From e73790a57abc1320b3c3a94da43ae24359687d7c Mon Sep 17 00:00:00 2001
From: Julia Lawall <julia@diku.dk>
Date: Tue, 10 Aug 2010 18:03:12 -0700
Subject: [PATCH] drivers/char/n_gsm.c: add missing spin_unlock_irqrestore

Add a spin_unlock_irqrestore missing on the error path.  Converting the
return to break leads to the spin_unlock_irqrestore at the end of the
function.

The semantic match that finds this problem is as follows:
(http://coccinelle.lip6.fr/)

// <smpl>
@@
expression E1;
@@

* spin_lock_irqsave(E1,...);
  <+... when != E1
  if (...) {
    ... when != E1
*   return ...;
  }
  ...+>
* spin_unlock_irqrestore(E1,...);
// </smpl>

Signed-off-by: Julia Lawall <julia@diku.dk>
Cc: Greg Kroah-Hartman <gregkh@suse.de>
Cc: Alan Cox <alan@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
 drivers/char/n_gsm.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/char/n_gsm.c b/drivers/char/n_gsm.c
index 099105e0894e..04ef3ef0a422 100644
--- a/drivers/char/n_gsm.c
+++ b/drivers/char/n_gsm.c
@@ -919,7 +919,7 @@ static void gsm_dlci_data_sweep(struct gsm_mux *gsm)
 		else
 			len = gsm_dlci_data_output_framed(gsm, dlci);
 		if (len < 0)
-			return;
+			break;
 		/* DLCI empty - try the next */
 		if (len == 0)
 			i++;
-- 
2.20.1