[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>
diff --git a/drivers/char/isicom.c b/drivers/char/isicom.c
index 42171ad..eddb8d3a 100644
--- a/drivers/char/isicom.c
+++ b/drivers/char/isicom.c
@@ -540,6 +540,11 @@
return IRQ_NONE;
base = card->base;
+
+ /* did the card interrupt us? */
+ if (!(inw(base + 0x0e) & 0x02))
+ return IRQ_NONE;
+
spin_lock(&card->card_lock);
/*