Gitweb: http://git.kernel.org/git/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=819ddc...
Commit: 819ddcafb33136f2ba18018a22edcf857f640528
Parent: 6a55617ed5d1aa62b850de2cf66f5ede2eef4825
Author: Lennert Buytenhek <buytenh@wantstofly.org>
AuthorDate: Sun Aug 24 02:45:32 2008 +0200
Committer: Lennert Buytenhek <buytenh@marvell.com>
CommitDate: Sun Aug 24 03:32:56 2008 +0200
mv643xx_eth: fix NAPI 'rotting packet' issue
When a receive interrupt occurs, mv643xx_eth would first process the
receive descriptors and then ACK the receive interrupt, instead of the
other way round.
This would leave a small race window between processing the last
receive descriptor and clearing the receive interrupt status in which
a new packet could come in, which would then 'rot' in the receive
ring until the next receive interrupt would come in.
Fix this by ACKing (clearing) the receive interrupt condition before
processing the receive descriptors.
Signed-off-by: Lennert Buytenhek <buytenh@marvell.com>
---
drivers/net/mv643xx_eth.c | 3 +--
1 files changed, 1 insertions(+), 2 deletions(-)
diff --git a/drivers/net/mv643xx_eth.c b/drivers/net/mv643xx_eth.c
index 46819af..af279f2 100644
--- a/drivers/net/mv643xx_eth.c
+++ b/drivers/net/mv643xx_eth.c
@@ -650,8 +650,6 @@ static int mv643xx_eth_poll(struct napi_struct *napi, int budget)
if (rx < budget) {
netif_rx_complete(mp->dev, napi);
- wrl(mp, INT_CAUSE(mp->port_num), 0);
- wrl(mp, INT_CAUSE_EXT(mp->port_num), 0);
wrl(mp, INT_MASK(mp->port_num), INT_TX_END | INT_RX | INT_EXT);
}
@@ -1796,6 +1794,7 @@ static irqreturn_t mv643xx_eth_irq(int irq, void *dev_id)
*/
#ifdef MV643XX_ETH_NAPI
if (int_cause & INT_RX) {
+ wrl(mp, INT_CAUSE(mp->port_num), ~(int_cause & INT_RX));
wrl(mp, INT_MASK(mp->port_num), 0x00000000);
rdl(mp, INT_MASK(mp->port_num));
--
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