[PATCH] Char: isicom, fix locking in isr

2 spin_unlocks are omitted in the interrupt handler.  Put them there to fix up
deadlocking on UP.

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, 2 insertions, 0 deletions

diff --git a/drivers/char/isicom.c b/drivers/char/isicom.c
index 26d3f78bf8ed..c837ade1e80b 100644
--- a/drivers/char/isicom.c
+++ b/drivers/char/isicom.c
@@ -564,6 +564,7 @@ static irqreturn_t isicom_interrupt(int irq, void *dev_id)
         port = card->ports + channel;
         if (!(port->flags & ASYNC_INITIALIZED)) {
                 outw(0x0000, base+0x04); /* enable interrupts */
+                spin_unlock(&card->card_lock);
                 return IRQ_HANDLED;
         }
 
@@ -678,6 +679,7 @@ static irqreturn_t isicom_interrupt(int irq, void *dev_id)
                 tty_flip_buffer_push(tty);
         }
         outw(0x0000, base+0x04); /* enable interrupts */
+        spin_unlock(&card->card_lock);
 
         return IRQ_HANDLED;
 }