linux-kernel - [PATCH 2/2] drivers/mmc/host/vub300.c: add missing usb_free

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Date:	Tue, 24 Jul 2012 17:06:10 +0200
From:	Julia Lawall <Julia.Lawall@...6.fr>
To:	Tony Olech <tony.olech@...ndigitalsystems.com>
Cc:	kernel-janitors@...r.kernel.org, Chris Ball <cjb@...top.org>,
	linux-mmc@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] drivers/mmc/host/vub300.c: add missing usb_free_urb

From: Julia Lawall <Julia.Lawall@...6.fr>

Add missing usb_free_urb on failure path after usb_alloc_urb.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@km exists@
local idexpression e;
expression e1,e2,e3;
type T,T1;
identifier f;
@@

* e = usb_alloc_urb(...)
... when any
    when != e = e1
    when != e1 = (T)e
    when != e1(...,(T)e,...)
    when != &e->f
if(...) { ... when != e2(...,(T1)e,...)
                 when != e3 = e
                 when forall
(
             return <+...e...+>;
|
*             return ...;
) }
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@...6.fr>

---
 drivers/mmc/host/vub300.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/vub300.c b/drivers/mmc/host/vub300.c
index 3135a1a..6c39bf1 100644
--- a/drivers/mmc/host/vub300.c
+++ b/drivers/mmc/host/vub300.c
@@ -2358,9 +2358,9 @@ error5:
 	 * which is contained at the end of struct mmc
 	 */
 error4:
-	usb_free_urb(command_out_urb);
-error1:
 	usb_free_urb(command_res_urb);
+error1:
+	usb_free_urb(command_out_urb);
 error0:
 	return retval;
 }

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