From: Michael Thalmeier <Michael.Thalmeier@sigmatek.at>
Date: Fri, 15 Jul 2011 01:28:26 +0000 (+0000)
Subject: r6040: only disable RX interrupt if napi_schedule_prep is successful
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=0d9b6e738a22244d38def847a24e5ee6fcedd898;p=linux-beck.git

r6040: only disable RX interrupt if napi_schedule_prep is successful

When receiving the first RX interrupt before the internal call
to napi_schedule_prep is successful the RX interrupt gets disabled
and is never enabled again as the poll function never gets executed.

Signed-off-by: Michael Thalmeier <Michael.Thalmeier@sigmatek.at>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/r6040.c b/drivers/net/r6040.c
index 200a363c3bf5..0ffec4608441 100644
--- a/drivers/net/r6040.c
+++ b/drivers/net/r6040.c
@@ -677,9 +677,11 @@ static irqreturn_t r6040_interrupt(int irq, void *dev_id)
 		if (status & RX_FIFO_FULL)
 			dev->stats.rx_fifo_errors++;
 
-		/* Mask off RX interrupt */
-		misr &= ~RX_INTS;
-		napi_schedule(&lp->napi);
+		if (likely(napi_schedule_prep(&lp->napi))) {
+			/* Mask off RX interrupt */
+			misr &= ~RX_INTS;
+			__napi_schedule(&lp->napi);
+		}
 	}
 
 	/* TX interrupt request */