drm/i915: Eliminate loop from VLV irq handler

Now that we've dealt with the races in clearing IIR bits via VLV_IER
and the master interrupt enable, we can go ahead aliminate the loop
from the VLV interrupt handler.

Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/1460571598-24452-7-git-send-email-ville.syrjala@linux.intel.com
Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c
index 6c9b369..9488496 100644 (file)
--- a/drivers/gpu/drm/i915/i915_irq.c
+++ b/drivers/gpu/drm/i915/i915_irq.c
@@ -1777,7 +1777,7 @@ static irqreturn_t valleyview_irq_handler(int irq, void *arg)
        /* IRQs are synced during runtime_suspend, we don't require a wakeref */
        disable_rpm_wakeref_asserts(dev_priv);
 
-       while (true) {
+       do {
                u32 ier = 0;
 
                gt_iir = I915_READ(GTIIR);
@@ -1785,7 +1785,7 @@ static irqreturn_t valleyview_irq_handler(int irq, void *arg)
                iir = I915_READ(VLV_IIR);
 
                if (gt_iir == 0 && pm_iir == 0 && iir == 0)
-                       goto out;
+                       break;
 
                ret = IRQ_HANDLED;
 
@@ -1833,9 +1833,8 @@ static irqreturn_t valleyview_irq_handler(int irq, void *arg)
                I915_WRITE(VLV_IER, ier);
                I915_WRITE(VLV_MASTER_IER, MASTER_INTERRUPT_ENABLE);
                POSTING_READ(VLV_MASTER_IER);
-       }
+       } while (0);
 
-out:
        enable_rpm_wakeref_asserts(dev_priv);
 
        return ret;