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authorBartlomiej Zolnierkiewicz <b.zolnierkie@samsung.com>2015-03-31 20:15:09 +0200
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2015-04-03 13:15:50 +0200
commitd75e4af14e228bbe3f86e29bcecb8e6be98d4e04 (patch)
tree6a7c821d8dd08581e092a7b08ce8009001636b2b /drivers/cpuidle
parente42391cd048809d903291d07f86ed3934ce138e9 (diff)
downloadlinux-d75e4af14e228bbe3f86e29bcecb8e6be98d4e04.tar.bz2
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 130a5f692425 (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>
Diffstat (limited to 'drivers/cpuidle')
-rw-r--r--drivers/cpuidle/cpuidle.c3
-rw-r--r--drivers/cpuidle/sysfs.c5
2 files changed, 3 insertions, 5 deletions
diff --git a/drivers/cpuidle/cpuidle.c b/drivers/cpuidle/cpuidle.c
index 080bd2dbde4b..7a73a279e179 100644
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -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;
diff --git a/drivers/cpuidle/sysfs.c b/drivers/cpuidle/sysfs.c
index 97c5903b4606..832a2c3f01ff 100644
--- a/drivers/cpuidle/sysfs.c
+++ b/drivers/cpuidle/sysfs.c
@@ -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);
}