linux-kernel - Re: [PATCH] staging: iio: ad5933: Return correct value for AD5933_OUT

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Date:	Sun, 24 Jul 2016 11:09:39 +0100
From:	Jonathan Cameron <jic23@...nel.org>
To:	Phil Turnbull <phil.turnbull@...cle.com>
Cc:	Lars-Peter Clausen <lars@...afoo.de>,
	Michael Hennerich <Michael.Hennerich@...log.com>,
	Hartmut Knaack <knaack.h@....de>,
	Peter Meerwald-Stadler <pmeerw@...erw.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	"open list:IIO SUBSYSTEM AND DRIVERS" <linux-iio@...r.kernel.org>,
	"open list:STAGING SUBSYSTEM" <devel@...verdev.osuosl.org>,
	open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: iio: ad5933: Return correct value for
 AD5933_OUT_RANGE.

On 21/07/16 16:23, Phil Turnbull wrote:
> The 'break' statement after calling ad5933_cmd only breaks out of the
> 'for' loop, which then unconditionally sets the return value to -EINVAL.
> Move the initialisation of 'ret' so we return the correct value.
> 
> Signed-off-by: Phil Turnbull <phil.turnbull@...cle.com>
As I have nothing in the fixes-togreg branch, I've applied this to
the fixes-togreg-post-rc1 as that's the next one that will go upstream.
I don't tend to send Greg fixes during the merge window as he is
rather busy and won't pick them up until after anyways!

This may be delayed by a few weeks though as I'm travelling.

Thanks,

Jonathan
> ---
>  drivers/staging/iio/impedance-analyzer/ad5933.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/iio/impedance-analyzer/ad5933.c b/drivers/staging/iio/impedance-analyzer/ad5933.c
> index 9f43976..34a6990 100644
> --- a/drivers/staging/iio/impedance-analyzer/ad5933.c
> +++ b/drivers/staging/iio/impedance-analyzer/ad5933.c
> @@ -419,6 +419,7 @@ static ssize_t ad5933_store(struct device *dev,
>  	mutex_lock(&indio_dev->mlock);
>  	switch ((u32)this_attr->address) {
>  	case AD5933_OUT_RANGE:
> +		ret = -EINVAL;
>  		for (i = 0; i < 4; i++)
>  			if (val == st->range_avail[i]) {
>  				st->ctrl_hb &= ~AD5933_CTRL_RANGE(0x3);
> @@ -426,7 +427,6 @@ static ssize_t ad5933_store(struct device *dev,
>  				ret = ad5933_cmd(st, 0);
>  				break;
>  			}
> -		ret = -EINVAL;
>  		break;
>  	case AD5933_IN_PGA_GAIN:
>  		if (sysfs_streq(buf, "1")) {
>