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| author |   Sebastian Capella <sebastian.capella@linaro.org> | 2014-02-18 17:52:08 -0800 |
|---|---|---|
| committer |   Rafael J. Wysocki <rafael.j.wysocki@intel.com> | 2014-02-26 01:13:15 +0100 |
| commit | f8d5b9e9e5372f0deb7bc1ab1088a9b60b0a793d (patch) | |
| tree | 7ad881c6ca24b6cac29cb2321ecea6b3edba21f2 /drivers/base/firmware_class.c | |
| parent | Linux 3.14-rc4 (diff) | |
| download | linux-dev-f8d5b9e9e5372f0deb7bc1ab1088a9b60b0a793d.tar.xz linux-dev-f8d5b9e9e5372f0deb7bc1ab1088a9b60b0a793d.zip | |
PM / hibernate: Fix restore hang in freeze_processes()
During restore, pm_notifier chain are called with
PM_RESTORE_PREPARE. The firmware_class driver handler
fw_pm_notify does not have a handler for this. As a result,
it keeps a reader on the kmod.c umhelper_sem. During
freeze_processes, the call to __usermodehelper_disable tries to
take a write lock on this semaphore and hangs waiting.
Signed-off-by: Sebastian Capella <sebastian.capella@linaro.org>
Acked-by: Ming Lei <ming.lei@canonical.com>
Cc: All applicable <stable@vger.kernel.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/base/firmware_class.c')
| -rw-r--r-- | drivers/base/firmware_class.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/base/firmware_class.c b/drivers/base/firmware_class.c index 8a97ddfa6122..c30df50e4440 100644 --- a/drivers/base/firmware_class.c +++ b/drivers/base/firmware_class.c @@ -1580,6 +1580,7 @@ static int fw_pm_notify(struct notifier_block *notify_block, switch (mode) { case PM_HIBERNATION_PREPARE: case PM_SUSPEND_PREPARE: + case PM_RESTORE_PREPARE: kill_requests_without_uevent(); device_cache_fw_images(); break; |