This is a note to let you know that I've just added the patch titled
mei: don't schedule suspend in pm idle
to the 3.16-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mei-don-t-schedule-suspend-in-pm-idle.patch
and it can be found in the queue-3.16 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From d5d83f8abea13d0b50ee762276c6c900d1946264 Mon Sep 17 00:00:00 2001
From: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>
Date: Thu, 17 Jul 2014 10:53:36 +0300
Subject: mei: don't schedule suspend in pm idle
From: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>
commit d5d83f8abea13d0b50ee762276c6c900d1946264 upstream.
Calling pm_schedule_suspend from the runtime pm idle callback
may reschedule existing timer, thus in case of frequent runtime
rpm idle call the suspend maybe starved.
Instead we call pm_runtime_autosuspend which is checking if the
timer is already charged.
An example is monitoring device pci config space.
Pci config sysfs handlers calls pci_config_pm_runtime_put/get
helpers which in turns calls to device idle callback
Signed-off-by: Alexander Usyskin <alexander.usyskin@xxxxxxxxx>
Signed-off-by: Tomas Winkler <tomas.winkler@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/misc/mei/pci-me.c | 2 +-
drivers/misc/mei/pci-txe.c | 2 +-
2 files changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/misc/mei/pci-me.c
+++ b/drivers/misc/mei/pci-me.c
@@ -369,7 +369,7 @@ static int mei_me_pm_runtime_idle(struct
if (!dev)
return -ENODEV;
if (mei_write_is_idle(dev))
- pm_schedule_suspend(device, MEI_ME_RPM_TIMEOUT * 2);
+ pm_runtime_autosuspend(device);
return -EBUSY;
}
--- a/drivers/misc/mei/pci-txe.c
+++ b/drivers/misc/mei/pci-txe.c
@@ -306,7 +306,7 @@ static int mei_txe_pm_runtime_idle(struc
if (!dev)
return -ENODEV;
if (mei_write_is_idle(dev))
- pm_schedule_suspend(device, MEI_TXI_RPM_TIMEOUT * 2);
+ pm_runtime_autosuspend(device);
return -EBUSY;
}
Patches currently in stable-queue which might be from alexander.usyskin@xxxxxxxxx are
queue-3.16/mei-fix-return-value-on-disconnect-timeout.patch
queue-3.16/mei-start-disconnect-request-timer-consistently.patch
queue-3.16/mei-don-t-schedule-suspend-in-pm-idle.patch
queue-3.16/mei-reset-client-connection-state-on-timeout.patch
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