From: Oliver Neukum <oliver-GvhC2dPhHPQdnm+yROfE0A@public.gmane.org>
To: Dmitry Torokhov
<dmitry.torokhov-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
Cc: linux-input-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
will-ffEBwZeNOFERmelmmXo44Q@public.gmane.org
Subject: Re: [rft]powermate runtime pm
Date: Fri, 4 Jul 2008 00:13:53 +0200 [thread overview]
Message-ID: <200807040013.54237.oliver@neukum.org> (raw)
In-Reply-To: <200807040008.50174.oliver-GvhC2dPhHPQdnm+yROfE0A@public.gmane.org>
Am Freitag 04 Juli 2008 00:08:49 schrieb Oliver Neukum:
> Mutual exclusion is a very good idea. And telling input devices that
> they are open is also a good idea. But this will be difficult, as open()
> will almost certainly wish to do as memory allocations can trigger
> an autoresume.
Sorry, it is late.
Again, in clear language.
You will face a deadlock problem, as open can call into resume,
due to
a) usb_autopm_get_interface()
b) any memory allocation that triggers autoresumption of another
interface of the same device
Regards
Oliver
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prev parent reply other threads:[~2008-07-03 22:13 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-07-03 15:53 [rft]powermate runtime pm Oliver Neukum
[not found] ` <200807031753.16960.oliver-GvhC2dPhHPQdnm+yROfE0A@public.gmane.org>
2008-07-03 17:43 ` Dmitry Torokhov
2008-07-03 22:08 ` Oliver Neukum
[not found] ` <200807040008.50174.oliver-GvhC2dPhHPQdnm+yROfE0A@public.gmane.org>
2008-07-03 22:13 ` Oliver Neukum [this message]
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