linux-kernel - Re: [PATCH] staging: rtl8188eu: Replace a custom function with crc32

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Message-ID: <1769059.L4xhdxBWhX@linux.local>
Date:   Thu, 01 Jul 2021 18:10:08 +0200
From:   "Fabio M. De Francesco" <fmdefrancesco@...il.com>
To:     Larry Finger <Larry.Finger@...inger.net>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "linux-staging@...ts.linux.dev" <linux-staging@...ts.linux.dev>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        David Laight <David.Laight@...lab.com>
Subject: Re: [PATCH] staging: rtl8188eu: Replace a custom function with crc32_le()

On Thursday, July 1, 2021 5:54:49 PM CEST David Laight wrote:
> From: Fabio M. De Francesco
> 
> > Sent: 01 July 2021 16:24
> > 
> > On Thursday, July 1, 2021 4:52:08 PM CEST David Laight wrote:
> > 
> > > From: Fabio M. De Francesco
> > >
> > >
> > >
> > > > Sent: 01 July 2021 14:38
> > > >
> > > >
> > > >
> > > > Use crc32_le in place of the custom getcrc32. This change makes GCC
> > > > to warn about incorrect castings to the restricted type __le32, but
> > > > they can be safely ignored because crc32_le calculates bitwise
> > > > little-endian Ethernet AUTODIN II CRC32.
> > >
> > >
> > >
> > > ...
> > >
> > >
> > >
> > > > -					*((__le32 *)crc) =
> > 
> > getcrc32(payload, length);/* modified by Amy*/
> > 
> > > > +					*((__le32 *)crc) =
> > 
> > ~crc32_le(~0, payload, length);
> > 
> > >
> > >
> > > Haven't we been round this before?
> > >
> > >
> > 
> > No, I don't think so. At least, not you and I.
> > 
> 
> 
> That was rt1872 this is rtl8188 but I think it is the same crap.
>
Perhaps it is the same crap... However, the patch is in accordance to one of 
the two solution that Al Viro wrote about.

I think I'll leave the patch as is and wait for the final review by Greg K-H.

Thanks,

Fabio
> 
> 	David
> 
> -
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