[PATCH] Staging: iio: Fix sparse endian warning

[PATCH] Staging: iio: Fix sparse endian warning

[Ksenija Stanojevic]

Fix following sparse warning:
warning: cast to restricted __be16

Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
---
 drivers/staging/iio/adc/ad7606_spi.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/staging/iio/adc/ad7606_spi.c b/drivers/staging/iio/adc/ad7606_spi.c
index d873a51..825da07 100644
--- a/drivers/staging/iio/adc/ad7606_spi.c
+++ b/drivers/staging/iio/adc/ad7606_spi.c
@@ -21,7 +21,8 @@ static int ad7606_spi_read_block(struct device *dev,
 {
 	struct spi_device *spi = to_spi_device(dev);
 	int i, ret;
-	unsigned short *data = buf;
+	unsigned short *data;
+	__be16 *bdata = buf;
 
 	ret = spi_read(spi, buf, count * 2);
 	if (ret < 0) {
@@ -30,7 +31,7 @@ static int ad7606_spi_read_block(struct device *dev,
 	}
 
 	for (i = 0; i < count; i++)
-		data[i] = be16_to_cpu(data[i]);
+		data[i] = be16_to_cpu(bdata[i]);
 
 	return 0;
 }
-- 
1.9.1

Re: [PATCH] Staging: iio: Fix sparse endian warning

[Jonathan Cameron]

On 23/03/16 11:06, Ksenija Stanojevic wrote:
> Fix following sparse warning:
> warning: cast to restricted __be16
> 
> Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
Subject amended to include the driver name.  I do tend to let some through
without whilst being lazy, but it really should give a hint of the scope
of the patch.  I'll be more vigorous about this in future!

Applied to the togreg branch of iio.git, initially pushed out as staging
for the autobuilders to play with it.

Thanks,

Jonathan
> ---
>  drivers/staging/iio/adc/ad7606_spi.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/staging/iio/adc/ad7606_spi.c b/drivers/staging/iio/adc/ad7606_spi.c
> index d873a51..825da07 100644
> --- a/drivers/staging/iio/adc/ad7606_spi.c
> +++ b/drivers/staging/iio/adc/ad7606_spi.c
> @@ -21,7 +21,8 @@ static int ad7606_spi_read_block(struct device *dev,
>  {
>  	struct spi_device *spi = to_spi_device(dev);
>  	int i, ret;
> -	unsigned short *data = buf;
> +	unsigned short *data;
> +	__be16 *bdata = buf;
>  
>  	ret = spi_read(spi, buf, count * 2);
>  	if (ret < 0) {
> @@ -30,7 +31,7 @@ static int ad7606_spi_read_block(struct device *dev,
>  	}
>  
>  	for (i = 0; i < count; i++)
> -		data[i] = be16_to_cpu(data[i]);
> +		data[i] = be16_to_cpu(bdata[i]);
>  
>  	return 0;
>  }
> 

Re: [PATCH] Staging: iio: Fix sparse endian warning

[Geert Uytterhoeven]

Hi Ksenija, Greg,

On Wed, Mar 23, 2016 at 12:06 PM, Ksenija Stanojevic
<ksenija.stanojevic@gmail.com> wrote:
> Fix following sparse warning:
> warning: cast to restricted __be16

Please include line number information so we know which line sparse
complains about.

> Signed-off-by: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
> ---
>  drivers/staging/iio/adc/ad7606_spi.c | 5 +++--
>  1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/iio/adc/ad7606_spi.c b/drivers/staging/iio/a=
dc/ad7606_spi.c
> index d873a51..825da07 100644
> --- a/drivers/staging/iio/adc/ad7606_spi.c
> +++ b/drivers/staging/iio/adc/ad7606_spi.c
> @@ -21,7 +21,8 @@ static int ad7606_spi_read_block(struct device *dev,
>  {
>         struct spi_device *spi =3D to_spi_device(dev);
>         int i, ret;
> -       unsigned short *data =3D buf;
> +       unsigned short *data;
> +       __be16 *bdata =3D buf;
>
>         ret =3D spi_read(spi, buf, count * 2);
>         if (ret < 0) {
> @@ -30,7 +31,7 @@ static int ad7606_spi_read_block(struct device *dev,
>         }
>
>         for (i =3D 0; i < count; i++)
> -               data[i] =3D be16_to_cpu(data[i]);
> +               data[i] =3D be16_to_cpu(bdata[i]);

This patch is completely bogus:

drivers/staging/iio/adc/ad7606_spi.c: In function =E2=80=98ad7606_spi_read_=
block=E2=80=99:
drivers/staging/iio/adc/ad7606_spi.c:34: warning: =E2=80=98data=E2=80=99 is=
 used uninitialized
in this function

Hence please revert commit 87787e5ef727ff15f7c552cc48823b469f2eb41b
Author: Ksenija Stanojevic <ksenija.stanojevic@gmail.com>
Date:   Wed Mar 23 12:06:34 2016 +0100

    Staging: iio: Fix sparse endian warning

BTW, what version of sparse are you using?
My (Ubuntu) version of sparse didn't complain about the original, neither d=
oes
the one I've just cloned from the master repository
(v0.5.0-44-g40791b94c56b1a6d)?

Hence I have no idea if fixing this by keeping the assignment of buf to dat=
a
is warned about....

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k=
.org

In personal conversations with technical people, I call myself a hacker. Bu=
t
when I'm talking to journalists I just say "programmer" or something like t=
hat.
                                -- Linus Torvalds