linux-kernel - Re: [PATCH] usb: gadget: f_uac2: fix endianness of 'struct cntrl_*

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Date:   Fri, 6 Jul 2018 13:42:18 +0200
From:   Eugeniu Rosca <erosca@...adit-jv.com>
To:     Ruslan Bilovol <ruslan.bilovol@...il.com>
CC:     Eugeniu Rosca <roscaeugeniu@...il.com>,
        Felipe Balbi <balbi@...nel.org>,
        Felipe Balbi <felipe.balbi@...ux.intel.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Vincent Pelletier <plr.vincent@...il.com>,
        <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        Eugeniu Rosca <erosca@...adit-jv.com>
Subject: Re: [PATCH] usb: gadget: f_uac2: fix endianness of 'struct
 cntrl_*_lay3'

Hello Ruslan,

On Tue, Jul 03, 2018 at 01:36:17AM +0300, Ruslan Bilovol wrote:
> On Tue, Jul 3, 2018 at 12:46 AM, Eugeniu Rosca <roscaeugeniu@...il.com> wrote:
> > The list [1] of commits doing endianness fixes in USB subsystem is long
> > due to below quote from USB spec Revision 2.0 from April 27, 2000:
> >
> > ------------
> > 8.1 Byte/Bit Ordering
> >
> > Multiple byte fields in standard descriptors, requests, and responses
> > are interpreted as and moved over the bus in little-endian order, i.e.
> > LSB to MSB.
> > ------------
> >
> > This commit belongs to the same family.
> >
> > [1] Example of endianness fixes in USB subsystem:
> > commit 14e1d56cbea6 ("usb: gadget: f_uac2: endianness fixes.")
> > commit 42370b821168 ("usb: gadget: f_uac1: endianness fixes.")
> > commit 63afd5cc7877 ("USB: chaoskey: fix Alea quirk on big-endian hosts")
> > commit 74098c4ac782 ("usb: gadget: acm: fix endianness in notifications")
> > commit cdd7928df0d2 ("ACM gadget: fix endianness in notifications")
> > commit 323ece54e076 ("cdc-wdm: fix endianness bug in debug statements")
> > commit e102609f1072 ("usb: gadget: uvc: Fix endianness mismatches")
> >        list goes on
> >
> > Fixes: 132fcb460839 ("usb: gadget: Add Audio Class 2.0 Driver")
> > Signed-off-by: Eugeniu Rosca <erosca@...adit-jv.com>
> 
> Good catch!
> 
> Reviewed-by: Ruslan Bilovol <ruslan.bilovol@...il.com>

Thanks for the review. FWIW, I've accidentally noticed post-push that
a similar fix has been incorporated by you in the UAC3 implementation
from https://lkml.org/lkml/2017/11/6/1514 ("[PATCH 1/1] usb: gadget: add
USB Audio Device Class 3.0 gadget support").

Best regards,
Eugeniu.