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

[Johannes Berg <johannes@sipsolutions.net>]

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@intel.com>
> Cc: Wey-Yi Guy <wey-yi.w.guy@intel.com>
> Cc: Intel Linux Wireless <ilw@linux.intel.com>
> Cc: "John W. Linville" <linville@tuxdriver.com>
> Cc: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
> Cc: Don Fry <donald.h.fry@intel.com>
> Cc: linux-wireless@vger.kernel.org
> Cc: netdev@vger.kernel.org
> Signed-off-by: Tim Gardner <tim.gardner@canonical.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