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authorAnton Vorontsov <avorontsov@ru.mvista.com>2009-12-24 06:31:03 +0100
committerDavid S. Miller <davem@davemloft.net>2009-12-27 05:24:42 +0100
commit7583605b6d29f1f7f6fc505b883328089f3485ad (patch)
tree9974ec28dc080cce67d1c0f7434157fae4c7d365 /drivers/net/ucc_geth.c
parentvxge: use DMA_BIT_MASK instead of plain values. (diff)
downloadlinux-7583605b6d29f1f7f6fc505b883328089f3485ad.tar.xz
linux-7583605b6d29f1f7f6fc505b883328089f3485ad.zip
ucc_geth: Fix empty TX queue processing
Following oops was seen with the ucc_geth driver: Unable to handle kernel paging request for data at address 0x00000058 Faulting instruction address: 0xc024f2fc Oops: Kernel access of bad area, sig: 11 [#1] [...] NIP [c024f2fc] skb_recycle_check+0x14/0x100 LR [e30aa0a4] ucc_geth_poll+0xd8/0x4e0 [ucc_geth_driver] Call Trace: [df857d50] [c000b03c] __ipipe_grab_irq+0x3c/0xa4 (unreliable) [df857d60] [e30aa0a4] ucc_geth_poll+0xd8/0x4e0 [ucc_geth_driver] [df857dd0] [c0258cf8] net_rx_action+0xf8/0x1b8 [df857e10] [c0032a38] __do_softirq+0xb8/0x13c [df857e60] [c00065cc] do_softirq+0xa0/0xac [...] This is because ucc_geth_tx() tries to process an empty queue when queues are logically stopped. Stopping the queues doesn't disable polling, and since nowadays ucc_geth_tx() is actually called from the polling routine, the oops above might pop up. Fix this by removing 'netif_queue_stopped() == 0' check. Reported-by: Lennart Sorensen <lsorense@csclub.uwaterloo.ca> Signed-off-by: Anton Vorontsov <avorontsov@ru.mvista.com> Tested-by: Lennart Sorensen <lsorense@csclub.uwaterloo.ca> Cc: Stable <stable@vger.kernel.org> [2.6.32] Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/ucc_geth.c')
-rw-r--r--drivers/net/ucc_geth.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ucc_geth.c b/drivers/net/ucc_geth.c
index afaf088b72ea..0f8c99e845dd 100644
--- a/drivers/net/ucc_geth.c
+++ b/drivers/net/ucc_geth.c
@@ -3273,7 +3273,7 @@ static int ucc_geth_tx(struct net_device *dev, u8 txQ)
/* Handle the transmitted buffer and release */
/* the BD to be used with the current frame */
- if ((bd == ugeth->txBd[txQ]) && (netif_queue_stopped(dev) == 0))
+ if (bd == ugeth->txBd[txQ]) /* queue empty? */
break;
dev->stats.tx_packets++;