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Message-Id: <200906111557.49490.oliver@neukum.org> Date: Thu, 11 Jun 2009 15:57:48 +0200 From: Oliver Neukum <oliver@...kum.org> To: "Rafael J. Wysocki" <rjw@...k.pl> Cc: Alan Stern <stern@...land.harvard.edu>, linux-pm@...ts.linux-foundation.org, ACPI Devel Maling List <linux-acpi@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org> Subject: Re: [patch update] Re: [linux-pm] Run-time PM idea (was: Re: [RFC][PATCH 0/2] PM: Rearrange core suspend code) Am Donnerstag, 11. Juni 2009 15:48:33 schrieb Rafael J. Wysocki: > > > But after pm_request_resume() returns there's no means to make sure > > > nothing alters it back to RPM_SUSPENDED. The workqueue doesn't help > > > you because you've scheduled nothing by that time. The suspension will > > > work because C is still in RPM_SUSPENDED. > > > > This is an example where usage counters come in handy. > > Do you mean we can count suspend/resume requests for a device? No, we count reasons a device cannot be suspended. Drivers are allowed to add their own reasons. The core uses that mechanism to indicate that an ongoing resumption lower down is also a reason. The count going to zero is equivalent to a request to suspend. Regards Oliver -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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