[001/102] clockevents: Don't allow dummy broadcast timers

Message ID 1365414657-29191-2-git-send-email-luis.henriques@canonical.com
State New
Headers show

Commit Message

Luis Henriques April 8, 2013, 9:49 a.m. -stable review patch.  If anyone has any objections, please let me know.


From: Mark Rutland <mark.rutland@arm.com>

commit a7dc19b8652c862d5b7c4d2339bd3c428bd29c4a upstream.

Currently tick_check_broadcast_device doesn't reject clock_event_devices
with CLOCK_EVT_FEAT_DUMMY, and may select them in preference to real
hardware if they have a higher rating value. In this situation, the
dummy timer is responsible for broadcasting to itself, and the core
clockevents code may attempt to call non-existent callbacks for
programming the dummy, eventually leading to a panic.

This patch makes tick_check_broadcast_device always reject dummy timers,
preventing this problem.

Signed-off-by: Mark Rutland <mark.rutland@arm.com>
Cc: linux-arm-kernel@lists.infradead.org
Cc: Jon Medhurst (Tixy) <tixy@linaro.org>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Luis Henriques <luis.henriques@canonical.com>
 kernel/time/tick-broadcast.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)


diff --git a/kernel/time/tick-broadcast.c b/kernel/time/tick-broadcast.c
index f113755..a13987a 100644
--- a/kernel/time/tick-broadcast.c
+++ b/kernel/time/tick-broadcast.c
@@ -66,7 +66,8 @@  static void tick_broadcast_start_periodic(struct clock_event_device *bc)
 int tick_check_broadcast_device(struct clock_event_device *dev)
-	if ((tick_broadcast_device.evtdev &&
+	if ((dev->features & CLOCK_EVT_FEAT_DUMMY) ||
+	    (tick_broadcast_device.evtdev &&
 	     tick_broadcast_device.evtdev->rating >= dev->rating) ||
 	     (dev->features & CLOCK_EVT_FEAT_C3STOP))
 		return 0;