linux-kernel - [PATCH] atmel_serial: Fix interrupt handler return value

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Date:	Thu, 21 Feb 2008 17:56:32 +0100
From:	Haavard Skinnemoen <hskinnemoen@...el.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	linux-kernel@...r.kernel.org, Andrew Victor <linux@...im.org.za>,
	michael <trimarchi@...dalf.sssup.it>,
	Haavard Skinnemoen <hskinnemoen@...el.com>
Subject: [PATCH] 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@...dalf.sssup.it>
Signed-off-by: Haavard Skinnemoen <hskinnemoen@...el.com>
---
 drivers/serial/atmel_serial.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
index fad245b..d57bf3e 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;
 }
 
 /*
-- 
1.5.4.1

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