linux-kernel - [ 031/109] PM / Sleep: call early resume handlers when suspend

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Message-Id: <20120807222045.835898036@linuxfoundation.org>
Date:	Tue,  7 Aug 2012 15:34:50 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:	Greg KH <gregkh@...uxfoundation.org>,
	torvalds@...ux-foundation.org, akpm@...ux-foundation.org,
	alan@...rguk.ukuu.org.uk, Colin Cross <ccross@...roid.com>,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: [ 031/109] PM / Sleep: call early resume handlers when suspend_noirq fails

From: Greg KH <gregkh@...uxfoundation.org>

3.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Colin Cross <ccross@...roid.com>

commit 064b021fbe470ecc9ca10f9f87af48c0fc0865fb upstream.

Commit cf579dfb82550e34de7ccf3ef090d8b834ccd3a9 (PM / Sleep: Introduce
"late suspend" and "early resume" of devices) introduced a bug where
suspend_late handlers would be called, but if dpm_suspend_noirq returned
an error the early_resume handlers would never be called.  All devices
would end up on the dpm_late_early_list, and would never be resumed
again.

Fix it by calling dpm_resume_early when dpm_suspend_noirq returns
an error.

Signed-off-by: Colin Cross <ccross@...roid.com>
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/base/power/main.c |   10 +++++++++-
 1 file changed, 9 insertions(+), 1 deletion(-)

--- a/drivers/base/power/main.c
+++ b/drivers/base/power/main.c
@@ -979,8 +979,16 @@ static int dpm_suspend_late(pm_message_t
 int dpm_suspend_end(pm_message_t state)
 {
 	int error = dpm_suspend_late(state);
+	if (error)
+		return error;

-	return error ? : dpm_suspend_noirq(state);
+	error = dpm_suspend_noirq(state);
+	if (error) {
+		dpm_resume_early(state);
+		return error;
+	}
+
+	return 0;
 }
 EXPORT_SYMBOL_GPL(dpm_suspend_end);

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