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cpuidle: remove state_count field from struct cpuidle_device 

Thomas Schlichter reports the following issue on his Samsung NC20:

"The C-states C1 and C2 to the OS when connected to AC, and additionally
 provides the C3 C-state when disconnected from AC.  However, the number
 of C-states shown in sysfs is fixed to the number of C-states present
 at boot.
   If I boot with AC connected, I always only see the C-states up to C2
   even if I disconnect AC.

   The reason is commit 130a5f6924 (ACPI / cpuidle: remove dev->state_count
   setting).  It removes the update of dev->state_count, but sysfs uses
   exactly this variable to show the C-states.

   The fix is to use drv->state_count in sysfs.  As this is currently the
   last user of dev->state_count, this variable can be completely removed."

Remove dev->state_count as per the above.

Reported-by: Thomas Schlichter <thomas.schlichter@web.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Acked-by: Daniel Lezcano <daniel.lezcano@linaro.org>
Cc: 3.14+ <stable@vger.kernel.org> # 3.14+
[ rjw: Changelog ]
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2015-03-31 20:15:09 +02:00 committed by Rafael J. Wysocki
parent e42391cd04
commit d75e4af14e
3 changed files with 3 additions and 6 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
drivers/cpuidle/cpuidle.c
View File

@ -330,9 +330,6 @@ int cpuidle_enable_device(struct cpuidle_device *dev)
if (!dev->registered)
return -EINVAL;
if (!dev->state_count)
dev->state_count = drv->state_count;
ret = cpuidle_add_device_sysfs(dev);
if (ret)
return ret;

5
drivers/cpuidle/sysfs.c
View File

@ -401,7 +401,7 @@ static int cpuidle_add_state_sysfs(struct cpuidle_device *device)
struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device);
/* state statistics */
for (i = 0; i < device->state_count; i++) {
for (i = 0; i < drv->state_count; i++) {
kobj = kzalloc(sizeof(struct cpuidle_state_kobj), GFP_KERNEL);
if (!kobj)
goto error_state;
@ -433,9 +433,10 @@ error_state:
*/
static void cpuidle_remove_state_sysfs(struct cpuidle_device *device)
{
struct cpuidle_driver *drv = cpuidle_get_cpu_driver(device);
int i;
for (i = 0; i < device->state_count; i++)
for (i = 0; i < drv->state_count; i++)
cpuidle_free_state_kobj(device, i);
}

1
include/linux/cpuidle.h
View File

@ -77,7 +77,6 @@ struct cpuidle_device {
unsigned int cpu;
int last_residency;
int state_count;
struct cpuidle_state_usage states_usage[CPUIDLE_STATE_MAX];
struct cpuidle_state_kobj *kobjs[CPUIDLE_STATE_MAX];
struct cpuidle_driver_kobj *kobj_driver;