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From: Oliver Neukum <oneukum-l3A5Bk7waGM@public.gmane.org>
To: stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org
Cc: linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	linux-input-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Subject: need to get the interface cycled with autopm_get/_put() to let a device sleep
Date: Wed, 15 Apr 2015 16:33:48 +0200	[thread overview]
Message-ID: <1429108428.31093.12.camel@suse.de> (raw)

Hi,

I found a problem with the close() function of usbhid.
It fails to properly suspend device that don't support
remote wake-up. The power core does not retry an autosuspend
that failed due to a lack of support for remote wake-up.

So there needs to be a _put() if the need for remote wake-up
is rescinded. The current state of affairs leads to joysticks
never going to sleep again after use.

But I am not happy with the simple solution. It needlessly
wakes up suspended devices. So, I tried using
usb_autopm_get_interface_no_resume(). To my considerable
surprise that didn't work. I cannot understand why.

So what is to be done?

	Regards
		Oliver


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             reply	other threads:[~2015-04-15 14:33 UTC|newest]

Thread overview: 2+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-04-15 14:33 Oliver Neukum [this message]
2015-04-15 15:07 ` need to get the interface cycled with autopm_get/_put() to let a device sleep Alan Stern

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