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From 1e48fb52d84ac159da93ea80f54c02cef5464f12 Mon Sep 17 00:00:00 2001
From: Stanislaw Gruszka <sgruszka@redhat.com>
Date: Tue, 17 Jan 2012 12:38:50 +0100
Subject: [PATCH 17/90] brcmsmac: fix tx queue flush infinite loop
commit f96b08a7e6f69c0f0a576554df3df5b1b519c479 upstream.
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>
Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/wireless/brcm80211/brcmsmac/main.c | 10 +++++++++-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/brcm80211/brcmsmac/main.c b/drivers/net/wireless/brcm80211/brcmsmac/main.c
index 510e9bb..453f58e 100644
--- a/drivers/net/wireless/brcm80211/brcmsmac/main.c
+++ b/drivers/net/wireless/brcm80211/brcmsmac/main.c
@@ -8217,13 +8217,21 @@ 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)
--
1.7.9.4
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