Re: [PATCH v2] usb: dwc3: avoid NULL access of usb_gadget_driver

On Tue, Jun 29, 2021 at 09:51:18AM +0800, Linyu Yuan wrote:

we found crash in dwc3_disconnect_gadget(),
it is because dwc->gadget_driver become NULL before async access.
7dc0c55e9f30 ('USB: UDC core: Add udc_async_callbacks gadget op')
suggest a common way to avoid such kind of issue.

this change implment the callback in dwc3 and
change related functions which have callback to usb gadget driver.

Signed-off-by: Linyu Yuan <redacted>
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v2: add missing check in dwc3_reset_gadget(), found by Alan Stern.

This is better.

Acked-by: Alan Stern <stern@rowland.harvard.edu>