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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>
This commit is contained in:
Haavard Skinnemoen 2008-02-23 15:23:36 -08:00 committed by Linus Torvalds
parent 98bcef56ca
commit 0400b697ef
1 changed files with 1 additions and 1 deletions
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2
drivers/serial/atmel_serial.c
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@ -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;
}
/*