[PATCH] Char: isicom, check card state in isr

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@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/char/isicom.c b/drivers/char/isicom.c
index 42171ad001dd..eddb8d3a620e 100644
--- a/drivers/char/isicom.c
+++ b/drivers/char/isicom.c
@@ -540,6 +540,11 @@ static irqreturn_t isicom_interrupt(int irq, void *dev_id)
                 return IRQ_NONE;
 
         base = card->base;
+
+        /* did the card interrupt us? */
+        if (!(inw(base + 0x0e) & 0x02))
+                return IRQ_NONE;
+
         spin_lock(&card->card_lock);
 
         /*