From: Sebastian Siewior [EMAIL PROTECTED]
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] [c3dc] 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 [EMAIL PROTECTED]
---
bug report @ http://marc.info/?l=linux-netdevm=121638307116389w=2
I moved it into a workqueue, this is what tg3 does.
I would convert the other three drivers unless $dude suggests a better
method or somebody else takes care
drivers/net/gianfar.c | 22 ++
drivers/net/gianfar.h |2 ++
2 files changed, 20 insertions(+), 4 deletions(-)
diff --git a/drivers/net/gianfar.c b/drivers/net/gianfar.c
index 25bdd08..caa6cbd 100644
--- a/drivers/net/gianfar.c
+++ b/drivers/net/gianfar.c
@@ -112,6 +112,7 @@ 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);
@@ -216,6 +217,7 @@ static int gfar_probe(struct platform_device *pdev)
spin_lock_init(priv-txlock);
spin_lock_init(priv-rxlock);
+ INIT_WORK(priv-reset_task, gfar_reset_task);
platform_set_drvdata(pdev, dev);
@@ -1132,6 +1134,7 @@ static int gfar_close(struct net_device *dev)
napi_disable(priv-napi);
#endif
+ cancel_work_sync(priv-reset_task);
stop_gfar(dev);
/* Disconnect from the PHY */
@@ -1246,13 +1249,16 @@ 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);
@@ -1262,6 +1268,14 @@ static void gfar_timeout(struct net_device *dev)
netif_schedule(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 27f37c8..d983a6a 100644
--- a/drivers/net/gianfar.h
+++ b/drivers/net/gianfar.h
@@ -759,6 +759,8 @@ struct gfar_private {
uint32_t msg_enable;
+ struct work_struct reset_task;
+
/* Network Statistics */
struct gfar_extra_stats extra_stats;
};
--
1.5.5.2
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