linux/drivers/base
Nishanth Menon 0779726cc2 PM / OPP: predictable fail results for opp_find* functions, v2
Currently the opp_find* functions return -ENODEV when:
a) it cant find a device (e.g. request for an OPP search on device
   which was not registered)
b) When it cant find a match for the search strategy used

This makes life a little in-efficient for users such as devfreq
to make reasonable judgement before switching search strategies.

So, standardize the return results as following:
 -EINVAL for bad pointer parameters
 -ENODEV when device cannot be found
 -ERANGE when search fails

This has the following benefit for devfreq implementation:
The search fails when an unregistered device pointer is provided.
This is a trigger to change the search direction and search for
a better fit, however, if we cannot differentiate between a valid
search range failure Vs an unregistered device, second search goes
through the same fail return condition. This can be avoided by
appropriate handling of error return code.

With this change, we also fix devfreq for the improved search
strategy with updated error code.

Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Kevin Hilman <khilman@ti.com>
Acked-by: MyungJoo Ham <myungjoo.ham@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
2012-11-15 00:36:10 +01:00
..
power PM / OPP: predictable fail results for opp_find* functions, v2 2012-11-15 00:36:10 +01:00
regmap regmap: select REGMAP if REGMAP_MMIO and REGMAP_IRQ enabled 2012-10-17 22:09:35 +09:00
attribute_container.c [SCSI] attirbute_container: Initialize sysfs attributes with sysfs_attr_init 2010-03-27 15:15:24 -04:00
base.h driver core: move the deferred probe pointer into the private area 2012-03-08 12:17:22 -08:00
bus.c driver core: move uevent call to driver_register 2012-07-16 18:04:25 -07:00
class.c Revert "driver core: check start node in klist_iter_init_node" 2012-04-19 19:17:30 -07:00
core.c device and dynamic_debug: Use dev_vprintk_emit and dev_printk_emit 2012-09-17 06:10:05 -07:00
cpu.c sched: Remove stale power aware scheduling remnants and dysfunctional knobs 2012-05-17 13:48:56 +02:00
dd.c [SCSI] cleanup usages of scsi_complete_async_scans 2012-07-20 09:25:22 +01:00
devres.c driver core: devres: introduce devres_for_each_res 2012-08-16 13:30:29 -07:00
devtmpfs.c userns: Convert devtmpfs to use GLOBAL_ROOT_UID and GLOBAL_ROOT_GID 2012-09-21 03:13:05 -07:00
dma-buf.c make get_file() return its argument 2012-09-26 21:10:25 -04:00
dma-coherent.c drivers: dma-coherent: Fix typo in dma_mmap_from_coherent documentation 2012-10-23 14:05:32 +02:00
dma-contiguous.c drivers: dma-contiguous: Don't redefine SZ_1M 2012-10-23 14:05:32 +02:00
dma-mapping.c common: dma-mapping: introduce dma_get_sgtable() function 2012-07-30 12:25:46 +02:00
driver.c driver core: don't trigger uevent after failure 2012-07-17 10:40:23 -07:00
firmware_class.c firmware loader: sync firmware cache by async_synchronize_full_domain 2012-10-22 08:37:18 -07:00
firmware.c
hypervisor.c drivers/base: Add export.h for EXPORT_SYMBOL/THIS_MODULE as required. 2011-10-31 19:31:38 -04:00
init.c driver-core: implement 'sysdev' functionality for regular devices and buses 2011-12-14 14:29:38 -08:00
isa.c
Kconfig drivers: cma: Fix wrong CMA selected region size default value 2012-10-23 14:05:33 +02:00
Makefile drivers: add Contiguous Memory Allocator 2012-05-21 15:09:37 +02:00
map.c
memory.c memory-hotplug: update memory block's state and notify userspace 2012-10-09 16:23:02 +09:00
module.c driver core: module.c: Use kasprintf 2010-05-21 09:37:29 -07:00
node.c mm: fix off-by-one bug in print_nodes_state() 2012-05-29 16:22:19 -07:00
platform.c sparc: Add sparc support for platform_get_irq() 2012-11-09 16:30:49 -08:00
soc.c mode_t whack-a-mole: ->is_visible() returns umode_t... 2012-05-29 23:28:42 -04:00
syscore.c PM: Reintroduce dropped call to check_wakeup_irqs 2011-07-11 10:51:49 +02:00
topology.c cpu: convert 'cpu' and 'machinecheck' sysdev_class to a regular subsystem 2011-12-21 14:29:42 -08:00
transport_class.c drivers/base: transport_class explicitly requires EXPORT_SYMBOL 2011-10-31 19:31:15 -04:00