From: nbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>
Date: Wed, 20 Oct 2010 14:01:53 +0000 (+0000)
Subject: ath9k: fix a crash that happens when survey stats are accessed before the interface... 
X-Git-Url: https://git.rohieb.name/openwrt.git/commitdiff_plain/bcb63b9e02655fcf61541edfd053780fce0c67dd

ath9k: fix a crash that happens when survey stats are accessed before the interface is brought up for the first time

git-svn-id: svn://svn.openwrt.org/openwrt/trunk@23549 3c298f89-4303-0410-b956-a3cf2f4a3e73
---

diff --git a/package/mac80211/patches/540-ath9k_fix_survey_crash.patch b/package/mac80211/patches/540-ath9k_fix_survey_crash.patch
new file mode 100644
index 000000000..b627f8f4a
--- /dev/null
+++ b/package/mac80211/patches/540-ath9k_fix_survey_crash.patch
@@ -0,0 +1,12 @@
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -183,6 +183,9 @@ static void ath_update_survey_stats(stru
+ 	struct ath_cycle_counters *cc = &common->cc_survey;
+ 	unsigned int div = common->clockrate * 1000;
+ 
++	if (!ah->curchan)
++		return;
++
+ 	if (ah->power_mode == ATH9K_PM_AWAKE)
+ 		ath_hw_cycle_counters_update(common);
+