linux-kernel - device_suspend/resume may sleep

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Message-ID: <20060831122021.GX3923@elf.ucw.cz>
Date:	Thu, 31 Aug 2006 14:20:21 +0200
From:	Pavel Machek <pavel@...e.cz>
To:	Andrew Morton <akpm@...l.org>,
	kernel list <linux-kernel@...r.kernel.org>
Subject: device_suspend/resume may sleep


This adds warning when someone tries them from atomic context.

Signed-off-by: Pavel Machek <pavel@...e.cz>

diff --git a/drivers/base/power/resume.c b/drivers/base/power/resume.c
index 826093e..849a069 100644
--- a/drivers/base/power/resume.c
+++ b/drivers/base/power/resume.c
@@ -74,6 +74,7 @@ void dpm_resume(void)
 
 void device_resume(void)
 {
+	might_sleep();
 	down(&dpm_sem);
 	dpm_resume();
 	up(&dpm_sem);
diff --git a/drivers/base/power/suspend.c b/drivers/base/power/suspend.c
index 69509e0..c51531f 100644
--- a/drivers/base/power/suspend.c
+++ b/drivers/base/power/suspend.c
@@ -100,6 +100,7 @@ int device_suspend(pm_message_t state)
 {
 	int error = 0;
 
+	might_sleep();
 	down(&dpm_sem);
 	down(&dpm_list_sem);
 	while (!list_empty(&dpm_active) && error == 0) {

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html
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