From: Haavard Skinnemoen <hskinnemoen@atmel.com>
Date: Sat, 23 Feb 2008 23:23:36 +0000 (-0800)
Subject: atmel_serial: fix interrupt handler return value
X-Git-Tag: v2.6.25-rc3~53
X-Git-Url: https://err.no/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0400b697ef20247d26427e4beb6a84ca5aa51f45;p=linux-2.6

atmel_serial: fix interrupt handler return value

We should only return IRQ_HANDLED when we actually found something to
handle. This is important since the USART interrupt handler may be
shared with the timer interrupt on some chips.

Pointed-out-by: michael <trimarchi@gandalf.sssup.it>
Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---

diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
index fad245b064..d57bf3e708 100644
--- a/drivers/serial/atmel_serial.c
+++ b/drivers/serial/atmel_serial.c
@@ -549,7 +549,7 @@ static irqreturn_t atmel_interrupt(int irq, void *dev_id)
 		atmel_handle_transmit(port, pending);
 	} while (pass_counter++ < ATMEL_ISR_PASS_LIMIT);
 
-	return IRQ_HANDLED;
+	return pass_counter ? IRQ_HANDLED : IRQ_NONE;
 }
 
 /*