From: Thomas Gleixner <tglx@linutronix.de>
Date: Tue, 7 Jul 2015 15:45:22 +0000 (+0200)
Subject: tick/broadcast: Return busy if periodic mode and hrtimer broadcast
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=d33257264b0267a8fd20f6717abbb484c9e21130;p=GitHub%2Fexynos8895%2Fandroid_kernel_samsung_universal8895.git

tick/broadcast: Return busy if periodic mode and hrtimer broadcast

If the system is in periodic mode and the broadcast device is hrtimer
based, return busy as we have no proper handling for this.

[ Split out from a larger combo patch ]

Tested-by: Sudeep Holla <sudeep.holla@arm.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: Suzuki Poulose <Suzuki.Poulose@arm.com>
Cc: Lorenzo Pieralisi <Lorenzo.Pieralisi@arm.com>
Cc: Catalin Marinas <Catalin.Marinas@arm.com>
Cc: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Preeti U Murthy <preeti@linux.vnet.ibm.com>
Cc: Ingo Molnar <mingo@kernel.org>
Link: http://lkml.kernel.org/r/alpine.DEB.2.11.1507070929360.3916@nanos
---

diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index 83aa92e87a85..da7b40fdf6d0 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -709,8 +709,12 @@ int __tick_broadcast_oneshot_control(enum tick_broadcast_state state)
 		 * If the broadcast device is in periodic mode, we
 		 * return.
 		 */
-		if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC)
+		if (tick_broadcast_device.mode == TICKDEV_MODE_PERIODIC) {
+			/* If it is a hrtimer based broadcast, return busy */
+			if (bc->features & CLOCK_EVT_FEAT_HRTIMER)
+				ret = -EBUSY;
 			goto out;
+		}
 
 		if (!cpumask_test_and_set_cpu(cpu, tick_broadcast_oneshot_mask)) {
 			WARN_ON_ONCE(cpumask_test_cpu(cpu, tick_broadcast_pending_mask));