linux-kernel - Re: [PATCH] video: Fix return value of fb_notifier_call

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Date:	Mon, 21 Nov 2011 23:08:32 +0000
From:	Florian Tobias Schandinat <FlorianSchandinat@....de>
To:	Joonyoung Shim <jy0922.shim@...sung.com>
CC:	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] video: Fix return value of fb_notifier_call_chain

On 11/21/2011 06:55 AM, Joonyoung Shim wrote:
> The return value of blocking_notifier_call_chain isn't errno value, it
> is just notify return value. The ret of fb_notifier_call_chain should is
> restored to error value from notify return value using
> notifier_to_errno().

If I'm not wrong this patch would rather break things than fix them. As I
understand the notifier_calls would be required to encode the return value with
notifier_from_errno. This does not happen at the moment for fb clients, for
example fbcon_event_notify in drivers/video/console/fbcon.c, so this patch would
screw up the return values, I think.


Best regards,

Florian Tobias Schandinat

> Signed-off-by: Joonyoung Shim <jy0922.shim@...sung.com>
> ---
>  drivers/video/fb_notify.c |    4 +++-
>  1 files changed, 3 insertions(+), 1 deletions(-)
> 
> diff --git a/drivers/video/fb_notify.c b/drivers/video/fb_notify.c
> index 74c2da5..49a64a3 100644
> --- a/drivers/video/fb_notify.c
> +++ b/drivers/video/fb_notify.c
> @@ -42,6 +42,8 @@ EXPORT_SYMBOL(fb_unregister_client);
>   */
>  int fb_notifier_call_chain(unsigned long val, void *v)
>  {
> -	return blocking_notifier_call_chain(&fb_notifier_list, val, v);
> +	int ret = blocking_notifier_call_chain(&fb_notifier_list, val, v);
> +
> +	return notifier_to_errno(ret);
>  }
>  EXPORT_SYMBOL_GPL(fb_notifier_call_chain);

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