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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>
This commit is contained in:
Nicolas Ferre 2013-02-12 11:08:48 +01:00 committed by David S. Miller
parent ac574804d4
commit 8770e91aa6
1 changed files with 5 additions and 0 deletions
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5
drivers/net/ethernet/cadence/macb.c
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@ -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 */