linux-kernel - Re: [PATCH v2 2/2] net/mlx4_core: clean up srq_res_start_move

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Message-Id: <20140116.160517.1449593192794233083.davem@davemloft.net>
Date:	Thu, 16 Jan 2014 16:05:17 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	pebolle@...cali.nl
Cc:	ogerlitz@...lanox.com, jackm@....mellanox.co.il,
	ronye@...lanox.com, hadarh@...lanox.com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 2/2] net/mlx4_core: clean up srq_res_start_move_to()

From: Paul Bolle <pebolle@...cali.nl>
Date: Tue, 14 Jan 2014 20:46:52 +0100

> Building resource_tracker.o triggers a GCC warning:
>     drivers/net/ethernet/mellanox/mlx4/resource_tracker.c: In function 'mlx4_HW2SW_SRQ_wrapper':
>     drivers/net/ethernet/mellanox/mlx4/resource_tracker.c:3202:17: warning: 'srq' may be used uninitialized in this function [-Wmaybe-uninitialized]
>       atomic_dec(&srq->mtt->ref_count);
>                      ^
> 
> This is a false positive. But a cleanup of srq_res_start_move_to() can
> help GCC here. The code currently uses a switch statement where a plain
> if/else would do, since only two of the switch's four cases can ever
> occur. Dropping that switch makes the warning go away.
> 
> While we're at it, add some missing braces, and convert state to the
> correct type.
> 
> Signed-off-by: Paul Bolle <pebolle@...cali.nl>

Applied.
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