linux-kernel - [PATCH 14/17] drivers/char/n_gsm.c: Add missing spin_unlock

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Date:	Wed, 26 May 2010 17:58:28 +0200 (CEST)
From:	Julia Lawall <julia@...u.dk>
To:	linux-kernel@...r.kernel.org, kernel-janitors@...r.kernel.org
Subject: [PATCH 14/17] drivers/char/n_gsm.c: Add missing spin_unlock_irqrestore

From: Julia Lawall <julia@...u.dk>

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@...u.dk>

---
 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 c4161d5..ab89cef 100644
--- a/drivers/char/n_gsm.c
+++ b/drivers/char/n_gsm.c
@@ -922,7 +922,7 @@ 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++;
--
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