drm: fixup i915 interrupt on X server exit

Fixes: IRQ disabled (i915?) when switchig between gnome themes (gnome-theme-manager)

Signed-off-by: Dave Airlie <airlied@linux.ie>

1 files changed, 5 insertions, 0 deletions

diff --git a/drivers/char/drm/i915_irq.c b/drivers/char/drm/i915_irq.c
index a1381c61aa63..d3879ac9970f 100644
--- a/drivers/char/drm/i915_irq.c
+++ b/drivers/char/drm/i915_irq.c
@@ -202,10 +202,15 @@ void i915_driver_irq_postinstall(drm_device_t * dev)
 void i915_driver_irq_uninstall(drm_device_t * dev)
 {
         drm_i915_private_t *dev_priv = (drm_i915_private_t *) dev->dev_private;
+        u16 temp;
+
         if (!dev_priv)
                 return;
 
         I915_WRITE16(I915REG_HWSTAM, 0xffff);
         I915_WRITE16(I915REG_INT_MASK_R, 0xffff);
         I915_WRITE16(I915REG_INT_ENABLE_R, 0x0);
+
+        temp = I915_READ16(I915REG_INT_IDENTITY_R);
+        I915_WRITE16(I915REG_INT_IDENTITY_R, temp);
 }