linux-kernel - Re: [PATCH] radio-si470x-common: -EINVAL overwritten in si470x_vidioc_s

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Date:	Thu, 18 Feb 2010 20:50:41 +0100
From:	Tobias Lorenz <tobias.lorenz@....net>
To:	Mauro Carvalho Chehab <mchehab@...radead.org>
Cc:	Roel Kluin <roel.kluin@...il.com>, linux-media@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] radio-si470x-common: -EINVAL overwritten in si470x_vidioc_s_tuner()

Hello Mauro,

> > no, the default value of retval makes no difference to the function.
> > 
> > Retval is set by si470x_disconnect_check and si470x_set_register.
> > After each call, retval is checked.
> > There is no need to reset it passed.

> You may just do then:
> 
> 	int retval = si470x_disconnect_check(radio);

In all other set/get functions of v4l2_ioctl_ops in the driver, I just set the default value of retval to 0.
To be identical in si470x_vidioc_s_tuner, I modified the patch to the one below.
I already pushed this and another cosmetic patch into mercurial:

http://linuxtv.org/hg/~tlorenz/v4l-dvb/rev/72a2f38d5956
http://linuxtv.org/hg/~tlorenz/v4l-dvb/rev/3efd5d32a618

Mauro, can you pull them?

Bye,
Tobias

--- a/linux/drivers/media/radio/si470x/radio-si470x-common.c	Thu Feb 11 23:11:30 2010 -0200
+++ b/linux/drivers/media/radio/si470x/radio-si470x-common.c	Thu Feb 18 20:31:33 2010 +0100
@@ -748,7 +748,7 @@
 		struct v4l2_tuner *tuner)
 {
 	struct si470x_device *radio = video_drvdata(file);
-	int retval = -EINVAL;
+	int retval = 0;
 
 	/* safety checks */
 	retval = si470x_disconnect_check(radio);
--
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