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

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Date:	Tue, 16 Oct 2012 00:52:26 +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: [PATCH] [media] stk1160: Check return value of stk1160_read_reg()
 in stk1160_i2c_read_reg()

On Mon, 15 Oct 2012, Jesper Juhl wrote:

> On Sat, 13 Oct 2012, Ezequiel Garcia wrote:
> 
> > On Sun, Nov 9, 2008 at 2:04 PM, Jesper Juhl <jj@...osbits.net> wrote:
> > > 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 - remove it.
> > >
> > > Signed-off-by: Jesper Juhl <jj@...osbits.net>
> > > ---
> > >  drivers/media/usb/stk1160/stk1160-i2c.c |    3 ---
> > >  1 files changed, 0 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/drivers/media/usb/stk1160/stk1160-i2c.c b/drivers/media/usb/stk1160/stk1160-i2c.c
> > > index 176ac93..035cf8c 100644
> > > --- a/drivers/media/usb/stk1160/stk1160-i2c.c
> > > +++ b/drivers/media/usb/stk1160/stk1160-i2c.c
> > > @@ -117,9 +117,6 @@ static int stk1160_i2c_read_reg(struct stk1160 *dev, u8 addr,
> > >                 return rc;
> > >
> > >         stk1160_read_reg(dev, STK1160_SBUSR_RD, value);
> > > -       if (rc < 0)
> > > -               return rc;
> > > -
> > >         return 0;
> > >  }
> > >
> > 
> > Thanks for doing this. Wouldn't you like to save stk1160_read_reg
> > return code to rc, instead of this?
> > 
> Ahh yes, I guess I was too quick to just assume it was dead code. 
> Looking at it again; what you suggest must have been the original 
> intention. I'll cook up a new patch.
> 
> Thanks.
> 
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()

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.

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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