linux-kernel - Re: [PATCH] dwc3: gadget: Introduce dwc3_endpoint_xfer

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Message-ID: <87eg8pqqwx.fsf@linux.intel.com>
Date:	Thu, 26 May 2016 09:22:54 +0300
From:	Felipe Balbi <balbi@...nel.org>
To:	Baolin Wang <baolin.wang@...aro.org>, gregkh@...uxfoundation.org
Cc:	broonie@...nel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org, baolin.wang@...aro.org
Subject: Re: [PATCH] dwc3: gadget: Introduce dwc3_endpoint_xfer_xxx() to check endpoint type


Hi,

Baolin Wang <baolin.wang@...aro.org> writes:
> When handling the endpoint interrupt handler, it maybe disable the endpoint
> from another core user to set the USB endpoint descriptor pointor to be NULL
> while issuing usb_gadget_giveback_request() function to release lock. So it
> will be one bug to check the endpoint type by usb_endpoint_xfer_xxx() APIs with
> one NULL USB endpoint descriptor.

too complex, Baolin :-) Can you see if this helps:

https://git.kernel.org/cgit/linux/kernel/git/balbi/usb.git/commit/?id=88bf752cfb55e57a78e27c931c9fef63240c739a

The only situation when that can happen is while we drop our lock on
dwc3_gadget_giveback().

-- 
balbi

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