52 lines
1.7 KiB
Diff
52 lines
1.7 KiB
Diff
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From f96b08a7e6f69c0f0a576554df3df5b1b519c479 Mon Sep 17 00:00:00 2001
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From: Stanislaw Gruszka <sgruszka@redhat.com>
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Date: Tue, 17 Jan 2012 12:38:50 +0100
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Subject: [PATCH 2/8] brcmsmac: fix tx queue flush infinite loop
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This patch workaround live deadlock problem caused by infinite loop
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in brcms_c_wait_for_tx_completion(). I do not consider the patch as
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the proper fix, which should fix the real reason of tx queue flush
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failure, but patch helps with system lockup.
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Reference:
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https://bugzilla.kernel.org/show_bug.cgi?id=42576
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Reported-and-tested-by: Patrick <ragamuffin@datacomm.ch>
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Cc: stable@vger.kernel.org # 3.2+
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Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
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Signed-off-by: John W. Linville <linville@tuxdriver.com>
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---
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drivers/net/wireless/brcm80211/brcmsmac/main.c | 10 +++++++++-
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1 files changed, 9 insertions(+), 1 deletions(-)
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diff --git a/drivers/net/wireless/brcm80211/brcmsmac/main.c b/drivers/net/wireless/brcm80211/brcmsmac/main.c
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index f7ed340..f6affc6 100644
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--- a/drivers/net/wireless/brcm80211/brcmsmac/main.c
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+++ b/drivers/net/wireless/brcm80211/brcmsmac/main.c
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@@ -7981,13 +7981,21 @@ int brcms_c_get_curband(struct brcms_c_info *wlc)
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void brcms_c_wait_for_tx_completion(struct brcms_c_info *wlc, bool drop)
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{
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+ int timeout = 20;
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+
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/* flush packet queue when requested */
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if (drop)
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brcmu_pktq_flush(&wlc->pkt_queue->q, false, NULL, NULL);
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/* wait for queue and DMA fifos to run dry */
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- while (!pktq_empty(&wlc->pkt_queue->q) || brcms_txpktpendtot(wlc) > 0)
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+ while (!pktq_empty(&wlc->pkt_queue->q) || brcms_txpktpendtot(wlc) > 0) {
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brcms_msleep(wlc->wl, 1);
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+
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+ if (--timeout == 0)
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+ break;
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+ }
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+
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+ WARN_ON_ONCE(timeout == 0);
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}
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void brcms_c_set_beacon_listen_interval(struct brcms_c_info *wlc, u8 interval)
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--
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1.7.4.4
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