This is a note to let you know that I've just added the patch titled
drm/i915: Fix oopses in the overlay code due to i915_gem_active stuff
to the 4.9-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-fix-oopses-in-the-overlay-code-due-to-i915_gem_active-stuff.patch
and it can be found in the queue-4.9 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b72eb5ffa6d8601d9ba72619d75fb5b27723743a Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ville=20Syrj=C3=A4l=C3=A4?= <ville.syrjala@xxxxxxxxxxxxxxx>
Date: Wed, 7 Dec 2016 17:56:47 +0000
Subject: drm/i915: Fix oopses in the overlay code due to i915_gem_active stuff
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From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
commit b72eb5ffa6d8601d9ba72619d75fb5b27723743a upstream.
The i915_gem_active stuff doesn't like a NULL ->retire hook, but
the overlay code can set it to NULL. That obviously ends up oopsing.
Fix it by introducing a new helper to assign the retirement callback
that will switch out the NULL function pointer with
i915_gem_retire_noop.
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Fixes: 0d9bdd886f29 ("drm/i915: Convert intel_overlay to request tracking")
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Signed-off-by: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Link: http://patchwork.freedesktop.org/patch/msgid/20161207175647.10018-1-chris@xxxxxxxxxxxxxxxxxx
(cherry picked from commit ecd9caa0522db5a6b03ac8858c42067ef9d8323b)
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/i915_gem_request.h | 19 +++++++++++++++++++
drivers/gpu/drm/i915/intel_overlay.c | 3 ++-
2 files changed, 21 insertions(+), 1 deletion(-)
--- a/drivers/gpu/drm/i915/i915_gem_request.h
+++ b/drivers/gpu/drm/i915/i915_gem_request.h
@@ -344,6 +344,25 @@ i915_gem_active_set(struct i915_gem_acti
rcu_assign_pointer(active->request, request);
}
+/**
+ * i915_gem_active_set_retire_fn - updates the retirement callback
+ * @active - the active tracker
+ * @fn - the routine called when the request is retired
+ * @mutex - struct_mutex used to guard retirements
+ *
+ * i915_gem_active_set_retire_fn() updates the function pointer that
+ * is called when the final request associated with the @active tracker
+ * is retired.
+ */
+static inline void
+i915_gem_active_set_retire_fn(struct i915_gem_active *active,
+ i915_gem_retire_fn fn,
+ struct mutex *mutex)
+{
+ lockdep_assert_held(mutex);
+ active->retire = fn ?: i915_gem_retire_noop;
+}
+
static inline struct drm_i915_gem_request *
__i915_gem_active_peek(const struct i915_gem_active *active)
{
--- a/drivers/gpu/drm/i915/intel_overlay.c
+++ b/drivers/gpu/drm/i915/intel_overlay.c
@@ -216,7 +216,8 @@ static void intel_overlay_submit_request
{
GEM_BUG_ON(i915_gem_active_peek(&overlay->last_flip,
&overlay->i915->drm.struct_mutex));
- overlay->last_flip.retire = retire;
+ i915_gem_active_set_retire_fn(&overlay->last_flip, retire,
+ &overlay->i915->drm.struct_mutex);
i915_gem_active_set(&overlay->last_flip, req);
i915_add_request(req);
}
Patches currently in stable-queue which might be from ville.syrjala@xxxxxxxxxxxxxxx are
queue-4.9/drm-i915-fix-oopses-in-the-overlay-code-due-to-i915_gem_active-stuff.patch
queue-4.9/drm-i915-initialize-overlay-last_flip-properly.patch
queue-4.9/drm-i915-force-vdd-off-on-the-new-power-seqeuencer-before-starting-to-use-it.patch
queue-4.9/drm-i915-fix-oops-in-overlay-due-to-frontbuffer-tracking.patch
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