brcm80211: smac: fix endless retry of A-MPDU transmissions

commit 5e379203c7788b7af01150bfadbc74d2797a2ef4 upstream.

The A-MPDU code checked against a retry limit, but it was using
the wrong variable to do so. This patch fixes this to assure
proper retry mechanism.

This problem had a side-effect causing the mac80211 flush callback
to remain waiting forever as well. That side effect has been fixed
by commit by Stanislaw Gruszka:

commit f96b08a7e6f69c0f0a576554df3df5b1b519c479
Date:   Tue Jan 17 12:38:50 2012 +0100

    brcmsmac: fix tx queue flush infinite loop

    Reference:
    https://bugzilla.kernel.org/show_bug.cgi?id=42576

Cc: Stanislaw Gruszka <sgruszka@redhat.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Reviewed-by: Alwin Beukers <alwin@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/net/wireless/brcm80211/brcmsmac/ampdu.c b/drivers/net/wireless/brcm80211/brcmsmac/ampdu.c
index 7f27dbd..0515862 100644 (file)
--- a/drivers/net/wireless/brcm80211/brcmsmac/ampdu.c
+++ b/drivers/net/wireless/brcm80211/brcmsmac/ampdu.c
@@ -1053,17 +1053,13 @@ brcms_c_ampdu_dotxstatus_complete(struct ampdu_info *ampdu, struct scb *scb,
                }
                /* either retransmit or send bar if ack not recd */
                if (!ack_recd) {
-                       struct ieee80211_tx_rate *txrate =
-                           tx_info->status.rates;
-                       if (retry && (txrate[0].count < (int)retry_limit)) {
+                       if (retry && (ini->txretry[index] < (int)retry_limit)) {
                                ini->txretry[index]++;
                                ini->tx_in_transit--;
                                /*
                                 * Use high prededence for retransmit to
                                 * give some punch
                                 */
-                               /* brcms_c_txq_enq(wlc, scb, p,
-                                * BRCMS_PRIO_TO_PREC(tid)); */
                                brcms_c_txq_enq(wlc, scb, p,
                                                BRCMS_PRIO_TO_HI_PREC(tid));
                        } else {