linux-kernel - Re: [PATCH v4 2/3] net/9p/usbg: Add new usb gadget function transport

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Date: Thu, 16 May 2024 21:51:29 +0200
From: Michael Grzeschik <mgr@...gutronix.de>
To: Andrzej Pietrasiewicz <andrzej.p@...labora.com>
Cc: Eric Van Hensbergen <ericvh@...nel.org>,
	Latchesar Ionkov <lucho@...kov.net>,
	Dominique Martinet <asmadeus@...ewreck.org>,
	Christian Schoenebeck <linux_oss@...debyte.com>,
	Jonathan Corbet <corbet@....net>,
	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	v9fs@...ts.linux.dev, linux-doc@...r.kernel.org,
	linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org,
	kernel@...gutronix.de
Subject: Re: [PATCH v4 2/3] net/9p/usbg: Add new usb gadget function transport

On Thu, May 16, 2024 at 08:49:02PM +0200, Michael Grzeschik wrote:
>Hi
>
>On Fri, May 10, 2024 at 04:11:27PM +0200, Andrzej Pietrasiewicz wrote:
>>W dniu 10.05.2024 o 12:11, Michael Grzeschik pisze:
>>>On Fri, May 10, 2024 at 11:25:47AM +0200, Andrzej Pietrasiewicz wrote:
>>>>Hi Michael,
>>>>
>>>>W dniu 30.04.2024 o 01:33, Michael Grzeschik pisze:
>>>>>Add the new gadget function for 9pfs transport. This function is
>>>>>defining an simple 9pfs transport interface that consists of one in and
>>>>>one out endpoint. The endpoints transmit and receive the 9pfs protocol
>>>>>payload when mounting a 9p filesystem over usb.
>>>>>
>>>>>Signed-off-by: Michael Grzeschik <m.grzeschik@...gutronix.de>
>>>>>
>>>>>---
>>>>>v3 -> v4:
>>>>>  - implemented conn_cancel
>>>>
>>>>I tried this scenario:
>>>>
>>>>1) run all the components and have 9pfs up and running
>>>>2) stop the forwarder
>>>>3) umount -f at the gadget side - this indeed succeeds now in v4
>>>>4) start the forwarder again
>>>>5) mount at the gadget side - this hangs.
>>>>
>>>>Did this scenario work for you?
>>>
>>>I actually tested this exact scenario. So this is
>>>suprising. I will try this again just to be sure
>>>that I did send the latest version.
>>>
>>>My latest testsetup included the dummy_hcd. Did you test on real hardware?
>>
>>Yes, I did.
>
>I just also tested this again on real hardware. With the imx6 chipidea
>udc I indeed see that this is stuck after the first round of mount and
>remount. With the musb core on the beaglebone this seems to be fine.
>
>While debugging this I also ran into some shutdown issues and lockdep
>issues I see because the complete handler is possible to be resumed
>immedeatly on musb, which is odd. However I fixed/fix them and send an
>v5 afterwards.
>
>Regarding the hang on the imx6, which hardware did you test this on?

Nevermind. I can also reproduce the hang with the musb.

Michael

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