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From: vichy <vichy.kuo@gmail.com>
To: Alan Stern <stern@rowland.harvard.edu>
Cc: linux-pm@vger.kernel.org
Subject: Re: Auto suspend not working on usb hid devices
Date: Tue, 13 Jan 2015 20:11:19 +0800	[thread overview]
Message-ID: <CAOVJa8H9+tDB-arQ8UFJzkOr7W3uhkStSHCxHo1UV+QegqkuZw@mail.gmail.com> (raw)
In-Reply-To: <CAOVJa8GkYnT3MV-jgLhoagUL1N3GhTGooho=pbVr7LcUUWXwvQ@mail.gmail.com>

hi alan:


>> The pm_runtime_put_async_autosuspend() call decrements runtime_usage
>> back to 1.
> I purposely dump runtime_usage after calling
> pm_runtime_put_async_autosuspend(), but the value is still 2.
> I found the value increase/decrease like below:
> pm_runtime_get_noresume => 1
> usb_disable_autosuspend => 2
> usb_probe_device
>     -> usb_autoresume_device => 3
> usb_set_configuration
>     ->usb_autoresume_device =>4
> usb_set_configuration
>     ->usb_autosuspend_device =>3
> pm_runtime_put_sync_autosuspend => 2
>
> so even after calling pm_runtime_put_async_autosuspend() at end fo
> usb_new_device()
> the runtime_usage will not be back to 1

is there any rule for us to determine where we add those
usb_autoresume_device/usb_autosuspend_device in usb driver?

Sincerely appreciate your help,

  reply	other threads:[~2015-01-13 12:11 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-01-11 13:23 Auto suspend not working on usb hid devices vichy
2015-01-11 15:53 ` Alan Stern
2015-01-12 10:45   ` vichy
2015-01-12 12:45     ` vichy
2015-01-12 15:18       ` Alan Stern
2015-01-13  9:35         ` vichy
2015-01-13 12:11           ` vichy [this message]
2015-01-13 15:37           ` Alan Stern
2015-01-16 11:21             ` vichy
2015-01-16 15:23               ` Alan Stern

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