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path: root/drivers/gpu/drm/drm_irq.c
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Diffstat (limited to 'drivers/gpu/drm/drm_irq.c')
-rw-r--r--drivers/gpu/drm/drm_irq.c9
1 files changed, 0 insertions, 9 deletions
diff --git a/drivers/gpu/drm/drm_irq.c b/drivers/gpu/drm/drm_irq.c
index 68b756253f9f..44a5d0ad8b7c 100644
--- a/drivers/gpu/drm/drm_irq.c
+++ b/drivers/gpu/drm/drm_irq.c
@@ -110,10 +110,7 @@ static void vblank_disable_and_save(struct drm_device *dev, int crtc)
110 /* Prevent vblank irq processing while disabling vblank irqs, 110 /* Prevent vblank irq processing while disabling vblank irqs,
111 * so no updates of timestamps or count can happen after we've 111 * so no updates of timestamps or count can happen after we've
112 * disabled. Needed to prevent races in case of delayed irq's. 112 * disabled. Needed to prevent races in case of delayed irq's.
113 * Disable preemption, so vblank_time_lock is held as short as
114 * possible, even under a kernel with PREEMPT_RT patches.
115 */ 113 */
116 preempt_disable();
117 spin_lock_irqsave(&dev->vblank_time_lock, irqflags); 114 spin_lock_irqsave(&dev->vblank_time_lock, irqflags);
118 115
119 dev->driver->disable_vblank(dev, crtc); 116 dev->driver->disable_vblank(dev, crtc);
@@ -164,7 +161,6 @@ static void vblank_disable_and_save(struct drm_device *dev, int crtc)
164 clear_vblank_timestamps(dev, crtc); 161 clear_vblank_timestamps(dev, crtc);
165 162
166 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags); 163 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags);
167 preempt_enable();
168} 164}
169 165
170static void vblank_disable_fn(unsigned long arg) 166static void vblank_disable_fn(unsigned long arg)
@@ -889,10 +885,6 @@ int drm_vblank_get(struct drm_device *dev, int crtc)
889 spin_lock_irqsave(&dev->vbl_lock, irqflags); 885 spin_lock_irqsave(&dev->vbl_lock, irqflags);
890 /* Going from 0->1 means we have to enable interrupts again */ 886 /* Going from 0->1 means we have to enable interrupts again */
891 if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1) { 887 if (atomic_add_return(1, &dev->vblank_refcount[crtc]) == 1) {
892 /* Disable preemption while holding vblank_time_lock. Do
893 * it explicitely to guard against PREEMPT_RT kernel.
894 */
895 preempt_disable();
896 spin_lock_irqsave(&dev->vblank_time_lock, irqflags2); 888 spin_lock_irqsave(&dev->vblank_time_lock, irqflags2);
897 if (!dev->vblank_enabled[crtc]) { 889 if (!dev->vblank_enabled[crtc]) {
898 /* Enable vblank irqs under vblank_time_lock protection. 890 /* Enable vblank irqs under vblank_time_lock protection.
@@ -912,7 +904,6 @@ int drm_vblank_get(struct drm_device *dev, int crtc)
912 } 904 }
913 } 905 }
914 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags2); 906 spin_unlock_irqrestore(&dev->vblank_time_lock, irqflags2);
915 preempt_enable();
916 } else { 907 } else {
917 if (!dev->vblank_enabled[crtc]) { 908 if (!dev->vblank_enabled[crtc]) {
918 atomic_dec(&dev->vblank_refcount[crtc]); 909 atomic_dec(&dev->vblank_refcount[crtc]);