[PATCH 4.14 025/106] PM: hibernate: use correct mode for swsusp_close()

Greg Kroah-Hartman
2021-12-06T15:15:44Z

From: Thomas Zeitlhofer <thomas.zeitlhofer+lkml@ze-it.at>

[ Upstream commit cefcf24b4d351daf70ecd945324e200d3736821e ]

Commit 39fbef4b0f77 ("PM: hibernate: Get block device exclusively in
swsusp_check()") changed the opening mode of the block device to
(FMODE_READ | FMODE_EXCL).

In the corresponding calls to swsusp_close(), the mode is still just
FMODE_READ which triggers the warning in blkdev_flush_mapping() on
resume from hibernate.

So, use the mode (FMODE_READ | FMODE_EXCL) also when closing the
device.

Fixes: 39fbef4b0f77 ("PM: hibernate: Get block device exclusively in swsusp_check()")
Signed-off-by: Thomas Zeitlhofer <thomas.zeitlhofer+lkml@ze-it.at>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
kernel/power/hibernate.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/kernel/power/hibernate.c b/kernel/power/hibernate.c
index 02df69a8ee3c0..e68b1c20ad3d2 100644
--- a/kernel/power/hibernate.c
+++ b/kernel/power/hibernate.c
@@ -668,7 +668,7 @@ static int load_image_and_restore(void)
goto Unlock;

error = swsusp_read(&flags);
- swsusp_close(FMODE_READ);
+ swsusp_close(FMODE_READ | FMODE_EXCL);
if (!error)
hibernation_restore(flags & SF_PLATFORM_MODE);

@@ -865,7 +865,7 @@ static int software_resume(void)
/* The snapshot device should not be opened while we're running */
if (!atomic_add_unless(&snapshot_device_available, -1, 0)) {
error = -EBUSY;
- swsusp_close(FMODE_READ);
+ swsusp_close(FMODE_READ | FMODE_EXCL);
goto Unlock;
}

@@ -901,7 +901,7 @@ static int software_resume(void)
pm_pr_dbg("Hibernation image not present or could not be loaded.\n");
return error;
Close_Finish:
- swsusp_close(FMODE_READ);
+ swsusp_close(FMODE_READ | FMODE_EXCL);
goto Finish;
}

--
2.33.0