From: Thomas Chou <thomas@wytron.com.tw>
Date: Wed, 7 Oct 2009 14:16:43 +0000 (+0000)
Subject: ethoc: clear only pending irqs
X-Git-Tag: firefly_0821_release~11864^2~129
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=50c54a57dfbd392e17f1473717b8e125afcb01a3;p=firefly-linux-kernel-4.4.55.git

ethoc: clear only pending irqs

This patch fixed the problem of dropped packets due to lost of
interrupt requests. We should only clear what was pending at the
moment we read the irq source reg.

Signed-off-by: Thomas Chou <thomas@wytron.com.tw>
Signed-off-by: David S. Miller <davem@davemloft.net>
---

diff --git a/drivers/net/ethoc.c b/drivers/net/ethoc.c
index 88a1c5223069..590473afb3dc 100644
--- a/drivers/net/ethoc.c
+++ b/drivers/net/ethoc.c
@@ -508,7 +508,7 @@ static irqreturn_t ethoc_interrupt(int irq, void *dev_id)
 		return IRQ_NONE;
 	}
 
-	ethoc_ack_irq(priv, INT_MASK_ALL);
+	ethoc_ack_irq(priv, pending);
 
 	if (pending & INT_MASK_BUSY) {
 		dev_err(&dev->dev, "packet dropped\n");