Patch "drm/i915: Pass timeout==0 on to i915_gem_object_wait_fence()" has been added to the 4.10-stable tree

Patch "drm/i915: Pass timeout==0 on to i915_gem_object_wait_fence()" has been added to the 4.10-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    drm/i915: Pass timeout==0 on to i915_gem_object_wait_fence()

to the 4.10-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     drm-i915-pass-timeout-0-on-to-i915_gem_object_wait_fence.patch
and it can be found in the queue-4.10 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 636deb5b2277cf57bb0f5e00fc9687de9a96061e Mon Sep 17 00:00:00 2001
From: Chris Wilson <chris@chris-wilson.co.uk>
Date: Sun, 12 Feb 2017 21:53:43 +0000
Subject: drm/i915: Pass timeout==0 on to i915_gem_object_wait_fence()

From: Chris Wilson <chris@chris-wilson.co.uk>

commit 636deb5b2277cf57bb0f5e00fc9687de9a96061e upstream.

The i915_gem_object_wait_fence() uses an incoming timeout=0 to query
whether the current fence is busy or idle, without waiting. This can be
used by the wait-ioctl to implement a busy query.

Fixes: e95433c73a11 ("drm/i915: Rearrange i915_wait_request() accounting with callers")
Testcase: igt/gem_wait/basic-busy-write-all
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Matthew Auld <matthew.william.auld@gmail.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: <drm-intel-fixes@lists.freedesktop.org> # v4.10-rc1+
Link: http://patchwork.freedesktop.org/patch/msgid/20170212215344.16600-1-chris@chris-wilson.co.uk
Reviewed-by: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
(cherry picked from commit d892e9398ecf6defc7972a62227b77dad6be20bd)
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/gpu/drm/i915/i915_gem.c |    4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

--- a/drivers/gpu/drm/i915/i915_gem.c
+++ b/drivers/gpu/drm/i915/i915_gem.c
@@ -440,7 +440,7 @@ i915_gem_object_wait_reservation(struct
 			timeout = i915_gem_object_wait_fence(shared[i],
 							     flags, timeout,
 							     rps);
-			if (timeout <= 0)
+			if (timeout < 0)
 				break;
 
 			dma_fence_put(shared[i]);
@@ -453,7 +453,7 @@ i915_gem_object_wait_reservation(struct
 		excl = reservation_object_get_excl_rcu(resv);
 	}
 
-	if (excl && timeout > 0)
+	if (excl && timeout >= 0)
 		timeout = i915_gem_object_wait_fence(excl, flags, timeout, rps);
 
 	dma_fence_put(excl);


Patches currently in stable-queue which might be from chris@chris-wilson.co.uk are

queue-4.10/drm-i915-recreate-internal-objects-with-single-page-segments-if-dmar-fails.patch
queue-4.10/drm-cancel-drm_fb_helper_dirty_work-on-unload.patch
queue-4.10/drm-i915-gvt-disable-access-to-stolen-memory-as-a-guest.patch
queue-4.10/drm-i915-check-for-timeout-completion-when-waiting-for-the-rq-to-submitted.patch
queue-4.10/drm-cancel-drm_fb_helper_resume_work-on-unload.patch
queue-4.10/drm-i915-pass-timeout-0-on-to-i915_gem_object_wait_fence.patch