Messages in this thread Patch in this message | | | Date | Wed, 29 Nov 2006 14:00:21 -0800 | From | Chris Wright <> | Subject | [patch 10/23] bcm43xx: Drain TX status before starting IRQs |
| |
-stable review patch. If anyone has any objections, please let us know. ------------------
From: Michael Buesch <mb@bu3sch.de>
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" <linville@tuxdriver.com> Signed-off-by: Michael Buesch <mb@bu3sch.de> Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net> Signed-off-by: Chris Wright <chrisw@sous-sol.org> --- 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. -- - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
| |