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-rw-r--r--linux-core/drm_irq.c72
1 files changed, 40 insertions, 32 deletions
diff --git a/linux-core/drm_irq.c b/linux-core/drm_irq.c
index 75e53da9..1f887d31 100644
--- a/linux-core/drm_irq.c
+++ b/linux-core/drm_irq.c
@@ -412,7 +412,7 @@ int drm_vblank_get(struct drm_device *dev, int crtc)
unsigned long irqflags;
int ret = 0;
- spin_lock_irqsave(&dev->vbl_lock, irqflags);
+ spin_lock_irqsave(&dev->vbl_lock, irqflags);
/* Going from 0->1 means we have to enable interrupts again */
if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1 &&
!dev->vblank_enabled[crtc]) {
@@ -455,47 +455,49 @@ EXPORT_SYMBOL(drm_vblank_put);
*
* Generally the counter will reset across mode sets. If interrupts are
* enabled around this call, we don't have to do anything since the counter
- * will have already been incremented. If interrupts are off though, we need
- * to make sure we account for the lost events at %_DRM_POST_MODESET time.
+ * will have already been incremented.
*/
int drm_modeset_ctl(struct drm_device *dev, void *data,
struct drm_file *file_priv)
{
struct drm_modeset_ctl *modeset = data;
unsigned long irqflags;
- u32 new, diff;
int crtc, ret = 0;
+ /* If drm_vblank_init() hasn't been called yet, just no-op */
+ if (!dev->num_crtcs)
+ goto out;
+
crtc = modeset->crtc;
if (crtc >= dev->num_crtcs) {
ret = -EINVAL;
goto out;
}
+ /*
+ * To avoid all the problems that might happen if interrupts
+ * were enabled/disabled around or between these calls, we just
+ * have the kernel take a reference on the CRTC (just once though
+ * to avoid corrupting the count if multiple, mismatch calls occur),
+ * so that interrupts remain enabled in the interim.
+ */
switch (modeset->cmd) {
case _DRM_PRE_MODESET:
- spin_lock_irqsave(&dev->vbl_lock, irqflags);
- dev->vblank_disable_allowed = 1;
- if (!dev->vblank_enabled[crtc]) {
- dev->vblank_premodeset[crtc] =
- dev->driver->get_vblank_counter(dev, crtc);
+ if (!dev->vblank_suspend[crtc]) {
+ spin_lock_irqsave(&dev->vbl_lock, irqflags);
dev->vblank_suspend[crtc] = 1;
+ spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
+ drm_vblank_get(dev, crtc);
}
- spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
break;
case _DRM_POST_MODESET:
- spin_lock_irqsave(&dev->vbl_lock, irqflags);
- dev->vblank_disable_allowed = 1;
- new = dev->driver->get_vblank_counter(dev, crtc);
- if (dev->vblank_suspend[crtc] && !dev->vblank_enabled[crtc]) {
- if (new > dev->vblank_premodeset[crtc])
- diff = dev->vblank_premodeset[crtc] - new;
- else
- diff = new;
- atomic_add(diff, &dev->_vblank_count[crtc]);
+ if (dev->vblank_suspend[crtc]) {
+ spin_lock_irqsave(&dev->vbl_lock, irqflags);
+ dev->vblank_disable_allowed = 1;
+ dev->vblank_suspend[crtc] = 0;
+ spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
+ drm_vblank_put(dev, crtc);
}
- dev->vblank_suspend[crtc] = 0;
- spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
break;
default:
ret = -EINVAL;
@@ -549,6 +551,9 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
if (crtc >= dev->num_crtcs)
return -EINVAL;
+ ret = drm_vblank_get(dev, crtc);
+ if (ret)
+ return ret;
seq = drm_vblank_count(dev, crtc);
switch (vblwait->request.type & _DRM_VBLANK_TYPES_MASK) {
@@ -558,7 +563,8 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
case _DRM_VBLANK_ABSOLUTE:
break;
default:
- return -EINVAL;
+ ret = -EINVAL;
+ goto done;
}
if ((flags & _DRM_VBLANK_NEXTONMISS) &&
@@ -571,8 +577,10 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
struct list_head *vbl_sigs = &dev->vbl_sigs[crtc];
struct drm_vbl_sig *vbl_sig;
- if (dev->vblank_suspend[crtc])
- return -EBUSY;
+ if (dev->vblank_suspend[crtc]) {
+ ret = -EBUSY;
+ goto done;
+ }
spin_lock_irqsave(&dev->vbl_lock, irqflags);
@@ -594,15 +602,18 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
if (atomic_read(&dev->vbl_signal_pending) >= 100) {
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
- return -EBUSY;
+ ret = -EBUSY;
+ goto done;
}
spin_unlock_irqrestore(&dev->vbl_lock, irqflags);
vbl_sig = drm_calloc(1, sizeof(struct drm_vbl_sig),
DRM_MEM_DRIVER);
- if (!vbl_sig)
- return -ENOMEM;
+ if (!vbl_sig) {
+ ret = -ENOMEM;
+ goto done;
+ }
ret = drm_vblank_get(dev, crtc);
if (ret) {
@@ -626,13 +637,9 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
vblwait->reply.sequence = seq;
} else {
if (!dev->vblank_suspend[crtc]) {
- ret = drm_vblank_get(dev, crtc);
- if (ret)
- return ret;
DRM_WAIT_ON(ret, dev->vbl_queue[crtc], 3 * DRM_HZ,
((drm_vblank_count(dev, crtc)
- vblwait->request.sequence) <= (1 << 23)));
- drm_vblank_put(dev, crtc);
}
if (ret != -EINTR) {
@@ -646,7 +653,8 @@ int drm_wait_vblank(struct drm_device *dev, void *data,
}
}
- done:
+done:
+ drm_vblank_put(dev, crtc);
return ret;
}