Re: [PATCH -mm] idetape gcc 4.1 warning fix

[Jakub Jelinek <jakub@redhat.com>]

On Tue, May 09, 2006 at 07:55:58PM -0700, Daniel Walker wrote:
> Fixes the following warning,
> 
> drivers/ide/ide-tape.c: In function â??idetape_copy_stage_from_userâ??:
> drivers/ide/ide-tape.c:2662: warning: ignoring return value of â??copy_from_userâ??, declared with attribute warn_unused_result
> drivers/ide/ide-tape.c: In function â??idetape_copy_stage_to_userâ??:
> drivers/ide/ide-tape.c:2689: warning: ignoring return value of â??copy_to_userâ??, declared with attribute warn_unused_result
> 
> Signed-Off-By: Daniel Walker <dwalker@mvista.com>
> 
> Index: linux-2.6.16/drivers/ide/ide-tape.c
> ===================================================================
> --- linux-2.6.16.orig/drivers/ide/ide-tape.c
> +++ linux-2.6.16/drivers/ide/ide-tape.c
> @@ -2659,7 +2659,7 @@ static void idetape_copy_stage_from_user
>  		}
>  #endif /* IDETAPE_DEBUG_BUGS */
>  		count = min((unsigned int)(bh->b_size - atomic_read(&bh->b_count)), (unsigned int)n);
> -		copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count);
> +		WARN_ON(copy_from_user(bh->b_data + atomic_read(&bh->b_count), buf, count));

WARN_ON is certainly not a good way to hide this warning.
Having a user-triggerable WARN_ON is a bad idea.
Instead you should add some error handling.

	Jakub
-
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