netdev - Re: qla3xxx: Odd likely incorrect use of test

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Message-ID: <20150513131908.GB8431@mwanda>
Date:	Wed, 13 May 2015 16:19:08 +0300
From:	Dan Carpenter <dan.carpenter@...cle.com>
To:	Joe Perches <joe@...ches.com>
Cc:	Jitendra Kalsaria <jitendra.kalsaria@...gic.com>,
	Ron Mercer <ron.mercer@...gic.com>, linux-driver@...gic.com,
	netdev <netdev@...r.kernel.org>
Subject: Re: qla3xxx: Odd likely incorrect use of test_bit in qla3xxx.c

Good eye, Joe.

I wrote a Smatch check to find similar bugs.  They weren't any other
places which tried to do bitwise OR.  The bug that happens occasionally
is:

#define MY_FLAG BIT(1)

	if (test_bit(MY_FLAG, &map)) {
		...

It's not normally harmful if it's used consistently, but ath9k had
memory corruption because they do:

	set_bit(BIT(6), &some_unsigned_long);

Anyway, I'll send patches for the bugs I found and push the Smatch
check. Thanks!

regards,
dan carpenter

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