linux-kernel - Re: [PATCH 31/31] media: au0828 change to check media device unregister progress state

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Date:	Thu, 28 Jan 2016 15:05:38 -0200
From:	Mauro Carvalho Chehab <mchehab@....samsung.com>
To:	Shuah Khan <shuahkh@....samsung.com>
Cc:	tiwai@...e.com, clemens@...isch.de, hans.verkuil@...co.com,
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Subject: Re: [PATCH 31/31] media: au0828 change to check media device
 unregister progress state

Em Wed,  6 Jan 2016 13:27:20 -0700
Shuah Khan <shuahkh@....samsung.com> escreveu:

> Change au0828_unregister_media_device() to check media
> device media device unregister is in progress and avoid
> calling media_device_unregister() and other cleanup done
> in au0828_unregister_media_device().
> 
> Signed-off-by: Shuah Khan <shuahkh@....samsung.com>
> ---
>  drivers/media/usb/au0828/au0828-core.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/media/usb/au0828/au0828-core.c b/drivers/media/usb/au0828/au0828-core.c
> index 886fb28..de357a2 100644
> --- a/drivers/media/usb/au0828/au0828-core.c
> +++ b/drivers/media/usb/au0828/au0828-core.c
> @@ -136,7 +136,9 @@ static void au0828_unregister_media_device(struct au0828_dev *dev)
>  
>  #ifdef CONFIG_MEDIA_CONTROLLER
>  	if (dev->media_dev &&
> -		media_devnode_is_registered(&dev->media_dev->devnode)) {
> +		media_devnode_is_registered(&dev->media_dev->devnode) &&
> +		!media_device_is_unregister_in_progress(dev->media_dev)) {
> +

A kref would likely work better here.

>  		media_device_unregister(dev->media_dev);
>  		media_device_cleanup(dev->media_dev);
>  		dev->media_dev = NULL;