linux-kernel - [25/71] PM: Fix warning in pm_restrict_gfp_mask() during SNAPSHOT

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Date:	Thu, 19 May 2011 11:04:53 -0700
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	"Rafael J. Wysocki" <rjw@...k.pl>
Subject: [25/71] PM: Fix warning in pm_restrict_gfp_mask() during SNAPSHOT_S2RAM ioctl

2.6.38-stable review patch.  If anyone has any objections, please let us know.

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

From: Rafael J. Wysocki <rjw@...k.pl>

commit 87186475a402391a1ca7d42a675c9b35a18dc348 upstream.

A warning is printed by pm_restrict_gfp_mask() while the
SNAPSHOT_S2RAM ioctl is being executed after creating a hibernation
image, because pm_restrict_gfp_mask() has been called once already
before the image creation and suspend_devices_and_enter() calls it
once again.  This happens after commit 452aa6999e6703ffbddd7f6ea124d3
(mm/pm: force GFP_NOIO during suspend/hibernation and resume).

To avoid this issue, move pm_restrict_gfp_mask() and
pm_restore_gfp_mask() from suspend_devices_and_enter() to its caller
in kernel/power/suspend.c.

Reported-by: Alexandre Felipe Muller de Souza <alexandrefm@...driva.com.br>
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 kernel/power/suspend.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/kernel/power/suspend.c
+++ b/kernel/power/suspend.c
@@ -209,7 +209,6 @@ int suspend_devices_and_enter(suspend_st
 			goto Close;
 	}
 	suspend_console();
-	pm_restrict_gfp_mask();
 	suspend_test_start();
 	error = dpm_suspend_start(PMSG_SUSPEND);
 	if (error) {
@@ -226,7 +225,6 @@ int suspend_devices_and_enter(suspend_st
 	suspend_test_start();
 	dpm_resume_end(PMSG_RESUME);
 	suspend_test_finish("resume devices");
-	pm_restore_gfp_mask();
 	resume_console();
  Close:
 	if (suspend_ops->end)
@@ -287,7 +285,9 @@ int enter_state(suspend_state_t state)
 		goto Finish;

 	pr_debug("PM: Entering %s sleep\n", pm_states[state]);
+	pm_restrict_gfp_mask();
 	error = suspend_devices_and_enter(state);
+	pm_restore_gfp_mask();

  Finish:
 	pr_debug("PM: Finishing wakeup.\n");

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