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From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: linux-sh@vger.kernel.org
Cc: Linux PM mailing list <linux-pm@lists.linux-foundation.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Magnus Damm <magnus.damm@gmail.com>
Subject: [PATCH 0/2] sh-sci / PM: Fix problem with runtime PM callbacks run with interrupts off
Date: Sat, 20 Aug 2011 21:31:19 +0200	[thread overview]
Message-ID: <201108202131.19479.rjw@sisk.pl> (raw)

Hi,

The sh-sci driver uses pm_runtime_get/put_sync() in such a way
that they may be run with interrupts off and cause the (recently
added) might_sleep_if() to trigger in rpm_suspend/resume().

To avoid that, it's necessary to set the SCI device's power.irq_safe
flag to indicate that it's runtime PM callbacks may be executed with
interrupts off safely.  However, the sh-sci driver needs to be able to
clear that flag sometimes, so a new runtime PM helper for doing that
is needed.

[1/2] - Add pm_runtime_irq_unsafe() for clearing the power.irq_safe device flag.
[2/2] - Make sh-sci use power.irq_safe to indicate that runtime PM callbacks
        may be run with interrupts off.

Thanks,
Rafael


             reply	other threads:[~2011-08-20 19:31 UTC|newest]

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-08-20 19:31 Rafael J. Wysocki [this message]
2011-08-20 19:32 ` [PATCH 1/2] PM / Runtime: Introduce pm_runtime_irq_unsafe() Rafael J. Wysocki
2011-08-21 14:55   ` [linux-pm] " Alan Stern
2011-08-21 18:09     ` Rafael J. Wysocki
2011-08-20 19:33 ` [PATCH 2/2] sh-sci / PM: Use power.irq_safe Rafael J. Wysocki
2011-08-21 19:09 ` [PATCH 0/2 v2] sh-sci / PM: Fix problem with runtime PM callbacks run with interrupts off Rafael J. Wysocki
2011-08-21 19:10   ` [PATCH 1/2 v2] PM: Change PM subsys_data lock type into spinlock Rafael J. Wysocki
2011-08-22  6:18     ` [Replacement][PATCH 1/2 v2] PM: Use spinlock instead of mutex in clock management functions Rafael J. Wysocki
2011-08-21 19:11   ` [PATCH 2/2 v2] sh-sci / PM: Use power.irq_safe Rafael J. Wysocki
2011-08-24  5:33     ` Paul Mundt
2011-08-24 20:52       ` Rafael J. Wysocki
2011-08-25  1:33         ` Paul Mundt

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