linux-kernel - Re: [PATCH] usb: musb: Call musb_platform_exit from musb

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Date:   Thu, 19 Jul 2018 23:16:18 +0530
From:   Jagan Teki <jagan@...rulasolutions.com>
To:     Bin Liu <b-liu@...com>, Jagan Teki <jagan@...rulasolutions.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        linux-usb@...r.kernel.org,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] usb: musb: Call musb_platform_exit from musb_stop

On Thu, Jul 19, 2018 at 9:07 PM, Bin Liu <b-liu@...com> wrote:
> Hi,
>
> On Thu, Jul 19, 2018 at 03:40:38PM +0530, Jagan Teki wrote:
>> musb stop is musb core call during unregister or shutting down
>> gadget or host musb. For graceful exit add musb_platform_exit
>> on musb_stop so-that it can exit the musb platform driver as well.
>
> Thanks for the patch. but musb_stop() is called in the .udc_stop() and
> host .stop() hooks, which can stop (and restart) at any time by the udc
> or host core, not really during unregister. musb_platform_init() is not
> called in .udc_start() and .start() hooks, so we shouldn't add
> musb_platform_exit() in musb_stop().

Thanks for the explanation.

Look like musb_platform_exit calling during musb_remove call of
platform driver. can you explain how the shutdown sequence happen
because of if udc_stop call musb_stop to shutdown how come
platform_exit will shutdown it's PHY and CLK bits. or is it in
reverse?

Jagan.