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authorNicolas Ferre <nicolas.ferre@atmel.com>2013-02-12 14:08:48 +0400
committerDavid S. Miller <davem@davemloft.net>2013-02-13 22:34:10 +0400
commit8770e91aa61127f82eb8a9e641832474dbbcc8f1 (patch)
tree65aa9243d2f96562261e01d2278eb4aae7be84ca /drivers
parentac574804d412047e52de4dd887615cc88f58aeb0 (diff)
downloadlinux-8770e91aa61127f82eb8a9e641832474dbbcc8f1.tar.xz
net/macb: fix race with RX interrupt while doing NAPI
When interrupts are disabled, an RX condition can occur but it is not reported when enabling interrupts again. We need to check RSR and use napi_reschedule() if condition is met. Signed-off-by: Nicolas Ferre <nicolas.ferre@atmel.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers')
-rw-r--r--drivers/net/ethernet/cadence/macb.c5
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/net/ethernet/cadence/macb.c b/drivers/net/ethernet/cadence/macb.c
index a9b0830fb39d..b9d4bb9530e5 100644
--- a/drivers/net/ethernet/cadence/macb.c
+++ b/drivers/net/ethernet/cadence/macb.c
@@ -693,6 +693,11 @@ static int macb_poll(struct napi_struct *napi, int budget)
* get notified when new packets arrive.
*/
macb_writel(bp, IER, MACB_RX_INT_FLAGS);
+
+ /* Packets received while interrupts were disabled */
+ status = macb_readl(bp, RSR);
+ if (unlikely(status))
+ napi_reschedule(napi);
}
/* TODO: Handle errors */