3.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: "Rafael J. Wysocki" <rafael.j.wyso...@intel.com>
commit 3836785a1bdcd6706c68ad46bf53adc0b057b310 upstream.
If there is a PM QoS latency limit and all of the sufficiently shallow
C-states are disabled, the cpuidle menu governor returns 0 which on
some systems is CPUIDLE_DRIVER_STATE_START and shouldn't be returned
if that C-state has been disabled.
Fix the issue by modifying the menu governor to return (-1) in such
situations.
Signed-off-by: Rafael J. Wysocki <rafael.j.wyso...@intel.com>
[shilpab: Backport to 3.10.y
- adjust context
- add a check if 'next_state' is less than 0 in 'cpuidle_idle_call()',
this ensures that we exit 'cpuidle_idle_call()' if governor->select()
returns negative value]
Signed-off-by: Shilpasri G Bhat <shilpa.b...@linux.vnet.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
drivers/cpuidle/cpuidle.c | 3 +++
drivers/cpuidle/governors/menu.c | 2 +-
2 files changed, 4 insertions(+), 1 deletion(-)
--- a/drivers/cpuidle/cpuidle.c
+++ b/drivers/cpuidle/cpuidle.c
@@ -135,6 +135,9 @@ int cpuidle_idle_call(void)
/* ask the governor for the next state */
next_state = cpuidle_curr_governor->select(drv, dev);
+ if (next_state < 0)
+ return -EBUSY;
+
if (need_resched()) {
dev->last_residency = 0;
/* give the governor an opportunity to reflect on the outcome */
--- a/drivers/cpuidle/governors/menu.c
+++ b/drivers/cpuidle/governors/menu.c
@@ -269,7 +269,7 @@ static int menu_select(struct cpuidle_dr
data->needs_update = 0;
}
- data->last_state_idx = 0;
+ data->last_state_idx = CPUIDLE_DRIVER_STATE_START - 1;
data->exit_us = 0;
/* Special case when user has set very strict latency requirement */
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
