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

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Message-ID: <1359532679.8010.1.camel@jlt4.sipsolutions.net>
Date:	Wed, 30 Jan 2013 08:57:59 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Stephen Warren <swarren@...dotorg.org>
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 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?

johannes

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