Subject: Re: [PATCH] cxgb3: Fix __must_check warning with dev_dbg.

From: Chris Snook <[email-masked]>
Date: Wed, 02 Apr 2008 11:49:25 -0400

Dan Noe wrote:
> Fix the warning:
> drivers/net/cxgb3/cxgb3_main.c: In function ‘offload_open’:
> drivers/net/cxgb3/cxgb3_main.c:936: warning: ignoring return value of
>  ‘sysfs_create_group’, declared with attribute warn_unused_result
> 
> Now the return value is checked; if sysfs_create_group() returns failure,
> a warning is printed using dev_dbg, and the code continues as before.  Use
> of dev_dbg ensures printk is not needlessly included unless desired for
> debugging.
> 
> Signed-off-by: Dan Noe <[email-masked]>
> ---
>  drivers/net/cxgb3/cxgb3_main.c |    4 ++--
>  1 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/cxgb3/cxgb3_main.c b/drivers/net/cxgb3/cxgb3_main.c
> index fd2e05b..0ddc34a 100644
> --- a/drivers/net/cxgb3/cxgb3_main.c
> +++ b/drivers/net/cxgb3/cxgb3_main.c
> @@ -1014,8 +1014,8 @@ static int offload_open(struct net_device *dev)
>  		     adapter->port[0]->mtu : 0xffff);
>  	init_smt(adapter);
>  
> -	/* Never mind if the next step fails */
> -	sysfs_create_group(&tdev->lldev->dev.kobj, &offload_attr_group);
> +	if (sysfs_create_group(&tdev->lldev->dev.kobj, &offload_attr_group))
> +		dev_dbg(&dev->dev, ": cannot create sysfs group\n");
>  
>  	/* Call back all registered clients */
>  	cxgb3_add_clients(tdev);

Close.  dev_dbg() invokes dev_printk(), which provides the ": ", so you 
can take those two characters out of the string literal.

-- Chris