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authorLarry Finger <Larry.Finger@lwfinger.net>2007-09-21 19:20:01 -0500
committerGreg Kroah-Hartman <gregkh@suse.de>2007-09-26 10:54:44 -0700
commit4c532d5cee25b7b1e8fb990d430c7a4b420b8bb5 (patch)
tree4e67a831fc10f3981a69d2ce46db16c8a6fa8e69
parentf2727f8d5b360a161a3aeeb798df86f7b1aa7270 (diff)
bcm43xx: Fix cancellation of work queue crashes
port of 3f7086978fc0193eff24a77d8b57ac4debc088fa from mainline. A crash upon booting that is caused by bcm43xx has been reported [1] and found to be due to a work queue being reinitialized while work on that queue is still pending. This fix modifies the shutdown of work queues and prevents periodic work from being requeued during shutdown. With this patch, no more crashes on reboot were observed by the original reporter. I do not get that particular failure on my system; however, when running a large number of ifdown/ifup sequences, my system would kernel panic with the 'caps lock' light blinking at roughly a 1 Hz rate. In addition, there were infrequent failures in the firmware that resulted in 'IRQ READY TIMEOUT' errors. With this patch, no more of the first type of failure occur, and incidence of the second type is greatly reduced. [1] http://bugzilla.kernel.org/show_bug.cgi?id=8937 Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net> Acked-by: Michael Buesch <mb@bu3sch.de> Signed-off-by: John W. Linville <linville@tuxdriver.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--drivers/net/wireless/bcm43xx/bcm43xx_main.c28
-rw-r--r--drivers/net/wireless/bcm43xx/bcm43xx_main.h2
-rw-r--r--drivers/net/wireless/bcm43xx/bcm43xx_sysfs.c2
3 files changed, 22 insertions, 10 deletions
diff --git a/drivers/net/wireless/bcm43xx/bcm43xx_main.c b/drivers/net/wireless/bcm43xx/bcm43xx_main.c
index ef6b253a92ce..dadee8553d43 100644
--- a/drivers/net/wireless/bcm43xx/bcm43xx_main.c
+++ b/drivers/net/wireless/bcm43xx/bcm43xx_main.c
@@ -3183,6 +3183,9 @@ static void bcm43xx_periodic_work_handler(struct work_struct *work)
unsigned long orig_trans_start = 0;
mutex_lock(&bcm->mutex);
+ /* keep from doing and rearming periodic work if shutting down */
+ if (bcm43xx_status(bcm) == BCM43xx_STAT_UNINIT)
+ goto unlock_mutex;
if (unlikely(bcm->periodic_state % 60 == 0)) {
/* Periodic work will take a long time, so we want it to
* be preemtible.
@@ -3228,14 +3231,10 @@ static void bcm43xx_periodic_work_handler(struct work_struct *work)
mmiowb();
bcm->periodic_state++;
spin_unlock_irqrestore(&bcm->irq_lock, flags);
+unlock_mutex:
mutex_unlock(&bcm->mutex);
}
-void bcm43xx_periodic_tasks_delete(struct bcm43xx_private *bcm)
-{
- cancel_rearming_delayed_work(&bcm->periodic_work);
-}
-
void bcm43xx_periodic_tasks_setup(struct bcm43xx_private *bcm)
{
struct delayed_work *work = &bcm->periodic_work;
@@ -3285,6 +3284,14 @@ static int bcm43xx_rng_init(struct bcm43xx_private *bcm)
return err;
}
+void bcm43xx_cancel_work(struct bcm43xx_private *bcm)
+{
+ /* The system must be unlocked when this routine is entered.
+ * If not, the next 2 steps may deadlock */
+ cancel_work_sync(&bcm->restart_work);
+ cancel_rearming_delayed_work(&bcm->periodic_work);
+}
+
static int bcm43xx_shutdown_all_wireless_cores(struct bcm43xx_private *bcm)
{
int ret = 0;
@@ -3321,7 +3328,12 @@ static void bcm43xx_free_board(struct bcm43xx_private *bcm)
{
bcm43xx_rng_exit(bcm);
bcm43xx_sysfs_unregister(bcm);
- bcm43xx_periodic_tasks_delete(bcm);
+
+ mutex_lock(&(bcm)->mutex);
+ bcm43xx_set_status(bcm, BCM43xx_STAT_UNINIT);
+ mutex_unlock(&(bcm)->mutex);
+
+ bcm43xx_cancel_work(bcm);
mutex_lock(&(bcm)->mutex);
bcm43xx_shutdown_all_wireless_cores(bcm);
@@ -4018,7 +4030,7 @@ static int bcm43xx_net_stop(struct net_device *net_dev)
err = bcm43xx_disable_interrupts_sync(bcm);
assert(!err);
bcm43xx_free_board(bcm);
- flush_scheduled_work();
+ bcm43xx_cancel_work(bcm);
return 0;
}
@@ -4150,9 +4162,9 @@ static void bcm43xx_chip_reset(struct work_struct *work)
struct bcm43xx_phyinfo *phy;
int err = -ENODEV;
+ bcm43xx_cancel_work(bcm);
mutex_lock(&(bcm)->mutex);
if (bcm43xx_status(bcm) == BCM43xx_STAT_INITIALIZED) {
- bcm43xx_periodic_tasks_delete(bcm);
phy = bcm43xx_current_phy(bcm);
err = bcm43xx_select_wireless_core(bcm, phy->type);
if (!err)
diff --git a/drivers/net/wireless/bcm43xx/bcm43xx_main.h b/drivers/net/wireless/bcm43xx/bcm43xx_main.h
index c8f3c532bab5..14cfbeb582ef 100644
--- a/drivers/net/wireless/bcm43xx/bcm43xx_main.h
+++ b/drivers/net/wireless/bcm43xx/bcm43xx_main.h
@@ -122,7 +122,7 @@ void bcm43xx_wireless_core_reset(struct bcm43xx_private *bcm, int connect_phy);
void bcm43xx_mac_suspend(struct bcm43xx_private *bcm);
void bcm43xx_mac_enable(struct bcm43xx_private *bcm);
-void bcm43xx_periodic_tasks_delete(struct bcm43xx_private *bcm);
+void bcm43xx_cancel_work(struct bcm43xx_private *bcm);
void bcm43xx_periodic_tasks_setup(struct bcm43xx_private *bcm);
void bcm43xx_controller_restart(struct bcm43xx_private *bcm, const char *reason);
diff --git a/drivers/net/wireless/bcm43xx/bcm43xx_sysfs.c b/drivers/net/wireless/bcm43xx/bcm43xx_sysfs.c
index c71b998a3694..8ab5f93d192a 100644
--- a/drivers/net/wireless/bcm43xx/bcm43xx_sysfs.c
+++ b/drivers/net/wireless/bcm43xx/bcm43xx_sysfs.c
@@ -327,7 +327,7 @@ static ssize_t bcm43xx_attr_phymode_store(struct device *dev,
goto out;
}
- bcm43xx_periodic_tasks_delete(bcm);
+ bcm43xx_cancel_work(bcm);
mutex_lock(&(bcm)->mutex);
err = bcm43xx_select_wireless_core(bcm, phytype);
if (!err)