Re: [PATCH] drm: Do not use BUG_ON(!spin_is_locked())

[sanjeev sharma <sanjeevsharmaengg@xxxxxxxxx>]

Hello Roeck,

This should be replaced everywhere in driver.what do you say ?

Regards
Sanjeev Sharma

On Mon, Aug 11, 2014 at 10:01 AM, Guenter Roeck <linux@xxxxxxxxxxxx> wrote:

spin_is_locked() always returns false in uniprocessor configurations
and can therefore not be used with BUG_ON. Replace it with
assert_spin_locked(), which exists for that very purpose.

Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx>
---
 drivers/gpu/drm/msm/mdp/mdp_kms.c          | 2 +-
 drivers/gpu/drm/nouveau/core/core/event.c  | 4 ++--
 drivers/gpu/drm/nouveau/core/core/notify.c | 2 +-
 drivers/gpu/drm/omapdrm/omap_irq.c         | 2 +-
 4 files changed, 5 insertions(+), 5 deletions(-)

diff --git a/drivers/gpu/drm/msm/mdp/mdp_kms.c b/drivers/gpu/drm/msm/mdp/mdp_kms.c
index 03455b6..92a1531 100644
--- a/drivers/gpu/drm/msm/mdp/mdp_kms.c
+++ b/drivers/gpu/drm/msm/mdp/mdp_kms.c
@@ -34,7 +34,7 @@ static void update_irq(struct mdp_kms *mdp_kms)
        struct mdp_irq *irq;
        uint32_t irqmask = mdp_kms->vblank_mask;

-       BUG_ON(!spin_is_locked(&list_lock));
+       assert_spin_locked(&list_lock);

        list_for_each_entry(irq, &mdp_kms->irq_list, node)
                irqmask |= irq->irqmask;
diff --git a/drivers/gpu/drm/nouveau/core/core/event.c b/drivers/gpu/drm/nouveau/core/core/event.c
index 0540a48..9327117 100644
--- 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, u32 types, int index)
 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) {
diff --git a/drivers/gpu/drm/nouveau/core/core/notify.c b/drivers/gpu/drm/nouveau/core/core/notify.c
index 76adb81..f70dbc4 100644
--- 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 *notify, void *data, u32 size)
        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);
diff --git a/drivers/gpu/drm/omapdrm/omap_irq.c b/drivers/gpu/drm/omapdrm/omap_irq.c
index f035d2b..3eb097e 100644
--- a/drivers/gpu/drm/omapdrm/omap_irq.c
+++ b/drivers/gpu/drm/omapdrm/omap_irq.c
@@ -34,7 +34,7 @@ static void omap_irq_update(struct drm_device *dev)
        struct omap_drm_irq *irq;
        uint32_t irqmask = priv->vblank_mask;

-       BUG_ON(!spin_is_locked(&list_lock));
+       assert_spin_locked(&list_lock);

        list_for_each_entry(irq, &priv->irq_list, node)
                irqmask |= irq->irqmask;
--
1.9.1

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