linux-kernel - [PATCH 1/2] ser_gigaset: bail out if gigaset

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Message-Id: <6781d6ac8e6deac9eb1778a287c6f2f71a4d65f7.1455570595.git.pebolle@tiscali.nl>
Date:	Mon, 15 Feb 2016 22:30:39 +0100
From:	Paul Bolle <pebolle@...cali.nl>
To:	Dmitry Vyukov <dvyukov@...gle.com>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH 1/2] ser_gigaset: bail out if gigaset_initcs() fails

The first substantial thing that ser_gigaset's open() operation does, is
calling gigaset_initcs(). That function is well behaved: if it fails it
cleans up after itself and returns NULL. So if we receive a NULL here we
might as well bail out directly. (Note that both the bas_gigaset driver
and the usb_gigaset driver already do that.)

Besides, in the error path tty->disc_data will be set to NULL. But
tty->disc_data hasn't been touched yet, so there's no reason to set it
to NULL.

Not-yet-signed-off-by: Paul Bolle <pebolle@...cali.nl>
---
 drivers/isdn/gigaset/ser-gigaset.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/isdn/gigaset/ser-gigaset.c b/drivers/isdn/gigaset/ser-gigaset.c
index 2a506fe0c8a4..ae69ab89c5c0 100644
--- a/drivers/isdn/gigaset/ser-gigaset.c
+++ b/drivers/isdn/gigaset/ser-gigaset.c
@@ -514,10 +514,8 @@ gigaset_tty_open(struct tty_struct *tty)

 	/* allocate memory for our device state and initialize it */
 	cs = gigaset_initcs(driver, 1, 1, 0, cidmode, GIGASET_MODULENAME);
-	if (!cs) {
-		rc = -ENODEV;
-		goto error;
-	}
+	if (!cs)
+		return -ENODEV;

 	cs->dev = &cs->hw.ser->dev.dev;
 	cs->hw.ser->tty = tty;
-- 
2.4.3