linux-kernel - Re: + bluetooth-fix-warning-in-net-bluetooth-hci

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Message-Id: <20080216015442.e94dc0ca.akpm@linux-foundation.org>
Date:	Sat, 16 Feb 2008 01:54:42 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	David Miller <davem@...emloft.net>
Cc:	linux-kernel@...r.kernel.org, hidave.darkstar@...il.com
Subject: Re: + bluetooth-fix-warning-in-net-bluetooth-hci_sysfsc.patch added
 to -mm tree

On Sat, 16 Feb 2008 01:27:41 -0800 (PST) David Miller <davem@...emloft.net> wrote:

> From: akpm@...ux-foundation.org
> Date: Fri, 15 Feb 2008 20:49:33 -0800
> 
> > Subject: bluetooth: fix warning in net/bluetooth/hci_sysfs.c
> > From: Andrew Morton <akpm@...ux-foundation.org>
> > 
> > net/bluetooth/hci_sysfs.c: In function 'del_conn':
> > net/bluetooth/hci_sysfs.c:339: warning: suggest parentheses around assignment used as truth value
> > 
> > Cc: Dave Young <hidave.darkstar@...il.com>
> > Cc: David S. Miller <davem@...emloft.net>
> > Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
> 
> Linus barfed when this exact patch got posted a few weeks
> ago, he said he considers just adding parenthesis to quiet
> this warning awful and explicit NULL test should be used.

-	while (dev = device_find_child(&conn->dev, NULL, __match_tty)) {
+	while ((dev = device_find_child(&conn->dev, NULL, __match_tty))) {

hrm.

box:/usr/src/linux-2.6.25-rc2> grep -r 'while [(][(].*{$' . | wc -l               
1240
box:/usr/src/linux-2.6.25-rc2> grep -r 'while [(][(].*{$' . | grep -v NULL | wc -l
867

so two thirds of them presently don't bother testing for NULL.  It's a
pretty common idiom.

(adds the != NULL, sees that it reaches column 82, drops patch in disgust)
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