drivers/char/n_gsm.c: add missing spin_unlock_irqrestore
Julia Lawall [Wed, 11 Aug 2010 01:03:12 +0000 (18:03 -0700)]
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

index 099105e..04ef3ef 100644 (file)
@@ -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++;