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

From: Tim Gardner
Date: Fri Dec 07 2012 - 08:29:04 EST

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

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.

drivers/net/wireless/iwlwifi/dvm/scan.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/net/wireless/iwlwifi/dvm/scan.c b/drivers/net/wireless/iwlwifi/dvm/scan.c
index bb9f625..fe91c5a 100644
--- a/drivers/net/wireless/iwlwifi/dvm/scan.c
+++ b/drivers/net/wireless/iwlwifi/dvm/scan.c
@@ -673,8 +673,9 @@ static int iwlagn_request_scan(struct iwl_priv *priv, struct ieee80211_vif *vif)
const u8 *ssid = NULL;
u8 ssid_len = 0;

- if (WARN_ON_ONCE(priv->scan_request &&
- priv->scan_request->n_channels > MAX_SCAN_CHANNEL))
+ if (WARN_ON(priv->scan_type == IWL_SCAN_NORMAL &&
+ (!priv->scan_request ||
+ priv->scan_request->n_channels > MAX_SCAN_CHANNEL)))
return -EINVAL;


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