:
> Hi Desnes,
> 
> Thank you for the patch.
> 
> On Tue, Jul 08, 2025 at 11:46:28AM -0300, Desnes Nunes wrote:
>> This avoids a variable loop shadowing occurring between the local loop
>> iterating through the uvc_entity's controls and the global one going
>> through the pending async controls of the file handle
> 
> s/handle/handle./
> 
> (easily handled when applying the patch, no need to resend)
> 
>> Cc: stable@...nel.org
>> Fixes: 10acb9101355 ("media: uvcvideo: Increase/decrease the PM counter per IOCTL")
> 
> I think CI will ask for Cc to go after Fixes. If so that can also be
> handled when applying.
> 
>> Signed-off-by: Desnes Nunes <desnesn@...hat.com>
> 
> Reviewed-by: Laurent Pinchart <laurent.pinchart@...asonboard.com>

Thank you both for the patch and review. I've amended the commit
message while applying as suggested by Laurent and I have merged
this into:

https://gitlab.freedesktop.org/linux-media/users/uvc/-/commits/for-next/

Regards,

Hans





>> ---
>>  drivers/media/usb/uvc/uvc_ctrl.c | 3 +--
>>  1 file changed, 1 insertion(+), 2 deletions(-)
>>
>> diff --git a/drivers/media/usb/uvc/uvc_ctrl.c b/drivers/media/usb/uvc/uvc_ctrl.c
>> index 303b7509ec47..6b9486749c3f 100644
>> --- a/drivers/media/usb/uvc/uvc_ctrl.c
>> +++ b/drivers/media/usb/uvc/uvc_ctrl.c
>> @@ -3299,7 +3299,6 @@ int uvc_ctrl_init_device(struct uvc_device *dev)
>>  void uvc_ctrl_cleanup_fh(struct uvc_fh *handle)
>>  {
>>  	struct uvc_entity *entity;
>> -	int i;
>>  
>>  	guard(mutex)(&handle->chain->ctrl_mutex);
>>  
>> @@ -3317,7 +3316,7 @@ void uvc_ctrl_cleanup_fh(struct uvc_fh *handle)
>>  	if (!WARN_ON(handle->pending_async_ctrls))
>>  		return;
>>  
>> -	for (i = 0; i < handle->pending_async_ctrls; i++)
>> +	for (unsigned int i = 0; i < handle->pending_async_ctrls; i++)
>>  		uvc_pm_put(handle->stream->dev);
>>  }
>>  
>