ACK: [B/D/E][SRU][PATCH 1/1] media: vimc: fix component match compare

[Colin Ian King]

On 14/08/2019 09:48, Po-Hsu Lin wrote:
> From: Helen Koike <helen.koike at collabora.com>
> 
> BugLink: https://bugs.launchpad.net/bugs/1840028
> 
> If the system has other devices being registered in the component
> framework, the compare function will be called with a device that
> doesn't belong to vimc.
> This device is not necessarily a platform_device, nor have a
> platform_data (which causes a NULL pointer dereference error) and if it
> does have a pdata, it is not necessarily type of struct vimc_platform_data.
> So casting to any of these types is wrong.
> 
> Instead of expecting a given pdev with a given pdata, just expect for
> the device it self. vimc-core is the one who creates them, we know in
> advance exactly which object to expect in the match.
> 
> Fixes: 4a29b7090749 ("[media] vimc: Subdevices as modules")
> 
> Signed-off-by: Helen Koike <helen.koike at collabora.com>
> Reviewed-by: Boris Brezillon <boris.brezillon at collabora.com>
> Tested-by: Boris Brezillon <boris.brezillon at collabora.com>
> Signed-off-by: Hans Verkuil <hverkuil-cisco at xs4all.nl>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+samsung at kernel.org>
> (cherry picked from commit ee1c71a8e1456ab53fe667281d855849edf26a4d)
> Signed-off-by: Po-Hsu Lin <po-hsu.lin at canonical.com>
> ---
>  drivers/media/platform/vimc/vimc-core.c | 7 ++-----
>  1 file changed, 2 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/media/platform/vimc/vimc-core.c b/drivers/media/platform/vimc/vimc-core.c
> index 64eb424..b48813e 100644
> --- a/drivers/media/platform/vimc/vimc-core.c
> +++ b/drivers/media/platform/vimc/vimc-core.c
> @@ -243,10 +243,7 @@ static void vimc_comp_unbind(struct device *master)
>  
>  static int vimc_comp_compare(struct device *comp, void *data)
>  {
> -	const struct platform_device *pdev = to_platform_device(comp);
> -	const char *name = data;
> -
> -	return !strcmp(pdev->dev.platform_data, name);
> +	return comp == data;
>  }
>  
>  static struct component_match *vimc_add_subdevs(struct vimc_device *vimc)
> @@ -276,7 +273,7 @@ static struct component_match *vimc_add_subdevs(struct vimc_device *vimc)
>  		}
>  
>  		component_match_add(&vimc->pdev.dev, &match, vimc_comp_compare,
> -				    (void *)vimc->pipe_cfg->ents[i].name);
> +				    &vimc->subdevs[i]->dev);
>  	}
>  
>  	return match;
> 
Clean cherry pick

Acked-by: Colin Ian King <colin.king at canonical.com>