diff options
| author |   Igor Perminov <igor.perminov@inbox.ru> | 2009-08-08 23:55:18 +0200 |
|---|---|---|
| committer |   John W. Linville <linville@tuxdriver.com> | 2009-08-14 09:13:53 -0400 |
| commit | 17512dc3b7fc9ff1a60d3748ce87c323df507c3d (patch) | |
| tree | 1ad4c98c3c653571552156116ce639c6e0aa2789 /drivers/net/wireless/rt2x00/rt2x00mac.c | |
| parent | rt2x00: Fix rounding errors in RSSI average calculation (diff) | |
| download | linux-dev-17512dc3b7fc9ff1a60d3748ce87c323df507c3d.tar.xz linux-dev-17512dc3b7fc9ff1a60d3748ce87c323df507c3d.zip | |
rt2x00: Fix for race condition while update beacon
The patch "Implement set_tim callback for all drivers" can cause kernel
oops in rt73usb_write_beacon. The oops is caused by one of the following
race conditions:
* In case of two near calls to set_tim: rt2x00lib_beacondone_iter is
cleaning the beacon skb, whereas rt73usb_write_beacon is still using it.
* In case of two near updates of beacon: first as the result of set_tim
and second as the result of a call from an application (e.g. hostapd).
This patch fixes the race condition by rearranging the update logic and
guarding rt2x00_intf->beacon->skb with a mutex.
Signed-off-by: Igor Perminov <igor.perminov@inbox.ru>
Signed-off-by: Ivo van Doorn <IvDoorn@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net/wireless/rt2x00/rt2x00mac.c')
| -rw-r--r-- | drivers/net/wireless/rt2x00/rt2x00mac.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/net/wireless/rt2x00/rt2x00mac.c b/drivers/net/wireless/rt2x00/rt2x00mac.c index 4164fce05987..74451f9672d9 100644 --- a/drivers/net/wireless/rt2x00/rt2x00mac.c +++ b/drivers/net/wireless/rt2x00/rt2x00mac.c @@ -274,6 +274,7 @@ int rt2x00mac_add_interface(struct ieee80211_hw *hw, spin_lock_init(&intf->lock); spin_lock_init(&intf->seqlock); + mutex_init(&intf->beacon_skb_mutex); intf->beacon = entry; if (conf->type == NL80211_IFTYPE_AP) |