Ath5k: flush work
Make sure that the irq is not in progress after stop. This means
two things:
- ensure the intr setting register is set by flushing posted values
- call synchronize_irq() after that
Also flush stop tx write, inform callers of the tx stop about still
pending transfers (unsuccessful stop) and finally don't wait another
3ms in ath5k_rx_stop, since ath5k_hw_stop_rx_dma ensures transfer to
be finished.
Make sure all writes will be ordered in respect to locks by mmiowb().
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Acked-by: Nick Kossifidis <mickflemm@gmail.com>
Cc: Luis R. Rodriguez <mcgrof@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/drivers/net/wireless/ath5k/base.c b/drivers/net/wireless/ath5k/base.c
index c5bf8a2..8e9afb3 100644
--- a/drivers/net/wireless/ath5k/base.c
+++ b/drivers/net/wireless/ath5k/base.c
@@ -43,7 +43,9 @@
#include <linux/version.h>
#include <linux/module.h>
#include <linux/delay.h>
+#include <linux/hardirq.h>
#include <linux/if.h>
+#include <linux/io.h>
#include <linux/netdevice.h>
#include <linux/cache.h>
#include <linux/pci.h>
@@ -1249,6 +1251,7 @@
txq->link = &ds->ds_link;
ath5k_hw_tx_start(ah, txq->qnum);
+ mmiowb();
spin_unlock_bh(&txq->lock);
return 0;
@@ -1583,7 +1586,6 @@
ath5k_hw_stop_pcu_recv(ah); /* disable PCU */
ath5k_hw_set_rx_filter(ah, 0); /* clear recv filter */
ath5k_hw_stop_rx_dma(ah); /* disable DMA engine */
- mdelay(3); /* 3ms is long enough for 1 frame */
ath5k_debug_printrxbuffs(sc, ah);
@@ -2258,6 +2260,7 @@
ret = 0;
done:
+ mmiowb();
mutex_unlock(&sc->lock);
return ret;
}
@@ -2290,6 +2293,7 @@
if (!test_bit(ATH_STAT_INVALID, sc->status)) {
ath5k_led_off(sc);
ath5k_hw_set_intr(ah, 0);
+ synchronize_irq(sc->pdev->irq);
}
ath5k_txq_cleanup(sc);
if (!test_bit(ATH_STAT_INVALID, sc->status)) {
@@ -2339,6 +2343,7 @@
}
}
ath5k_txbuf_free(sc, sc->bbuf);
+ mmiowb();
mutex_unlock(&sc->lock);
del_timer_sync(&sc->calib_tim);
@@ -2804,6 +2809,7 @@
/* XXX: assoc id is set to 0 for now, mac80211 doesn't have
* a clean way of letting us retrieve this yet. */
ath5k_hw_set_associd(ah, ah->ah_bssid, 0);
+ mmiowb();
}
if (conf->changed & IEEE80211_IFCC_BEACON &&
@@ -2992,6 +2998,7 @@
}
unlock:
+ mmiowb();
mutex_unlock(&sc->lock);
return ret;
}
@@ -3065,8 +3072,10 @@
ret = ath5k_beacon_setup(sc, sc->bbuf);
if (ret)
sc->bbuf->skb = NULL;
- else
+ else {
ath5k_beacon_config(sc);
+ mmiowb();
+ }
end:
mutex_unlock(&sc->lock);