[PATCH 1/2] drm/i915: kill set_need_resched

Daniel Vetter daniel.vetter at ffwll.ch
Thu Sep 12 08:57:28 PDT 2013

This is just a remnant from the old days when our reset handling was
horribly racy, suffered from terribly locking issues and often happily
live-locked. Those days are now gone so we can drop the hacks and just
rip the reschedule-point out.

Reported-by: Peter Zijlstra <peterz at infradead.org>
Cc: Peter Zijlstra <peterz at infradead.org>
Cc: Linux Kernel Mailing List <linux-kernel at vger.kernel.org>
Signed-off-by: Daniel Vetter <daniel.vetter at ffwll.ch>
 drivers/gpu/drm/i915/i915_gem.c | 11 ++++-------
 1 file changed, 4 insertions(+), 7 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index d80f33d..3871060 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -1389,14 +1389,11 @@ out:
 		if (i915_terminally_wedged(&dev_priv->gpu_error))
 			return VM_FAULT_SIGBUS;
 	case -EAGAIN:
-		/* Give the error handler a chance to run and move the
-		 * objects off the GPU active list. Next time we service the
-		 * fault, we should be able to transition the page into the
-		 * GTT without touching the GPU (and so avoid further
-		 * EIO/EGAIN). If the GPU is wedged, then there is no issue
-		 * with coherency, just lost writes.
+		/*
+		 * EAGAIN means the gpu is hung and we'll wait for the error
+		 * handler to reset everything when re-faulting in
+		 * i915_mutex_lock_interruptible.
-		set_need_resched();
 	case 0:
 	case -EINTR:

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