linux-kernel - Re: [PATCH 4/7] staging: wfx: correctly cast data on big-endian targets

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Date:   Tue, 8 Oct 2019 15:01:16 +0300
From:   Dan Carpenter <dan.carpenter@...cle.com>
To:     Jerome Pouiller <Jerome.Pouiller@...abs.com>
Cc:     "devel@...verdev.osuosl.org" <devel@...verdev.osuosl.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Stephen Rothwell <sfr@...b.auug.org.au>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 4/7] staging: wfx: correctly cast data on big-endian
 targets

On Tue, Oct 08, 2019 at 09:43:00AM +0000, Jerome Pouiller wrote:
> From: Jérôme Pouiller <jerome.pouiller@...abs.com>
> 
> When built for a big-endian target, original code caused error:
> 
>     include/uapi/linux/swab.h:242:29: note: expected '__u32 * {aka unsigned int *}' but argument is of type 'struct hif_mib_protected_mgmt_policy *'
> 
> Fixes: f95a29d40782 ("staging: wfx: add HIF commands helpers")
> Reported-by: kbuild test robot <lkp@...el.com>
> Reported-by: Stephen Rothwell <sfr@...b.auug.org.au>
> Signed-off-by: Jérôme Pouiller <jerome.pouiller@...abs.com>
> ---
>  drivers/staging/wfx/hif_tx_mib.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/staging/wfx/hif_tx_mib.h b/drivers/staging/wfx/hif_tx_mib.h
> index 167c5dec009f..4f132348f5fa 100644
> --- a/drivers/staging/wfx/hif_tx_mib.h
> +++ b/drivers/staging/wfx/hif_tx_mib.h
> @@ -145,7 +145,7 @@ static inline int hif_set_mfp(struct wfx_vif *wvif, bool capable, bool required)
>  	}
>  	if (!required)
>  		val.unpmf_allowed = 1;
> -	cpu_to_le32s(&val);
> +	cpu_to_le32s((uint32_t *) &val);

Again, this is fine for now, but in the future there shouldn't be a
space after the cast.  It's to mark that it's a high precedence
operation.

	cpu_to_le32s((uint32_t *)&val);

regards,
dan carpenter