On Wednesday 09 March 2016 02:18 AM, Eduardo Valentin wrote:
On Tue, Feb 16, 2016 at 10:35:45AM +0530, Keerthy wrote:
notify function is used to notify when some temperature thresholds
are crossed. In case we get notified for a critical trip point then
schedule an emergency shutdown function to backup orderly_poweroff
failures.
orderly_poweroff is triggered when a graceful shutdown
of system is desired. This may be used in many critical states of the
kernel such as when subsystems detects conditions such as critical
temperature conditions. However, in certain conditions in system
boot up sequences like those in the middle of driver probes being
initiated, userspace will be unable to power off the system in a clean
manner and leaves the system in a critical state. In cases like these,
the /sbin/poweroff will return success (having forked off to attempt
powering off the system. However, the system overall will fail to
completely poweroff (since other modules will be probed) and the system
is still functional with no userspace (since that would have shut itself
off).
However, there is no clean way of detecting such failure of userspace
powering off the system. In such scenarios, it is necessary for a backup
workqueue to be able to force a shutdown of the system when orderly
shutdown is not successful after a configurable time period.
Signed-off-by: Keerthy <j-keerthy@xxxxxx>
---
The previous discussion:
https://lkml.org/lkml/2016/1/28/989
Making use of the notify ops to schedule a backup thermal shutdown.
Yeah, this was a bit of a stretching. If we cannot fix orderly power
off, I would say, better fixing it for all thermal drivers (previous
version of this). This patch:
1. Abuse a notify function to be used as a power off functions
2. Fix an issue only for a single driver.
I will check your initial version.
Eduardo,
Any updates on this?
Regards,
Keerthy
--
To unsubscribe from this list: send the line "unsubscribe linux-omap" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
