3.6-stable review patch.  If anyone has any objections, please let me know.

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

From: Wei Yongjun <redacted>

commit b4dd784ba8af03bf1f9ee5118c792d7abd4919bd upstream.

Add the missing unlock on the error handle path in function
pinctrl_groups_show().

Signed-off-by: Wei Yongjun <redacted>
Signed-off-by: Linus Walleij <redacted>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/pinctrl/core.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/drivers/pinctrl/core.c
+++ b/drivers/pinctrl/core.c

@@ -1059,8 +1059,10 @@ static int pinctrl_groups_show(struct se
 			seq_printf(s, "group: %s\n", gname);
 			for (i = 0; i < num_pins; i++) {
 				pname = pin_get_name(pctldev, pins[i]);
-				if (WARN_ON(!pname))
+				if (WARN_ON(!pname)) {
+					mutex_unlock(&pinctrl_mutex);
 					return -EINVAL;
+				}
 				seq_printf(s, "pin %d (%s)\n", pins[i], pname);
 			}
 			seq_puts(s, "\n");