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| author | Anton Vorontsov <avorontsov@ru.mvista.com> | 2009-12-24 05:31:03 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2009-12-26 20:24:42 -0800 |
| commit | 7583605b6d29f1f7f6fc505b883328089f3485ad (patch) | |
| tree | 9974ec28dc080cce67d1c0f7434157fae4c7d365 | |
| parent | b3837ceca005890f1a328eb1a4204a9dc92b1b9f (diff) | |
| download | talos-obmc-linux-7583605b6d29f1f7f6fc505b883328089f3485ad.tar.gz talos-obmc-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>
| -rw-r--r-- | drivers/net/ucc_geth.c | 2 |
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++; |
