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| author | Felix Fietkau <nbd@openwrt.org> | 2014-02-22 13:00:55 +0000 |
|---|---|---|
| committer | Felix Fietkau <nbd@openwrt.org> | 2014-02-22 13:00:55 +0000 |
| commit | b44e9bff9dd2840df8353c8c4c71b26a14e5dd70 (patch) | |
| tree | 68ff41373f5dd1797ec8a4078761f17286b9cd9d | |
| parent | c1f397e1e15bc49a19e95ef4011d2827bed878c6 (diff) | |
| download | upstream-b44e9bff9dd2840df8353c8c4c71b26a14e5dd70.tar.gz upstream-b44e9bff9dd2840df8353c8c4c71b26a14e5dd70.tar.bz2 upstream-b44e9bff9dd2840df8353c8c4c71b26a14e5dd70.zip | |
ath9k: add a tx locking fix
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
SVN-Revision: 39684
| -rw-r--r-- | package/kernel/mac80211/patches/300-pending_work.patch | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/package/kernel/mac80211/patches/300-pending_work.patch b/package/kernel/mac80211/patches/300-pending_work.patch index a790183f74..be82f3704e 100644 --- a/package/kernel/mac80211/patches/300-pending_work.patch +++ b/package/kernel/mac80211/patches/300-pending_work.patch @@ -1,3 +1,43 @@ +commit a63caf0a357ad5c1f08d6b7827dc76c451445017 +Author: Stanislaw Gruszka <sgruszka@redhat.com> +Date: Wed Feb 19 13:15:17 2014 +0100 + + ath9k: protect tid->sched check + + We check tid->sched without a lock taken on ath_tx_aggr_sleep(). That + is race condition which can result of doing list_del(&tid->list) twice + (second time with poisoned list node) and cause crash like shown below: + + [424271.637220] BUG: unable to handle kernel paging request at 00100104 + [424271.637328] IP: [<f90fc072>] ath_tx_aggr_sleep+0x62/0xe0 [ath9k] + ... + [424271.639953] Call Trace: + [424271.639998] [<f90f6900>] ? ath9k_get_survey+0x110/0x110 [ath9k] + [424271.640083] [<f90f6942>] ath9k_sta_notify+0x42/0x50 [ath9k] + [424271.640177] [<f809cfef>] sta_ps_start+0x8f/0x1c0 [mac80211] + [424271.640258] [<c10f730e>] ? free_compound_page+0x2e/0x40 + [424271.640346] [<f809e915>] ieee80211_rx_handlers+0x9d5/0x2340 [mac80211] + [424271.640437] [<c112f048>] ? kmem_cache_free+0x1d8/0x1f0 + [424271.640510] [<c1345a84>] ? kfree_skbmem+0x34/0x90 + [424271.640578] [<c10fc23c>] ? put_page+0x2c/0x40 + [424271.640640] [<c1345a84>] ? kfree_skbmem+0x34/0x90 + [424271.640706] [<c1345a84>] ? kfree_skbmem+0x34/0x90 + [424271.640787] [<f809dde3>] ? ieee80211_rx_handlers_result+0x73/0x1d0 [mac80211] + [424271.640897] [<f80a07a0>] ieee80211_prepare_and_rx_handle+0x520/0xad0 [mac80211] + [424271.641009] [<f809e22d>] ? ieee80211_rx_handlers+0x2ed/0x2340 [mac80211] + [424271.641104] [<c13846ce>] ? ip_output+0x7e/0xd0 + [424271.641182] [<f80a1057>] ieee80211_rx+0x307/0x7c0 [mac80211] + [424271.641266] [<f90fa6ee>] ath_rx_tasklet+0x88e/0xf70 [ath9k] + [424271.641358] [<f80a0f2c>] ? ieee80211_rx+0x1dc/0x7c0 [mac80211] + [424271.641445] [<f90f82db>] ath9k_tasklet+0xcb/0x130 [ath9k] + + Bug report: + https://bugzilla.kernel.org/show_bug.cgi?id=70551 + + Reported-and-tested-by: Max Sydorenko <maxim.stargazer@gmail.com> + Cc: stable@vger.kernel.org + Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com> + commit 82ed9e3ccc02797df2ffe4b78127c4cd5f799a41 Author: Felix Fietkau <nbd@openwrt.org> Date: Tue Feb 11 15:54:13 2014 +0100 @@ -2732,3 +2772,25 @@ Date: Thu Jan 23 20:06:34 2014 +0100 /* use the data classifier to determine what 802.1d tag the * data frame has */ rcu_read_lock(); +--- a/drivers/net/wireless/ath/ath9k/xmit.c ++++ b/drivers/net/wireless/ath/ath9k/xmit.c +@@ -1444,14 +1444,16 @@ void ath_tx_aggr_sleep(struct ieee80211_ + for (tidno = 0, tid = &an->tid[tidno]; + tidno < IEEE80211_NUM_TIDS; tidno++, tid++) { + +- if (!tid->sched) +- continue; +- + ac = tid->ac; + txq = ac->txq; + + ath_txq_lock(sc, txq); + ++ if (!tid->sched) { ++ ath_txq_unlock(sc, txq); ++ continue; ++ } ++ + buffered = ath_tid_has_buffered(tid); + + tid->sched = false; |