linux-kernel - Re: [PATCH] [media] stk1160: Check return value of stk1160_read_reg() in stk1160_i2c_read

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Message-ID: <alpine.LNX.2.00.1210160131240.1682@swampdragon.chaosbits.net>
Date:	Tue, 16 Oct 2012 02:03:51 +0200 (CEST)
From:	Jesper Juhl <jj@...osbits.net>
To:	Ezequiel Garcia <elezegarcia@...il.com>
cc:	Mauro Carvalho Chehab <mchehab@...radead.org>,
	linux-media@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] [media] stk1160: Check return value of stk1160_read_reg()
 in stk1160_i2c_read_reg()

On Mon, 15 Oct 2012, Ezequiel Garcia wrote:

> On Mon, Oct 15, 2012 at 7:52 PM, Jesper Juhl <jj@...osbits.net> wrote:
> > On Mon, 15 Oct 2012, Jesper Juhl wrote:
> >
> >> On Sat, 13 Oct 2012, Ezequiel Garcia wrote:
> >>
[...]
> > Currently there are two checks for 'rc' being less than zero with no
> > change to 'rc' between the two, so the second is just dead code.
> > The intention seems to have been to assign the return value of
> > 'stk1160_read_reg()' to 'rc' before the (currently dead) second check
> > and then test /that/. This patch does that.
> >
> 
> This is an overly complicated explanation for such a small patch.
> Can you try to simplify it?
> 
How's this?


From: Jesper Juhl <jj@...osbits.net>
Date: Sat, 13 Oct 2012 00:16:37 +0200
Subject: [PATCH] [media] stk1160: Check return value of stk1160_read_reg() in stk1160_i2c_read_reg()

Remember to collect the exit status from 'stk1160_read_reg()' in 'rc' 
before testing it for less than zero.

Signed-off-by: Jesper Juhl <jj@...osbits.net>
---
 drivers/media/usb/stk1160/stk1160-i2c.c |    3 +--
 1 files changed, 1 insertions(+), 2 deletions(-)

diff --git a/drivers/media/usb/stk1160/stk1160-i2c.c b/drivers/media/usb/stk1160/stk1160-i2c.c
index 176ac93..a2370e4 100644
--- a/drivers/media/usb/stk1160/stk1160-i2c.c
+++ b/drivers/media/usb/stk1160/stk1160-i2c.c
@@ -116,10 +116,9 @@ static int stk1160_i2c_read_reg(struct stk1160 *dev, u8 addr,
 	if (rc < 0)
 		return rc;
 
-	stk1160_read_reg(dev, STK1160_SBUSR_RD, value);
+	rc = stk1160_read_reg(dev, STK1160_SBUSR_RD, value);
 	if (rc < 0)
 		return rc;
-
 	return 0;
 }
 
-- 
1.7.1


-- 
Jesper Juhl <jj@...osbits.net>       http://www.chaosbits.net/
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