linux-kernel - Re: [PATCH] staging: rtl8723au: Fix sparse warning: cast to restricted _

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Date:	Thu, 06 Aug 2015 08:21:51 -0400
From:	Jes Sorensen <Jes.Sorensen@...hat.com>
To:	Johannes Postma <jgmpostma@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-wireless@...r.kernel.org,
	devel@...verdev.osuosl.org,
	Larry Finger <Larry.Finger@...inger.net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: Re: [PATCH] staging: rtl8723au: Fix sparse warning: cast to restricted __le16

Johannes Postma <jgmpostma@...il.com> writes:
> usPtr is used as __le16 *, but was defined as u16 *.
> This was reported by sparse as:
> drivers/staging/rtl8723au/hal/rtl8723a_hal_init.c:1850:29: warning: cast to
> restricted __le16
>
> This patch fixes the type of usPtr.
>
> Signed-off-by: Johannes Postma <jgmpostma@...il.com>
> ---
>  drivers/staging/rtl8723au/hal/rtl8723a_hal_init.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)

Looks OK to me. Probably worth changing the *(usPtr + index) to be
usPtr[index] as well to make the code easier to read.

Jes

> diff --git a/drivers/staging/rtl8723au/hal/rtl8723a_hal_init.c b/drivers/staging/rtl8723au/hal/rtl8723a_hal_init.c
> index cb5076a..eb76ac4 100644
> --- a/drivers/staging/rtl8723au/hal/rtl8723a_hal_init.c
> +++ b/drivers/staging/rtl8723au/hal/rtl8723a_hal_init.c
> @@ -1838,7 +1838,7 @@ Hal_EfuseParseThermalMeter_8723A(struct rtw_adapter *padapter,
>  
>  static void rtl8723a_cal_txdesc_chksum(struct tx_desc *ptxdesc)
>  {
> -	u16 *usPtr = (u16 *) ptxdesc;
> +	__le16 *usPtr = (__le16 *)ptxdesc;
>  	u32 count = 16;		/*  (32 bytes / 2 bytes per XOR) => 16 times */
>  	u32 index;
>  	u16 checksum = 0;
--
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