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authornbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>2009-11-07 17:40:52 +0000
committernbd <nbd@3c298f89-4303-0410-b956-a3cf2f4a3e73>2009-11-07 17:40:52 +0000
commitda02086104984438513c27ab0ff21fff81b5ea07 (patch)
treeece5f248510ff085681372e3bfd611363f2d2834
parent1fa447544a76ee4941a7861adafdc5ed24a74cb6 (diff)
b43: work around a locking issue, might fix #5996
git-svn-id: svn://svn.openwrt.org/openwrt/trunk@18338 3c298f89-4303-0410-b956-a3cf2f4a3e73
-rw-r--r--package/mac80211/patches/405-b43_locking_fix.patch23
1 files changed, 23 insertions, 0 deletions
diff --git a/package/mac80211/patches/405-b43_locking_fix.patch b/package/mac80211/patches/405-b43_locking_fix.patch
new file mode 100644
index 000000000..c90890a7a
--- /dev/null
+++ b/package/mac80211/patches/405-b43_locking_fix.patch
@@ -0,0 +1,23 @@
+Subject: [PATCH] b43: work around a locking issue in ->set_tim()
+
+ops->set_tim() must be atomic, so b43 trying to acquire a mutex leads
+to a kernel crash. This patch trades an easy to trigger crash in AP
+mode for an unlikely race condition. According to Michael, the real
+fix would be to allow set_tim() callbacks to sleep, since b43 is
+not the only driver that needs to sleep in all callbacks.
+
+Signed-off-by: Felix Fietkau <nbd@openwrt.org>
+
+--- a/drivers/net/wireless/b43/main.c
++++ b/drivers/net/wireless/b43/main.c
+@@ -4534,9 +4534,8 @@ static int b43_op_beacon_set_tim(struct
+ {
+ struct b43_wl *wl = hw_to_b43_wl(hw);
+
+- mutex_lock(&wl->mutex);
++ /* FIXME: add locking */
+ b43_update_templates(wl);
+- mutex_unlock(&wl->mutex);
+
+ return 0;
+ }