linux-kernel - Re: [PATCH] nl80211: avoid "wdev

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Message-ID: <51094F10.60605@wwwdotorg.org>
Date:	Wed, 30 Jan 2013 09:49:20 -0700
From:	Stephen Warren <swarren@...dotorg.org>
To:	Johannes Berg <johannes@...solutions.net>
CC:	"John W. Linville" <linville@...driver.com>,
	"David S. Miller" <davem@...emloft.net>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, Stephen Warren <swarren@...dia.com>
Subject: Re: [PATCH] nl80211: avoid "wdev_id may be used uninitialized"

On 01/30/2013 12:57 AM, Johannes Berg wrote:
> On Tue, 2013-01-29 at 17:11 -0700, Stephen Warren wrote:
>> From: Stephen Warren <swarren@...dia.com>
>>
>> Silence the following:
>> net/wireless/nl80211.c: In function '__cfg80211_wdev_from_attrs.clone.119':
>> net/wireless/nl80211.c:57:6: warning: 'wdev_id' may be used uninitialized in this function
>>
>> ... by always initializing wdev_id to zero. I assume that wiphy_idx and
>> ifidx are set to -1 for similar reasons, so this change simply propagates
>> the same workaround.
>>
>> In practice, this warning is false, since wdev_id is both set and used
>> under the condition if (have_wdev_id). However, at least my compiler
>> can't be coerced into realizing this; almost any code between the if
>> blocks that set and use the variable causes this warning.
> 
> I don't see this warning? What compiler are you using?

I'm using gcc-4.5.3 for ARM. I checked with gcc-4.6.3 and gcc-4.7.2 and
indeed I don't see the warning there.

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