FAILED: patch "[PATCH] drm/i915: Only skip requests once a context is banned" failed to apply to 4.10-stable tree

[<gregkh@linuxfoundation.org>]

The patch below does not apply to the 4.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@vger.kernel.org>.

thanks,

greg k-h

------------------ original commit in Linus's tree ------------------

>From 7ec73b7e36d0bf165cea77770a490fcdf4418e93 Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Thu, 5 Jan 2017 17:00:59 +0000
Subject: [PATCH] drm/i915: Only skip requests once a context is banned

If we skip before banning, we have an inconsistent interface between
execbuf still queueing valid request but those requests already queued
being cancelled. If we only cancel the pending requests once we stop
accepting new requests, the user interface is more consistent.

Reported-by: Tvrtko Ursulin <tvrtko.ursulin@linux.intel.com>
Fixes: 821ed7df6e2a ("drm/i915: Update reset path to fix incomplete requests")
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Mika Kuoppala <mika.kuoppala@intel.com>
Cc: <stable@vger.kernel.org> # v4.9+
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Link: http://patchwork.freedesktop.org/patch/msgid/20170105170059.344-1-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/i915/i915_gem.c b/drivers/gpu/drm/i915/i915_gem.c
index 70ddff3570bb..e60467271898 100644
--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -2734,7 +2734,7 @@ void i915_gem_reset_prepare(struct drm_i915_private *dev_priv)
 static void i915_gem_reset_engine(struct intel_engine_cs *engine)
 {
 	struct drm_i915_gem_request *request;
-	struct i915_gem_context *incomplete_ctx;
+	struct i915_gem_context *hung_ctx;
 	struct intel_timeline *timeline;
 	unsigned long flags;
 	bool ring_hung;
@@ -2746,6 +2746,8 @@ static void i915_gem_reset_engine(struct intel_engine_cs *engine)
 	if (!request)
 		return;
 
+	hung_ctx = request->ctx;
+
 	ring_hung = engine->hangcheck.stalled;
 	if (engine->hangcheck.seqno != intel_engine_get_seqno(engine)) {
 		DRM_DEBUG_DRIVER("%s pardoned, was guilty? %s\n",
@@ -2755,9 +2757,9 @@ static void i915_gem_reset_engine(struct intel_engine_cs *engine)
 	}
 
 	if (ring_hung)
-		i915_gem_context_mark_guilty(request->ctx);
+		i915_gem_context_mark_guilty(hung_ctx);
 	else
-		i915_gem_context_mark_innocent(request->ctx);
+		i915_gem_context_mark_innocent(hung_ctx);
 
 	if (!ring_hung)
 		return;
@@ -2768,6 +2770,10 @@ static void i915_gem_reset_engine(struct intel_engine_cs *engine)
 	/* Setup the CS to resume from the breadcrumb of the hung request */
 	engine->reset_hw(engine, request);
 
+	/* If this context is now banned, skip all of its pending requests. */
+	if (!i915_gem_context_is_banned(hung_ctx))
+		return;
+
 	/* Users of the default context do not rely on logical state
 	 * preserved between batches. They have to emit full state on
 	 * every batch and so it is safe to execute queued requests following
@@ -2776,17 +2782,16 @@ static void i915_gem_reset_engine(struct intel_engine_cs *engine)
 	 * Other contexts preserve state, now corrupt. We want to skip all
 	 * queued requests that reference the corrupt context.
 	 */
-	incomplete_ctx = request->ctx;
-	if (i915_gem_context_is_default(incomplete_ctx))
+	if (i915_gem_context_is_default(hung_ctx))
 		return;
 
-	timeline = i915_gem_context_lookup_timeline(incomplete_ctx, engine);
+	timeline = i915_gem_context_lookup_timeline(hung_ctx, engine);
 
 	spin_lock_irqsave(&engine->timeline->lock, flags);
 	spin_lock(&timeline->lock);
 
 	list_for_each_entry_continue(request, &engine->timeline->requests, link)
-		if (request->ctx == incomplete_ctx)
+		if (request->ctx == hung_ctx)
 			reset_request(request);
 
 	list_for_each_entry(request, &timeline->requests, link)