linux-kernel - Re: [PATCH] usb: musb: Force-disable pullup on shutdown

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Message-ID: <20190401171725.GK25852@uda0271908>
Date:   Mon, 1 Apr 2019 12:17:25 -0500
From:   Bin Liu <b-liu@...com>
To:     Paul Cercueil <paul@...pouillou.net>
CC:     <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <od@...c.me>
Subject: Re: [PATCH] usb: musb: Force-disable pullup on shutdown

On Thu, Mar 21, 2019 at 03:42:46PM +0100, Paul Cercueil wrote:
> When the musb is shutdown, for instance when the driver is unloaded,
> force-disable the pullup. Otherwise, the host will still see the gadget
> device even after the shutdown.

how would this happen?

when musb-hdrc driver is unloaded, udc core removes the bound gadget
driver which calls musb_gadget_pullup() to disable the pullup.

Regards,
-Bin.