linux-kernel - Re: [PATCH] video:uvesafb: notice user when we failed to save hardware state

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Date:	Wed, 21 Mar 2012 18:35:51 +0000
From:	Florian Tobias Schandinat <FlorianSchandinat@....de>
To:	Wang YanQing <Udknight@...il.com>, spock@...too.org,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] video:uvesafb: notice user when we failed to save hardware
 state

On 03/02/2012 01:45 AM, Wang YanQing wrote:
> 
> uvesafb_open may failed to save hardware state when kmalloc failed
> in uvesafb_vbe_state_save, we should check this and notice user.
> 
> Signed-off-by: Wang YanQing <udknight@...il.com>

Applied.


Thanks,

Florian Tobias Schandinat

> ---
>  drivers/video/uvesafb.c |   14 +++++++++++---
>  1 file changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/video/uvesafb.c b/drivers/video/uvesafb.c
> index e7f69ef..9db3de3 100644
> --- a/drivers/video/uvesafb.c
> +++ b/drivers/video/uvesafb.c
> @@ -362,7 +362,7 @@ static u8 *uvesafb_vbe_state_save(struct uvesafb_par *par)
>  
>  	state = kmalloc(par->vbe_state_size, GFP_KERNEL);
>  	if (!state)
> -		return NULL;
> +		return ERR_PTR(-ENOMEM);
>  
>  	task = uvesafb_prep();
>  	if (!task) {
> @@ -1172,9 +1172,17 @@ static int uvesafb_open(struct fb_info *info, int user)
>  {
>  	struct uvesafb_par *par = info->par;
>  	int cnt = atomic_read(&par->ref_count);
> +	u8 *buf = NULL;
>  
> -	if (!cnt && par->vbe_state_size)
> -		par->vbe_state_orig = uvesafb_vbe_state_save(par);
> +	if (!cnt && par->vbe_state_size) {
> +		buf =  uvesafb_vbe_state_save(par);
> +		if (IS_ERR(buf)) {
> +			printk(KERN_WARNING "uvesafb: save hardware state"
> +				"failed, error code is %ld!\n", PTR_ERR(buf));
> +		} else {
> +			par->vbe_state_orig = buf;
> +		}
> +	}
>  
>  	atomic_inc(&par->ref_count);
>  	return 0;

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