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Re: [PATCH] PM: Acquire device locks on suspend

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From: Alan Stern <stern@...>
To: Rafael J. Wysocki <rjw@...>
Cc: Greg KH <gregkh@...>, Andrew Morton <akpm@...>, Len Brown <lenb@...>, Ingo Molnar <mingo@...>, ACPI Devel Maling List <linux-acpi@...>, LKML <linux-kernel@...>, pm list <linux-pm@...>
Subject: Re: [PATCH] PM: Acquire device locks on suspend
Date: Sunday, January 6, 2008 - 6:31 pm

On Sun, 6 Jan 2008, Rafael J. Wysocki wrote:


We could, however I don't think it's dangerous to allow it.  The two
problems to avoid are (1) messing up the PM device list pointers, and
(2) calling a driver's suspend/resume methods while its remove method
is running.  (1) is handled by the pm_list_mutex and (2) is handled by
locking dev->sem.

Alan Stern

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Messages in current thread:
[PATCH] PM: Acquire device locks on suspend, Rafael J. Wysocki, (Sat Jan 5, 2:36 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Alan Stern, (Sat Jan 5, 4:08 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Rafael J. Wysocki, (Sat Jan 5, 4:19 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Alan Stern, (Sat Jan 5, 4:39 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Rafael J. Wysocki, (Sat Jan 5, 5:13 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Alan Stern, (Sat Jan 5, 5:41 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Rafael J. Wysocki, (Sat Jan 5, 5:58 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Alan Stern, (Sun Jan 6, 12:04 am)
Re: [PATCH] PM: Acquire device locks on suspend, Rafael J. Wysocki, (Sun Jan 6, 9:19 am)
Re: [PATCH] PM: Acquire device locks on suspend, Alan Stern, (Sun Jan 6, 1:06 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Rafael J. Wysocki, (Sun Jan 6, 3:05 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Alan Stern, (Sun Jan 6, 6:11 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Rafael J. Wysocki, (Sun Jan 6, 6:24 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Alan Stern, (Sun Jan 6, 6:31 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Rafael J. Wysocki, (Sun Jan 6, 3:57 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Alan Stern, (Sun Jan 6, 6:21 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Rafael J. Wysocki, (Sun Jan 6, 6:34 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Alan Stern, (Sun Jan 6, 6:39 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Rafael J. Wysocki, (Sun Jan 6, 6:47 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Alan Stern, (Mon Jan 7, 12:16 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Rafael J. Wysocki, (Mon Jan 7, 12:51 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Alan Stern, (Mon Jan 7, 1:23 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Rafael J. Wysocki, (Mon Jan 7, 2:01 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Alan Stern, (Mon Jan 7, 3:29 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Rafael J. Wysocki, (Mon Jan 7, 4:37 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Alan Stern, (Mon Jan 7, 5:32 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Rafael J. Wysocki, (Mon Jan 7, 8:25 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Alan Stern, (Wed Jan 9, 5:01 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Rafael J. Wysocki, (Wed Jan 9, 6:14 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Alan Stern, (Wed Jan 9, 6:46 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Rafael J. Wysocki, (Wed Jan 9, 7:29 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Alan Stern, (Thu Jan 10, 11:35 am)
Re: [PATCH] PM: Acquire device locks on suspend, Rafael J. Wysocki, (Thu Jan 10, 12:59 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Alan Stern, (Thu Jan 10, 1:04 pm)
Re: [PATCH] PM: Acquire device locks on suspend, Rafael J. Wysocki, (Sun Jan 6, 6:19 pm)