diff options
| author | Stanislaw Gruszka <sgruszka@redhat.com> | 2012-01-17 12:38:50 +0100 |
|---|---|---|
| committer | John W. Linville <linville@tuxdriver.com> | 2012-01-18 20:38:05 +0100 |
| commit | f96b08a7e6f69c0f0a576554df3df5b1b519c479 (patch) | |
| tree | 6013abd195471946694eef64cbd927635e44182b /drivers/net | |
| parent | mac80211: fix debugfs key->station symlink (diff) | |
| download | linux-f96b08a7e6f69c0f0a576554df3df5b1b519c479.tar.xz linux-f96b08a7e6f69c0f0a576554df3df5b1b519c479.zip | |
brcmsmac: fix tx queue flush infinite loop
This patch workaround live deadlock problem caused by infinite loop
in brcms_c_wait_for_tx_completion(). I do not consider the patch as
the proper fix, which should fix the real reason of tx queue flush
failure, but patch helps with system lockup.
Reference:
https://bugzilla.kernel.org/show_bug.cgi?id=42576
Reported-and-tested-by: Patrick <ragamuffin@datacomm.ch>
Cc: stable@vger.kernel.org # 3.2+
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'drivers/net')
| -rw-r--r-- | drivers/net/wireless/brcm80211/brcmsmac/main.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/net/wireless/brcm80211/brcmsmac/main.c b/drivers/net/wireless/brcm80211/brcmsmac/main.c index f7ed34034f88..f6affc6fd12a 100644 --- a/drivers/net/wireless/brcm80211/brcmsmac/main.c +++ b/drivers/net/wireless/brcm80211/brcmsmac/main.c @@ -7981,13 +7981,21 @@ int brcms_c_get_curband(struct brcms_c_info *wlc) void brcms_c_wait_for_tx_completion(struct brcms_c_info *wlc, bool drop) { + int timeout = 20; + /* flush packet queue when requested */ if (drop) brcmu_pktq_flush(&wlc->pkt_queue->q, false, NULL, NULL); /* wait for queue and DMA fifos to run dry */ - while (!pktq_empty(&wlc->pkt_queue->q) || brcms_txpktpendtot(wlc) > 0) + while (!pktq_empty(&wlc->pkt_queue->q) || brcms_txpktpendtot(wlc) > 0) { brcms_msleep(wlc->wl, 1); + + if (--timeout == 0) + break; + } + + WARN_ON_ONCE(timeout == 0); } void brcms_c_set_beacon_listen_interval(struct brcms_c_info *wlc, u8 interval) |