linux-kernel - Re: [PATCH] staging: wimax/i2400m: fix some byte order issues found by sparse

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Date:   Thu, 11 Feb 2021 21:35:27 +0100
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Anirudh Rayabharam <mail@...rudhrb.com>
Cc:     lee.jones@...aro.org, kuba@...nel.org, johannes@...solutions.net,
        colin.king@...onical.com, arnd@...db.de,
        devel@...verdev.osuosl.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] staging: wimax/i2400m: fix some byte order issues found
 by sparse

On Fri, Feb 12, 2021 at 01:59:08AM +0530, Anirudh Rayabharam wrote:
> Fix sparse byte-order warnings in the i2400m_bm_cmd_prepare()
> function:
> 
> wimax/i2400m/fw.c:194:36: warning: restricted __le32 degrades to integer
> wimax/i2400m/fw.c:195:34: warning: invalid assignment: +=
> wimax/i2400m/fw.c:195:34:    left side has type unsigned int
> wimax/i2400m/fw.c:195:34:    right side has type restricted __le32
> wimax/i2400m/fw.c:196:32: warning: restricted __le32 degrades to integer
> wimax/i2400m/fw.c:196:47: warning: restricted __le32 degrades to integer
> wimax/i2400m/fw.c:196:66: warning: restricted __le32 degrades to integer
> 
> Signed-off-by: Anirudh Rayabharam <mail@...rudhrb.com>
> ---
>  drivers/staging/wimax/i2400m/fw.c | 14 +++++++++-----
>  1 file changed, 9 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/staging/wimax/i2400m/fw.c b/drivers/staging/wimax/i2400m/fw.c
> index b2fd4bd2c5f9..bce651a6b543 100644
> --- a/drivers/staging/wimax/i2400m/fw.c
> +++ b/drivers/staging/wimax/i2400m/fw.c
> @@ -189,12 +189,16 @@ void i2400m_bm_cmd_prepare(struct i2400m_bootrom_header *cmd)
>  {
>  	if (i2400m_brh_get_use_checksum(cmd)) {
>  		int i;
> -		u32 checksum = 0;
> +		__le32 checksum = 0;

__le32 is only for when the data crosses the kernel/user boundry, just
use le32 in the kernel for stuff like this.

>  		const u32 *checksum_ptr = (void *) cmd->payload;

Add a blank line here, right?

thanks,

greg k-h