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Message-Id: <1354886914-7822-1-git-send-email-tim.gardner@canonical.com> Date: Fri, 7 Dec 2012 06:28:34 -0700 From: Tim Gardner <tim.gardner@...onical.com> To: linux-kernel@...r.kernel.org Cc: Tim Gardner <tim.gardner@...onical.com>, Johannes Berg <johannes.berg@...el.com>, 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: [PATCH V2 wireless-next] iwlwifi: iwlagn_request_scan: Fix check for priv->scan_request 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. 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; lockdep_assert_held(&priv->mutex); -- 1.7.9.5 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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