[PATCH 2/3] ucc_geth: Fix netdev watchdog triggering on link changes

Anton Vorontsov avorontsov at ru.mvista.com
Fri Dec 25 02:31:05 EST 2009

Since commit 864fdf884e82bacbe8ca5e93bd43393a61d2e2b4 ("ucc_geth:
Fix hangs after switching from full to half duplex") ucc_geth driver
disables the controller during MAC configuration changes. Though,
disabling the controller might take quite awhile, and so the netdev
watchdog might get upset:

 NETDEV WATCHDOG: eth2 (ucc_geth): transmit queue 0 timed out
 ------------[ cut here ]------------
 Badness at c02729a8 [verbose debug info unavailable]
 NIP: c02729a8 LR: c02729a8 CTR: c01b6088
 REGS: c0451c40 TRAP: 0700   Not tainted  (2.6.32-trunk-8360e)
 NIP [c02729a8] dev_watchdog+0x280/0x290
 LR [c02729a8] dev_watchdog+0x280/0x290
 Call Trace:
 [c0451cf0] [c02729a8] dev_watchdog+0x280/0x290 (unreliable)
 [c0451d50] [c00377c4] run_timer_softirq+0x164/0x224
 [c0451da0] [c0032a38] __do_softirq+0xb8/0x13c
 [c0451df0] [c00065cc] do_softirq+0xa0/0xac
 [c0451e00] [c003280c] irq_exit+0x7c/0x9c
 [c0451e10] [c00640c4] __ipipe_sync_stage+0x248/0x24c

This patch fixes the issue by detaching the netdev during the
time we change the configuration.

Reported-by: Lennart Sorensen <lsorense at csclub.uwaterloo.ca>
Signed-off-by: Anton Vorontsov <avorontsov at ru.mvista.com>
Tested-by: Lennart Sorensen <lsorense at csclub.uwaterloo.ca>
Cc: Stable <stable at vger.kernel.org> [2.6.32]
 drivers/net/ucc_geth.c |    7 +++++--
 1 files changed, 5 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ucc_geth.c b/drivers/net/ucc_geth.c
index 0f8c99e..7fff4c5 100644
--- a/drivers/net/ucc_geth.c
+++ b/drivers/net/ucc_geth.c
@@ -1563,7 +1563,10 @@ static int ugeth_disable(struct ucc_geth_private *ugeth, enum comm_dir mode)
 static void ugeth_quiesce(struct ucc_geth_private *ugeth)
-	/* Wait for and prevent any further xmits. */
+	/* Prevent any further xmits, plus detach the device. */
+	netif_device_detach(ugeth->ndev);
+	/* Wait for any current xmits to finish. */
 	/* Disable the interrupt to avoid NAPI rescheduling. */
@@ -1577,7 +1580,7 @@ static void ugeth_activate(struct ucc_geth_private *ugeth)
-	netif_tx_wake_all_queues(ugeth->ndev);
+	netif_device_attach(ugeth->ndev);
 /* Called every time the controller might need to be made

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