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authorMichael Buesch <mb@bu3sch.de>2006-10-27 11:16:39 -0500
committerChris Wright <chrisw@sous-sol.org>2006-11-03 17:33:46 -0800
commit37f8d2f4d123433cd1fd2936e9bc726be0939ef0 (patch)
tree9e5406ea3a5af1f6a8134b46914ea4284078b60e /drivers
parent955ebc8df7709dbcb92d7bf74a2598282e1c9307 (diff)
[PATCH] bcm43xx: fix watchdog timeouts.
This fixes a netdev watchdog timeout problem. The problem is caused by a needed netif_tx_disable in the hardware calibration code and can be shown by the following timegraph. |---5secs - ~10 jiffies time---|---|OOPS ^ ^ last real TX periodic work stops netif At OOPS, the following happens: The watchdog timer triggers, because the timeout of 5secs is over. The watchdog first checks for stopped TX. _Usually_ TX is only stopped from the TX handler to indicate a full TX queue. But this is different. We need to stop TX here, regardless of the TX queue state. So the watchdog recognizes the stopped device and assumes it is stopped due to full TX queues (Which is a _wrong_ assumption in this case). It then tests how far the last TX has been in the past. If it's more than 5secs (which is the case for low or no traffic), it will fire a TX timeout. Acked-by: 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: Greg Kroah-Hartman <gregkh@suse.de> Signed-off-by: Chris Wright <chrisw@sous-sol.org>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/wireless/bcm43xx/bcm43xx_main.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/net/wireless/bcm43xx/bcm43xx_main.c b/drivers/net/wireless/bcm43xx/bcm43xx_main.c
index 3a73d89a6501..f24ba4d426b4 100644
--- a/drivers/net/wireless/bcm43xx/bcm43xx_main.c
+++ b/drivers/net/wireless/bcm43xx/bcm43xx_main.c
@@ -3165,7 +3165,15 @@ static void bcm43xx_periodic_work_handler(void *d)
badness = estimate_periodic_work_badness(bcm->periodic_state);
mutex_lock(&bcm->mutex);
+
+ /* We must fake a started transmission here, as we are going to
+ * disable TX. If we wouldn't fake a TX, it would be possible to
+ * trigger the netdev watchdog, if the last real TX is already
+ * some time on the past (slightly less than 5secs)
+ */
+ bcm->net_dev->trans_start = jiffies;
netif_tx_disable(bcm->net_dev);
+
spin_lock_irqsave(&bcm->irq_lock, flags);
if (badness > BADNESS_LIMIT) {
/* Periodic work will take a long time, so we want it to