linux-kernel - Re: [PATCH 1/2] [media] media-device: check before unregister if mdev was registered

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Date:	Thu, 10 Sep 2015 20:15:20 +0300
From:	Sakari Ailus <sakari.ailus@...ux.intel.com>
To:	Javier Martinez Canillas <javier@....samsung.com>,
	linux-kernel@...r.kernel.org
Cc:	Mauro Carvalho Chehab <mchehab@....samsung.com>,
	linux-media@...r.kernel.org
Subject: Re: [PATCH 1/2] [media] media-device: check before unregister if mdev
 was registered

Javier Martinez Canillas wrote:
> Most media functions that unregister, check if the corresponding register
> function succeed before. So these functions can safely be called even if a
> registration was never made or the component as already been unregistered.
> 
> Add the same check to media_device_unregister() function for consistency.
> 
> This will also allow to split the media_device_register() function in an
> initialization and registration functions without the need to change the
> generic cleanup functions and error code paths for all the media drivers.
> 
> Suggested-by: Sakari Ailus <sakari.ailus@...ux.intel.com>
> Signed-off-by: Javier Martinez Canillas <javier@....samsung.com>
> ---
> 
>  drivers/media/media-device.c | 6 ++++++
>  1 file changed, 6 insertions(+)
> 
> diff --git a/drivers/media/media-device.c b/drivers/media/media-device.c
> index 1312e93ebd6e..745defb34b33 100644
> --- a/drivers/media/media-device.c
> +++ b/drivers/media/media-device.c
> @@ -574,6 +574,8 @@ EXPORT_SYMBOL_GPL(__media_device_register);
>   * media_device_unregister - unregister a media device
>   * @mdev:	The media device
>   *
> + * If the media device has never been registered this function will
> + * return immediately.

I'd say "It is safe to call this function on an unregistered (but
initialised) media device.". Up to you.

Acked-by: Sakari Ailus <sakari.ailus@...ux.intel.com>

-- 
Sakari Ailus
sakari.ailus@...ux.intel.com
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