linux-kernel - Re: [PATCH] staging: sm750fb: fix sparse warning for lock

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Message-ID: <20150805223455.GD5180@mwanda>
Date:	Thu, 6 Aug 2015 01:34:55 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Peng Fan <van.freenix@...il.com>
Cc:	sudipm.mukherjee@...il.com, teddy.wang@...iconmotion.com,
	gregkh@...uxfoundation.org, devel@...verdev.osuosl.org,
	linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: sm750fb: fix sparse warning for lock

On Wed, Aug 05, 2015 at 09:26:44PM +0800, Peng Fan wrote:
> Use __acquire() and __release() in the right place to silence the sparse
> lock checking warning.
> 
> drivers/staging/sm750fb/sm750.c:177:13: warning: context imbalance in 'lynxfb_ops_fillrect' - different lock contexts for basic block
> drivers/staging/sm750fb/sm750.c:243:9: warning: context imbalance in 'lynxfb_ops_copyarea' - different lock contexts for basic block
> drivers/staging/sm750fb/sm750.c:247:13: warning: context imbalance in 'lynxfb_ops_imageblit' - different lock contexts for basic block
> 

Sparse is really bad at locking stuff.  Smatch is also really bad for
locking and I have been promising to re-write that check for years, but
I take comfort always in the fact that at least it's not as bad as
Sparse.

You should pretty much ignore Sparse locking warnings.

regards,
dan carpenter

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