Re: [PATCH] staging: rtl8188eu: Replace a custom function with crc32_le()

From: "Fabio M. De Francesco" <fmdefrancesco@gmail.com>
To: Larry Finger <Larry.Finger@lwfinger.net>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	"linux-staging@lists.linux.dev" <linux-staging@lists.linux.dev>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	Al Viro <viro@zeniv.linux.org.uk>,
	David Laight <David.Laight@aculab.com>
Subject: Re: [PATCH] staging: rtl8188eu: Replace a custom function with crc32_le()
Date: Thu, 01 Jul 2021 18:10:08 +0200	[thread overview]
Message-ID: <1769059.L4xhdxBWhX@linux.local> (raw)
In-Reply-To: <190cf86a4b8a40d2b672327e26cceace@AcuMS.aculab.com>

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
> 
> -
> Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 
1PT, UK
> Registration No: 1397386 (Wales)