From: Jiri Slaby <jirislaby@gmail.com>

Check if the card really interrupted us by reading its IO space and eventualy
return IRQ_NONE.

Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
---

 drivers/char/isicom.c |    5 +++++
 1 file changed, 5 insertions(+)

diff -puN drivers/char/isicom.c~char-isicom-check-card-state-in-isr drivers/char/isicom.c
--- a/drivers/char/isicom.c~char-isicom-check-card-state-in-isr
+++ a/drivers/char/isicom.c
@@ -540,6 +540,11 @@ static irqreturn_t isicom_interrupt(int 
 		return IRQ_NONE;
 
 	base = card->base;
+
+	/* did the card interrupt us? */
+	if (!(inw(base + 0x0e) & 0x02))
+		return IRQ_NONE;
+
 	spin_lock(&card->card_lock);
 
 	/*
_