linux-kernel - Re: [PATCH V2 wireless-next] iwlwifi: iwlagn_request_scan: Fix check for priv->scan

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Message-ID: <1354896352.9552.9.camel@jlt4.sipsolutions.net>
Date:	Fri, 07 Dec 2012 17:05:52 +0100
From:	Johannes Berg <johannes@...solutions.net>
To:	Tim Gardner <tim.gardner@...onical.com>
Cc:	linux-kernel@...r.kernel.org, Wey-Yi Guy <wey-yi.w.guy@...el.com>,
	Intel Linux Wireless <ilw@...ux.intel.com>,
	"John W. Linville" <linville@...driver.com>,
	Emmanuel Grumbach <emmanuel.grumbach@...el.com>,
	Don Fry <donald.h.fry@...el.com>,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org
Subject: Re: [PATCH V2 wireless-next] iwlwifi: iwlagn_request_scan: Fix
 check for priv->scan_request

On Fri, 2012-12-07 at 06:28 -0700, Tim Gardner wrote:
> The WARN_ON_ONCE() check for scan_request will not correctly detect
> a NULL pointer for scan_type == IWL_SCAN_NORMAL. Make it explicit
> that the check only applies to normal scans.
> 
> Convert WARN_ON_ONCE to WARN_ON since priv->scan_request really _can't_
> be NULL for normal scans. If it is then we should emit frequent warnings.
> 
> This smatch warning led to scrutiny of iwlagn_request_scan():
> 
> drivers/net/wireless/iwlwifi/dvm/scan.c:894 iwlagn_request_scan() error: we previously assumed 'priv->scan_request' could be null (see line 792)
> 
> Cc: Johannes Berg <johannes.berg@...el.com>
> Cc: Wey-Yi Guy <wey-yi.w.guy@...el.com>
> Cc: Intel Linux Wireless <ilw@...ux.intel.com>
> Cc: "John W. Linville" <linville@...driver.com>
> Cc: Emmanuel Grumbach <emmanuel.grumbach@...el.com>
> Cc: Don Fry <donald.h.fry@...el.com>
> Cc: linux-wireless@...r.kernel.org
> Cc: netdev@...r.kernel.org
> Signed-off-by: Tim Gardner <tim.gardner@...onical.com>
> ---
> 
> This patch does apply to 3.6.y, but it doesn't fix an existing
> bug so I don't think it qualifies. This patch simply makes
> the driver more robust for future development.
> 
> V2 - corrected indentation more like the rest of the source
> in this file.

Thanks, I've picked it up now, adding one space in the condition
still :)
It's in my internal tree for now, so it'll be a few days until it
trickles out to iwlwifi-next.

johannes

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