linux-kernel - Re: [PATCH] HID: usbhid: get/put around clearing needs_remote

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Message-ID: <CANLzEkuZYrF_tLq5k3xBBkSmtszL851ZK7VW8Jav3vKdw9JLMA@mail.gmail.com>
Date:	Mon, 24 Nov 2014 17:29:42 -0800
From:	Benson Leung <bleung@...omium.org>
To:	Alan Stern <stern@...land.harvard.edu>
Cc:	johan@...nel.org, Jiri Kosina <jkosina@...e.cz>,
	linux-usb@...r.kernel.org,
	"linux-input@...r.kernel.org" <linux-input@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Sameer Nanda <snanda@...omium.org>
Subject: Re: [PATCH] HID: usbhid: get/put around clearing needs_remote_wakeup

Hi Alan,


On Sat, Nov 22, 2014 at 7:55 AM, Alan Stern <stern@...land.harvard.edu> wrote:
> There is no USB wrapper for pm_runtime_idle calls, but one could be
> added.  Still, in the meantime can you check to see what happens if you
> add
>
>         pm_runtime_idle(&usbhid->intf->dev);
>
> in usbhid_close() just after needs_remote_wakeup is set to 0?  You can
> do the same thing in usbhid_stop() if you want.

I tried using this in lieu of usb_autopm_get/put_interface:

    usbhid->intf->needs_remote_wakeup = 0;
    pm_runtime_idle(&usbhid->intf->dev);
    pm_runtime_idle(usbhid->intf->dev.parent);

It did not work. I see the autosuspend_check() that was kicked off as
a result of hid_hw_power, which falls into the "remote wakeup needed
for autosuspend" branch, but I don't see another autosuspend_check()
that picks up the updated value of  needs_remote_wakeup.

-- 
Benson Leung
Software Engineer, Chrom* OS
bleung@...omium.org
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