diff mbox series

[v2,3/4] usb: aspeed-vhub: fix ep0 OUT ack received wrong length issue

Message ID 20211130104256.3106797-4-neal_liu@aspeedtech.com
State Superseded
Headers show
Series Refactor Aspeed USB vhub driver | expand

Commit Message

Neal Liu Nov. 30, 2021, 10:42 a.m. UTC
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@kernel.crashing.org>
Signed-off-by: Neal Liu <neal_liu@aspeedtech.com>
---
 drivers/usb/gadget/udc/aspeed-vhub/ep0.c | 7 +++++++
 1 file changed, 7 insertions(+)

Comments

Greg KH Nov. 30, 2021, 11:47 a.m. UTC | #1
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@kernel.crashing.org>
> Signed-off-by: Neal Liu <neal_liu@aspeedtech.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
Neal Liu Dec. 1, 2021, 2:17 a.m. UTC | #2
> -----Original Message-----
> From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Sent: Tuesday, November 30, 2021 7:47 PM
> To: Neal Liu <neal_liu@aspeedtech.com>
> Cc: Felipe Balbi <balbi@kernel.org>; Joel Stanley <joel@jms.id.au>; Andrew
> Jeffery <andrew@aj.id.au>; Cai Huoqing <caihuoqing@baidu.com>; Tao Ren
> <rentao.bupt@gmail.com>; Julia Lawall <julia.lawall@inria.fr>; kernel test
> robot <lkp@intel.com>; Sasha Levin <sashal@kernel.org>;
> linux-usb@vger.kernel.org; linux-kernel@vger.kernel.org;
> linux-arm-kernel@lists.infradead.org; linux-aspeed@lists.ozlabs.org; BMC-SW
> <BMC-SW@aspeedtech.com>; Benjamin Herrenschmidt
> <benh@kernel.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@kernel.crashing.org>
> > Signed-off-by: Neal Liu <neal_liu@aspeedtech.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
diff mbox series

Patch

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 */
+	if (len < ep->ep.maxpacket && len != remain) {
+		EPDBG(ep, "using expected data len instead\n");
+		len = remain;
+	}
+
 	if (len && req->req.buf)
 		memcpy(req->req.buf + req->req.actual, ep->buf, len);
 	req->req.actual += len;