lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

mac80211: fix deadlock with multiple interfaces

Browse Source 
The locking around ieee80211_recalc_smps is
buggy -- it cannot acquire another interface's
mutex while the iflist mutex is held because
another code path could be holding the iface
mutex and trying to acquire the iflist mutex.

But the locking is also unnecessary, we only
check "ifmgd->associated" as a bool, and don't
use the pointer (in check_mgd_smps).

Reported-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Johannes Berg
2010-10-05 10:41:47 +02:00
committed by John W. Linville
parent 6774889314
commit 025e6be220
5 changed files with 7 additions and 22 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
net/mac80211/ieee80211_i.h
View File

@ -1297,8 +1297,7 @@ u32 ieee80211_sta_get_rates(struct ieee80211_local *local,
enum ieee80211_band band);
int __ieee80211_request_smps(struct ieee80211_sub_if_data *sdata,
enum ieee80211_smps_mode smps_mode);
void ieee80211_recalc_smps(struct ieee80211_local *local,
struct ieee80211_sub_if_data *forsdata);
void ieee80211_recalc_smps(struct ieee80211_local *local);
size_t ieee80211_ie_split(const u8 *ies, size_t ielen,
const u8 *ids, int n_ids, size_t offset);