Patch "drm/nouveau/therm: remove ineffective workarounds for alarm bugs" has been added to the 4.9-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

    drm/nouveau/therm: remove ineffective workarounds for alarm bugs

to the 4.9-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-nouveau-therm-remove-ineffective-workarounds-for-alarm-bugs.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From e4311ee51d1e2676001b2d8fcefd92bdd79aad85 Mon Sep 17 00:00:00 2001
From: Ben Skeggs <bskeggs@redhat.com>
Date: Thu, 11 May 2017 17:33:39 +1000
Subject: drm/nouveau/therm: remove ineffective workarounds for alarm bugs

From: Ben Skeggs <bskeggs@redhat.com>

commit e4311ee51d1e2676001b2d8fcefd92bdd79aad85 upstream.

These were ineffective due to touching the list without the alarm lock,
but should no longer be required.

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c   |    2 +-
 drivers/gpu/drm/nouveau/nvkm/subdev/therm/fan.c    |    2 +-
 drivers/gpu/drm/nouveau/nvkm/subdev/therm/fantog.c |    2 +-
 drivers/gpu/drm/nouveau/nvkm/subdev/therm/temp.c   |    2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

--- a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/base.c
@@ -130,7 +130,7 @@ nvkm_therm_update(struct nvkm_therm *the
 		poll = false;
 	}
 
-	if (list_empty(&therm->alarm.head) && poll)
+	if (poll)
 		nvkm_timer_alarm(tmr, 1000000000ULL, &therm->alarm);
 	spin_unlock_irqrestore(&therm->lock, flags);
 
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fan.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fan.c
@@ -83,7 +83,7 @@ nvkm_fan_update(struct nvkm_fan *fan, bo
 	spin_unlock_irqrestore(&fan->lock, flags);
 
 	/* schedule next fan update, if not at target speed already */
-	if (list_empty(&fan->alarm.head) && target != duty) {
+	if (target != duty) {
 		u16 bump_period = fan->bios.bump_period;
 		u16 slow_down_period = fan->bios.slow_down_period;
 		u64 delay;
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fantog.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/fantog.c
@@ -53,7 +53,7 @@ nvkm_fantog_update(struct nvkm_fantog *f
 	duty = !nvkm_gpio_get(gpio, 0, DCB_GPIO_FAN, 0xff);
 	nvkm_gpio_set(gpio, 0, DCB_GPIO_FAN, 0xff, duty);
 
-	if (list_empty(&fan->alarm.head) && percent != (duty * 100)) {
+	if (percent != (duty * 100)) {
 		u64 next_change = (percent * fan->period_us) / 100;
 		if (!duty)
 			next_change = fan->period_us - next_change;
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/therm/temp.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/therm/temp.c
@@ -185,7 +185,7 @@ alarm_timer_callback(struct nvkm_alarm *
 	spin_unlock_irqrestore(&therm->sensor.alarm_program_lock, flags);
 
 	/* schedule the next poll in one second */
-	if (therm->func->temp_get(therm) >= 0 && list_empty(&alarm->head))
+	if (therm->func->temp_get(therm) >= 0)
 		nvkm_timer_alarm(tmr, 1000000000ULL, alarm);
 }
 


Patches currently in stable-queue which might be from bskeggs@redhat.com are

queue-4.9/drm-nouveau-tmr-ack-interrupt-before-processing-alarms.patch
queue-4.9/drm-nouveau-tmr-fix-corruption-of-the-pending-list-when-rescheduling-an-alarm.patch
queue-4.9/drm-nouveau-tmr-avoid-processing-completed-alarms-when-adding-a-new-one.patch
queue-4.9/drm-nouveau-mmu-nv4a-use-nv04-mmu-rather-than-the-nv44-one.patch
queue-4.9/drm-nouveau-therm-remove-ineffective-workarounds-for-alarm-bugs.patch
queue-4.9/drm-nouveau-tmr-handle-races-with-hw-when-updating-the-next-alarm-time.patch