linux-kernel - RE: [PATCH v2 3/4] usb: aspeed-vhub: fix ep0 OUT ack received wrong length issue

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Date:   Wed, 1 Dec 2021 02:17:01 +0000
From:   Neal Liu <neal_liu@...eedtech.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     Felipe Balbi <balbi@...nel.org>, Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Cai Huoqing <caihuoqing@...du.com>,
        Tao Ren <rentao.bupt@...il.com>,
        Julia Lawall <julia.lawall@...ia.fr>,
        kernel test robot <lkp@...el.com>,
        Sasha Levin <sashal@...nel.org>,
        "linux-usb@...r.kernel.org" <linux-usb@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        BMC-SW <BMC-SW@...eedtech.com>,
        Benjamin Herrenschmidt <benh@...nel.crashing.org>
Subject: RE: [PATCH v2 3/4] usb: aspeed-vhub: fix ep0 OUT ack received wrong
 length issue

> -----Original Message-----
> From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
> Sent: Tuesday, November 30, 2021 7:47 PM
> To: Neal Liu <neal_liu@...eedtech.com>
> Cc: Felipe Balbi <balbi@...nel.org>; Joel Stanley <joel@....id.au>; Andrew
> Jeffery <andrew@...id.au>; Cai Huoqing <caihuoqing@...du.com>; Tao Ren
> <rentao.bupt@...il.com>; Julia Lawall <julia.lawall@...ia.fr>; kernel test
> robot <lkp@...el.com>; Sasha Levin <sashal@...nel.org>;
> linux-usb@...r.kernel.org; linux-kernel@...r.kernel.org;
> linux-arm-kernel@...ts.infradead.org; linux-aspeed@...ts.ozlabs.org; BMC-SW
> <BMC-SW@...eedtech.com>; Benjamin Herrenschmidt
> <benh@...nel.crashing.org>
> Subject: Re: [PATCH v2 3/4] usb: aspeed-vhub: fix ep0 OUT ack received wrong
> length issue
> 
> On Tue, Nov 30, 2021 at 06:42:55PM +0800, Neal Liu wrote:
> > If multiple devices in vhub are enumerated simultaneously, ep0 OUT ack
> > might received wrong data length. Using expected data length instead.
> >
> > Acked-by: Benjamin Herrenschmidt <benh@...nel.crashing.org>
> > Signed-off-by: Neal Liu <neal_liu@...eedtech.com>
> > ---
> >  drivers/usb/gadget/udc/aspeed-vhub/ep0.c | 7 +++++++
> >  1 file changed, 7 insertions(+)
> >
> > diff --git a/drivers/usb/gadget/udc/aspeed-vhub/ep0.c
> > b/drivers/usb/gadget/udc/aspeed-vhub/ep0.c
> > index 74ea36c19b1e..bea9cbb191a2 100644
> > --- a/drivers/usb/gadget/udc/aspeed-vhub/ep0.c
> > +++ b/drivers/usb/gadget/udc/aspeed-vhub/ep0.c
> > @@ -251,6 +251,13 @@ static void ast_vhub_ep0_do_receive(struct
> ast_vhub_ep *ep, struct ast_vhub_req
> >  		len = remain;
> >  		rc = -EOVERFLOW;
> >  	}
> > +
> > +	/* HW return wrong data len */
> 
> Please spell out "Hardware"?
> 
> thanks,
> 
> greg k-h

Sure, I'll fix it in next patch.
Thanks

Best Regards,
-Neal