Re: [PATCH] usb: gadget: f_uac2: fixup feedback endpoint stop

On Fri 27 Aug 2021 at 11:05, Felipe Balbi [off-list ref] wrote:

Hi,

Jerome Brunet [off-list ref] writes:

quoted

When the uac2 function is stopped, there seems to be an issue reported on
some platforms (Intel Merrifield at least)

BUG: kernel NULL pointer dereference, address: 0000000000000008
...
RIP: 0010:dwc3_gadget_del_and_unmap_request+0x19/0xe0
...
Call Trace:
 dwc3_remove_requests.constprop.0+0x12f/0x170
 __dwc3_gadget_ep_disable+0x7a/0x160
 dwc3_gadget_ep_disable+0x3d/0xd0
 usb_ep_disable+0x1c/0x70
 u_audio_stop_capture+0x79/0x120 [u_audio]
 afunc_set_alt+0x73/0x80 [usb_f_uac2]
 composite_setup+0x224/0x1b90 [libcomposite]

The issue happens only when the gadget is using the sync type "async", not
"adaptive". This indicates that problem is coming from the feedback
endpoint, which is only used with async synchronization mode.

The problem is that request is freed regardless of usb_ep_dequeue(), which
ends up badly if the request is not actually dequeued yet.

Update the feedback endpoint free function to release the endpoint the same
way it is done for the data endpoint, which takes care of the problem.

Reported-by: Ferry Toth <redacted>
Tested-by: Ferry Toth <redacted>
Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
---
 Hi Felipe,

 This solves the issue reported here [0] and makes revert [1]
 unnecessary.

awesome work! Thanks

Acked-by: Felipe Balbi <balbi@kernel.org>

Forgot the fixes tag

Fixes: 24f779dac8f3 ("usb: gadget: f_uac2/u_audio: add feedback endpoint support")