2.6.26-stable review patch. If anyone has any objections, please let us know.

------------------

From: Alexey Dobriyan

commit 74573ee7096a4ffc2f098108d21c85801b9c7434 upstream

On Wed, Jul 23, 2008 at 03:52:36PM +0300, Andrei Popa wrote:
> I installed gnokii-0.6.22-r2 and gave the command "gnokii --identify"
> and the kernel oopsed:
>
> BUG: unable to handle kernel NULL pointer dereference at 00000458
> IP: [] mutex_unlock+0x0/0xb
> [] acm_tty_open+0x4c/0x214


Signed-off-by: Alexey Dobriyan
Tested-by: Andrei Popa
Signed-off-by: Andrew Morton
Signed-off-by: Greg Kroah-Hartman

---
drivers/usb/class/cdc-acm.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)

--- a/drivers/usb/class/cdc-acm.c
+++ b/drivers/usb/class/cdc-acm.c
@@ -525,8 +525,8 @@ static int acm_tty_open(struct tty_struc
tasklet_schedule(&acm->urb_task);

done:
-err_out:
mutex_unlock(&acm->mutex);
+err_out:
mutex_unlock(&open_mutex);
return rv;


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