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authorSebastian Siewior <bigeasy@linutronix.de>2008-08-19 21:12:45 +0200
committerJeff Garzik <jgarzik@redhat.com>2008-08-27 05:55:19 -0400
commitab9399059bb85a94758f42fb25607e440e926cc6 (patch)
treee56738237e0f855cf5a19f234cec611782c7d2a4
parentedcfe5f7e307846e578fb88d69fa27051fded0ab (diff)
net: don't grab a mutex within a timer context in gianfar
I got the following backtrace while network was unavailble: |NETDEV WATCHDOG: eth0: transmit timed out |BUG: sleeping function called from invalid context at /home/bigeasy/git/linux-2.6-powerpc/kernel/mutex.c:87 |in_atomic():1, irqs_disabled():0 |Call Trace: |[c0383d90] [c0006dd8] show_stack+0x48/0x184 (unreliable) |[c0383db0] [c001e938] __might_sleep+0xe0/0xf4 |[c0383dc0] [c025a43c] mutex_lock+0x24/0x3c |[c0383de0] [c019005c] phy_stop+0x20/0x70 |[c0383df0] [c018d4ec] stop_gfar+0x28/0xf4 |[c0383e10] [c018e8c4] gfar_timeout+0x30/0x60 |[c0383e20] [c01fe7c0] dev_watchdog+0xa8/0x144 |[c0383e30] [c002f93c] run_timer_softirq+0x148/0x1c8 |[c0383e60] [c002b084] __do_softirq+0x5c/0xc4 |[c0383e80] [c00046fc] do_softirq+0x3c/0x54 |[c0383e90] [c002ac60] irq_exit+0x3c/0x5c |[c0383ea0] [c000b378] timer_interrupt+0xe0/0xf8 |[c0383ec0] [c000e5ac] ret_from_except+0x0/0x18 |[c0383f80] [c000804c] cpu_idle+0xcc/0xdc |[c0383fa0] [c025c07c] etext+0x7c/0x90 |[c0383fc0] [c0338960] start_kernel+0x294/0x2a8 |[c0383ff0] [c00003dc] skpinv+0x304/0x340 |------------[ cut here ]------------ The phylock was once a spinlock but got changed into a mutex via commit 35b5f6b1a aka [PHYLIB: Locking fixes for PHY I/O potentially sleeping] Signed-off-by: Sebastian Siewior <bigeasy@linutronix.de> Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
-rw-r--r--drivers/net/gianfar.c22
-rw-r--r--drivers/net/gianfar.h1
2 files changed, 19 insertions, 4 deletions
diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index 999d6916827..4320a983a58 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -105,6 +105,7 @@ const char gfar_driver_version[] = "1.3";
static int gfar_enet_open(struct net_device *dev);
static int gfar_start_xmit(struct sk_buff *skb, struct net_device *dev);
+static void gfar_reset_task(struct work_struct *work);
static void gfar_timeout(struct net_device *dev);
static int gfar_close(struct net_device *dev);
struct sk_buff *gfar_new_skb(struct net_device *dev);
@@ -209,6 +210,7 @@ static int gfar_probe(struct platform_device *pdev)
spin_lock_init(&priv->txlock);
spin_lock_init(&priv->rxlock);
spin_lock_init(&priv->bflock);
+ INIT_WORK(&priv->reset_task, gfar_reset_task);
platform_set_drvdata(pdev, dev);
@@ -1212,6 +1214,7 @@ static int gfar_close(struct net_device *dev)
napi_disable(&priv->napi);
+ cancel_work_sync(&priv->reset_task);
stop_gfar(dev);
/* Disconnect from the PHY */
@@ -1326,13 +1329,16 @@ static int gfar_change_mtu(struct net_device *dev, int new_mtu)
return 0;
}
-/* gfar_timeout gets called when a packet has not been
+/* gfar_reset_task gets scheduled when a packet has not been
* transmitted after a set amount of time.
* For now, assume that clearing out all the structures, and
- * starting over will fix the problem. */
-static void gfar_timeout(struct net_device *dev)
+ * starting over will fix the problem.
+ */
+static void gfar_reset_task(struct work_struct *work)
{
- dev->stats.tx_errors++;
+ struct gfar_private *priv = container_of(work, struct gfar_private,
+ reset_task);
+ struct net_device *dev = priv->dev;
if (dev->flags & IFF_UP) {
stop_gfar(dev);
@@ -1342,6 +1348,14 @@ static void gfar_timeout(struct net_device *dev)
netif_tx_schedule_all(dev);
}
+static void gfar_timeout(struct net_device *dev)
+{
+ struct gfar_private *priv = netdev_priv(dev);
+
+ dev->stats.tx_errors++;
+ schedule_work(&priv->reset_task);
+}
+
/* Interrupt Handler for Transmit complete */
static int gfar_clean_tx_ring(struct net_device *dev)
{
diff --git a/drivers/net/gianfar.h b/drivers/net/gianfar.h
index d59df98bd63..f46e9b63af1 100644
--- a/drivers/net/gianfar.h
+++ b/drivers/net/gianfar.h
@@ -756,6 +756,7 @@ struct gfar_private {
uint32_t msg_enable;
+ struct work_struct reset_task;
/* Network Statistics */
struct gfar_extra_stats extra_stats;
};