This is a note to let you know that I've just added the patch titled
drm/nouveau/nouveau: Do not BUG_ON(!spin_is_locked()) on UP
to the 3.18-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-nouveau-do-not-bug_on-spin_is_locked-on-up.patch
and it can be found in the queue-3.18 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <[email protected]> know about it.
>From ff4c0d5213b015e60aa87c1352604f10ba9c3e12 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Bruno=20Pr=C3=A9mont?= <[email protected]>
Date: Sun, 21 Dec 2014 17:43:31 +0100
Subject: drm/nouveau/nouveau: Do not BUG_ON(!spin_is_locked()) on UP
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From: =?UTF-8?q?Bruno=20Pr=C3=A9mont?= <[email protected]>
commit ff4c0d5213b015e60aa87c1352604f10ba9c3e12 upstream.
On !SMP systems spinlocks do not exist. Thus checking of they
are active will always fail.
Use
assert_spin_locked(lock);
instead of
BUG_ON(!spin_is_locked(lock));
to not BUG() on all UP systems.
Signed-off-by: Bruno Prémont <[email protected]>
Signed-off-by: Ben Skeggs <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
---
drivers/gpu/drm/nouveau/core/core/event.c | 4 ++--
drivers/gpu/drm/nouveau/core/core/notify.c | 2 +-
2 files changed, 3 insertions(+), 3 deletions(-)
--- a/drivers/gpu/drm/nouveau/core/core/event.c
+++ b/drivers/gpu/drm/nouveau/core/core/event.c
@@ -26,7 +26,7 @@
void
nvkm_event_put(struct nvkm_event *event, u32 types, int index)
{
- BUG_ON(!spin_is_locked(&event->refs_lock));
+ assert_spin_locked(&event->refs_lock);
while (types) {
int type = __ffs(types); types &= ~(1 << type);
if (--event->refs[index * event->types_nr + type] == 0) {
@@ -39,7 +39,7 @@ nvkm_event_put(struct nvkm_event *event,
void
nvkm_event_get(struct nvkm_event *event, u32 types, int index)
{
- BUG_ON(!spin_is_locked(&event->refs_lock));
+ assert_spin_locked(&event->refs_lock);
while (types) {
int type = __ffs(types); types &= ~(1 << type);
if (++event->refs[index * event->types_nr + type] == 1) {
--- a/drivers/gpu/drm/nouveau/core/core/notify.c
+++ b/drivers/gpu/drm/nouveau/core/core/notify.c
@@ -98,7 +98,7 @@ nvkm_notify_send(struct nvkm_notify *not
struct nvkm_event *event = notify->event;
unsigned long flags;
- BUG_ON(!spin_is_locked(&event->list_lock));
+ assert_spin_locked(&event->list_lock);
BUG_ON(size != notify->size);
spin_lock_irqsave(&event->refs_lock, flags);
Patches currently in stable-queue which might be from [email protected]
are
queue-3.18/drm-nouveau-nouveau-do-not-bug_on-spin_is_locked-on-up.patch
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