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Date: Wed, 9 Jan 2008 16:01:48 -0500 (EST) From: Alan Stern <stern@...land.harvard.edu> To: "Rafael J. Wysocki" <rjw@...k.pl> cc: Johannes Berg <johannes@...solutions.net>, Greg KH <gregkh@...e.de>, Andrew Morton <akpm@...ux-foundation.org>, Len Brown <lenb@...nel.org>, Ingo Molnar <mingo@...e.hu>, ACPI Devel Maling List <linux-acpi@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, pm list <linux-pm@...ts.linux-foundation.org> Subject: Re: [PATCH] PM: Acquire device locks on suspend On Tue, 8 Jan 2008, Rafael J. Wysocki wrote: > Appended is what I managed to put together today. > > It probably still has some problems, but I'm not seeing them right now (too > tired). At least, it doesn't break my system. ;-) > > Please review. Okay, this seems to be better. I like the way the complicated tests are all localized in power/main.c. In dpm_resume() you shouldn't need to use dpm_list_mtx at all, because the list_move_tail() comes before the resume_device(). It's the same as in dpm_power_up(). The same is true for dpm_suspend(). Once all the device have been locked, there shouldn't be any other tasks accessing the dpm lists. Hence there should be no need to protect the list. Which reminds me, the kerneldoc for device_pm_schedule_removal() is inaccurate. The routine always just moves the device to dpm_destroy list for later processing. Also, the kerneldoc for destroy_suspended_device() should contain an extra paragraph warning that the routine should never be called except within the scope of a system sleep transition. In practice this means it has to be directly or indirectly invoked by a suspend or resume method. It looks good. Alan Stern -- 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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