Srinivas Pandruvada ad7532cefd iio: hid-sensor-trigger: Don't touch sensors unless user space requests ... One of the user complained that on his system Thinkpad Yoga S1, with commit f1664eaace ("iio: hid-sensor-trigger: Fix the race with user space powering up sensors") causes the system to resume immediately on suspend (S3 operation). On this system the sensor hub is on USB and is a wake up device from S3. So if any sensor sends data on motion, the system will wake up. This can be a legitimate use case to wake up device motion, but that needs proper user space support to set right thresholds. In fact the above commit didn't cause this regression, but any operation which cause sensors to wake up would have caused the same issue. So if user reads the raw sensor data, same issue occurs, with or without this commit. Only difference is that the above commit by default will trigger a power up and power down of sensors as part of runtime pm enable (runtime enable will cause a runtime resume callback followed by runtime_suspend callback). Previously user has to do some action on sensors. On investigation it was observed that the current driver correctly changing the state of all sensors to power off but then also some sensor will still send some data. Only option is to never power up any sensor. Only good option is to: - Using sysfs interface disable USB as a wakeup device (This will not need any driver change) Since some user don't care about sensors. So for those users this change brings back old functionality. As long as they don't cause any operation to power up sensors (like raw read or start iio-sensor-proxy service), the sensors will not be to touched. This is done by delaying run time enable till user space does some operation with sensors. Link: https://bugzilla.kernel.org/show_bug.cgi?id=196853 Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>		2017-10-14 19:29:50 +01:00
..
acpi	ACPI / bus: Make ACPI_HANDLE() work for non-GPL code again	2017-09-19 22:42:31 +02:00
asm-generic	percpu: make this_cpu_generic_read() atomic w.r.t. interrupts	2017-09-26 07:37:33 -07:00
clocksource
crypto	crypto: hash - add crypto_(un)register_ahashes()	2017-08-22 14:54:52 +08:00
drm	lib/interval_tree: fast overlap detection	2017-09-08 18:26:49 -07:00
dt-bindings	ARC: reset: remove the misleading v1 suffix all over	2017-09-18 13:02:03 +02:00
keys	net: rxrpc: Replace time_t type with time64_t type	2017-08-29 10:16:00 +01:00
kvm
linux	iio: hid-sensor-trigger: Don't touch sensors unless user space requests	2017-10-14 19:29:50 +01:00
math-emu
media	media updates for v4.14-rc1	2017-09-07 12:53:14 -07:00
memory
misc
net	udp: perform source validation for mcast early demux	2017-10-01 03:55:47 +01:00
pcmcia
ras
rdma	IB: Correct MR length field to be 64-bit	2017-09-25 11:47:23 -04:00
scsi	scsi: libiscsi: Remove iscsi_destroy_session	2017-10-02 22:23:21 -04:00
soc	ARM: SoC driver updates for v4.14	2017-09-10 20:40:00 -07:00
sound	sound fixes for 4.14-rc4	2017-10-05 10:39:29 -07:00
target
trace	sched/debug: Add explicit TASK_PARKED printing	2017-09-29 11:02:57 +02:00
uapi	- A stable fix for the alignment of the event number reported at the	2017-10-05 15:17:40 -07:00
video
xen	xen, arm64: drop dummy lookup_address()	2017-09-19 09:25:05 -04:00