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Date:   Fri, 12 Feb 2021 20:00:25 +0530
From:   Anirudh Rayabharam <mail@anirudhrb.com>
To:     Greg KH <gregkh@linuxfoundation.org>
Cc:     lee.jones@linaro.org, kuba@kernel.org, johannes@sipsolutions.net,
        colin.king@canonical.com, arnd@arndb.de,
        devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] staging: wimax/i2400m: fix some byte order issues found
 by sparse
Message-ID: <YCaRAYjiz0TJH+4L@anirudhrb.com>
References: <20210211202908.4604-1-mail@anirudhrb.com>
 <YCWVD34rU5Lu71/S@kroah.com>
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On Thu, Feb 11, 2021 at 09:35:27PM +0100, Greg KH wrote:
> 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@anirudhrb.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.
> 
But that throws a compile error. Also, I don't see le32 defined
in any common header. It is defined in fs/ntfs/types.h but that's not
accessible here.

> >  		const u32 *checksum_ptr = (void *) cmd->payload;
> 
> Add a blank line here, right?
It wasn't there before but makes sense. I'll send v2 with this change.

Thanks!

	- Anirudh.