linux-kernel - Re: [PATCH] staging: comedi: usbdux: fix sparse endianness warnings

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Date:	Sat, 30 Aug 2014 11:40:51 +0100
From:	Ian Abbott <abbotti@....co.uk>
To:	Chase Southwood <chase.southwood@...il.com>,
	<gregkh@...uxfoundation.org>
CC:	<hsweeten@...ionengravers.com>, <devel@...verdev.osuosl.org>,
	<linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] staging: comedi: usbdux: fix sparse endianness warnings

On 30/08/14 02:40, Chase Southwood wrote:
> Sparse has many warnings like:
>
> drivers/staging/comedi/drivers/usbdux.c:366:32: warning: cast to
> restricted __le16
>
> on lines on which devpriv->in_buf or devpriv->insn_buf are passed to
> le16_to_cpu().  This suggests that both of these variables should actually
> be of type __le16.
>
> Signed-off-by: Chase Southwood <chase.southwood@...il.com>
> Cc: Ian Abbott <abbotti@....co.uk>
> Cc: H Hartley Sweeten <hsweeten@...ionengravers.com>
> ---
> This is, as usual, compile tested only.  I tried to verify as best as I
> could that this is a sane change, but I am unable to test on the hardware.
>
>   drivers/staging/comedi/drivers/usbdux.c | 4 ++--
>   1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/comedi/drivers/usbdux.c b/drivers/staging/comedi/drivers/usbdux.c
> index 053bc50..e1a19222 100644
> --- a/drivers/staging/comedi/drivers/usbdux.c
> +++ b/drivers/staging/comedi/drivers/usbdux.c
> @@ -198,9 +198,9 @@ struct usbdux_private {
>   	/* size of the PWM buffer which holds the bit pattern */
>   	int pwm_buf_sz;
>   	/* input buffer for the ISO-transfer */
> -	uint16_t *in_buf;
> +	__le16 *in_buf;
>   	/* input buffer for single insn */
> -	uint16_t *insn_buf;
> +	__le16 *insn_buf;
>
>   	unsigned int ao_readback[USBDUX_NUM_AO_CHAN];
>
>

That seems fine.  Perhaps the variable 'p' in usbdux_ao_insn_write() 
should also be of type '__le16 *'?

Reviewed-by: Ian Abbott <abbotti@....co.uk>

-- 
-=( Ian Abbott @ MEV Ltd.    E-mail: <abbotti@....co.uk>        )=-
-=( Tel: +44 (0)161 477 1898   FAX: +44 (0)161 718 3587         )=-
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