-stable review patch. If anyone has any objections, please let us know.
------------------
From: Michael Buesch <[EMAIL PROTECTED]>
Drain the Microcode TX-status-FIFO before we enable IRQs.
This is required, because the FIFO may still have entries left
from a previous run. Those would immediately fire after enabling
IRQs and would lead to an oops in the DMA TXstatus handling code.
Cc: "John W. Linville" <[EMAIL PROTECTED]>
Signed-off-by: Michael Buesch <[EMAIL PROTECTED]>
Signed-off-by: Larry Finger <[EMAIL PROTECTED]>
Signed-off-by: Chris Wright <[EMAIL PROTECTED]>
---
drivers/net/wireless/bcm43xx/bcm43xx_main.c | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
--- linux-2.6.18.4.orig/drivers/net/wireless/bcm43xx/bcm43xx_main.c
+++ linux-2.6.18.4/drivers/net/wireless/bcm43xx/bcm43xx_main.c
@@ -1463,6 +1463,23 @@ static void handle_irq_transmit_status(s
}
}
+static void drain_txstatus_queue(struct bcm43xx_private *bcm)
+{
+ u32 dummy;
+
+ if (bcm->current_core->rev < 5)
+ return;
+ /* Read all entries from the microcode TXstatus FIFO
+ * and throw them away.
+ */
+ while (1) {
+ dummy = bcm43xx_read32(bcm, BCM43xx_MMIO_XMITSTAT_0);
+ if (!dummy)
+ break;
+ dummy = bcm43xx_read32(bcm, BCM43xx_MMIO_XMITSTAT_1);
+ }
+}
+
static void bcm43xx_generate_noise_sample(struct bcm43xx_private *bcm)
{
bcm43xx_shm_write16(bcm, BCM43xx_SHM_SHARED, 0x408, 0x7F7F);
@@ -3517,6 +3534,7 @@ int bcm43xx_select_wireless_core(struct
bcm43xx_macfilter_clear(bcm, BCM43xx_MACFILTER_ASSOC);
bcm43xx_macfilter_set(bcm, BCM43xx_MACFILTER_SELF, (u8
*)(bcm->net_dev->dev_addr));
bcm43xx_security_init(bcm);
+ drain_txstatus_queue(bcm);
ieee80211softmac_start(bcm->net_dev);
/* Let's go! Be careful after enabling the IRQs.
--
-
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