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Date: Tue, 15 Jul 2008 17:44:20 +0200
From: Jiri Slaby <jirislaby@...il.com>
To: linville@...driver.com
Cc: linux-wireless@...r.kernel.org, linux-kernel@...r.kernel.org,
Jiri Slaby <jirislaby@...il.com>,
Nick Kossifidis <mickflemm@...il.com>,
"Luis R. Rodriguez" <mcgrof@...il.com>
Subject: [PATCH 3/5] 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@...il.com>
Cc: Nick Kossifidis <mickflemm@...il.com>
Cc: Luis R. Rodriguez <mcgrof@...il.com>
---
drivers/net/wireless/ath5k/base.c | 13 +++++++++++--
drivers/net/wireless/ath5k/hw.c | 4 ++++
2 files changed, 15 insertions(+), 2 deletions(-)
diff --git a/drivers/net/wireless/ath5k/base.c b/drivers/net/wireless/ath5k/base.c
index 4d9ff97..4874a6f 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>
@@ -1250,6 +1252,7 @@ ath5k_txbuf_setup(struct ath5k_softc *sc, struct ath5k_buf *bf)
txq->link = &ds->ds_link;
ath5k_hw_tx_start(ah, txq->qnum);
+ mmiowb();
spin_unlock_bh(&txq->lock);
return 0;
@@ -1584,7 +1587,6 @@ ath5k_rx_stop(struct ath5k_softc *sc)
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);
@@ -2259,6 +2261,7 @@ ath5k_init(struct ath5k_softc *sc)
ret = 0;
done:
+ mmiowb();
mutex_unlock(&sc->lock);
return ret;
}
@@ -2291,6 +2294,7 @@ ath5k_stop_locked(struct ath5k_softc *sc)
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)) {
@@ -2340,6 +2344,7 @@ ath5k_stop_hw(struct ath5k_softc *sc)
}
}
ath5k_txbuf_free(sc, sc->bbuf);
+ mmiowb();
mutex_unlock(&sc->lock);
del_timer_sync(&sc->calib_tim);
@@ -2805,6 +2810,7 @@ ath5k_config_interface(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
/* 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();
}
mutex_unlock(&sc->lock);
@@ -2981,6 +2987,7 @@ ath5k_set_key(struct ieee80211_hw *hw, enum set_key_cmd cmd,
}
unlock:
+ mmiowb();
mutex_unlock(&sc->lock);
return ret;
}
@@ -3054,8 +3061,10 @@ ath5k_beacon_update(struct ieee80211_hw *hw, struct sk_buff *skb)
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);
diff --git a/drivers/net/wireless/ath5k/hw.c b/drivers/net/wireless/ath5k/hw.c
index c6d12c5..7ca87a5 100644
--- a/drivers/net/wireless/ath5k/hw.c
+++ b/drivers/net/wireless/ath5k/hw.c
@@ -1440,6 +1440,7 @@ int ath5k_hw_stop_tx_dma(struct ath5k_hw *ah, unsigned int queue)
/* Stop queue */
ath5k_hw_reg_write(ah, tx_queue, AR5K_CR);
+ ath5k_hw_reg_read(ah, AR5K_CR);
} else {
/*
* Schedule TX disable and wait until queue is empty
@@ -1456,6 +1457,8 @@ int ath5k_hw_stop_tx_dma(struct ath5k_hw *ah, unsigned int queue)
/* Clear register */
ath5k_hw_reg_write(ah, 0, AR5K_QCU_TXD);
+ if (pending)
+ return -EBUSY;
}
/* TODO: Check for success else return error */
@@ -1716,6 +1719,7 @@ enum ath5k_int ath5k_hw_set_intr(struct ath5k_hw *ah, enum ath5k_int new_mask)
/* ..re-enable interrupts */
ath5k_hw_reg_write(ah, AR5K_IER_ENABLE, AR5K_IER);
+ ath5k_hw_reg_read(ah, AR5K_IER);
return old_mask;
}
--
1.5.6.2
--
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