[Intel-gfx] Patch "drm/i915/active: Fix missing debug object activation" has been added to the 5.15-stable tree

[gregkh at linuxfoundation.org]

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

    drm/i915/active: Fix missing debug object activation

to the 5.15-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-active-fix-missing-debug-object-activation.patch
and it can be found in the queue-5.15 subdirectory.

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


>From e92eb246feb9019b0b137706c934b8891cdfe3c2 Mon Sep 17 00:00:00 2001
From: Nirmoy Das <nirmoy.das at intel.com>
Date: Tue, 14 Mar 2023 15:29:14 +0100
Subject: drm/i915/active: Fix missing debug object activation
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

From: Nirmoy Das <nirmoy.das at intel.com>

commit e92eb246feb9019b0b137706c934b8891cdfe3c2 upstream.

debug_active_activate() expected ref->count to be zero
which is not true anymore as __i915_active_activate() calls
debug_active_activate() after incrementing the count.

v2: No need to check for "ref->count == 1" as __i915_active_activate()
already make sure of that(Janusz).

References: https://gitlab.freedesktop.org/drm/intel/-/issues/6733
Fixes: 04240e30ed06 ("drm/i915: Skip taking acquire mutex for no ref->active callback")
Cc: Chris Wilson <chris at chris-wilson.co.uk>
Cc: Tvrtko Ursulin <tvrtko.ursulin at intel.com>
Cc: Thomas Hellström <thomas.hellstrom at intel.com>
Cc: Andi Shyti <andi.shyti at linux.intel.com>
Cc: intel-gfx at lists.freedesktop.org
Cc: Janusz Krzysztofik <janusz.krzysztofik at linux.intel.com>
Cc: <stable at vger.kernel.org> # v5.10+
Signed-off-by: Nirmoy Das <nirmoy.das at intel.com>
Reviewed-by: Janusz Krzysztofik <janusz.krzysztofik at linux.intel.com>
Reviewed-by: Andrzej Hajda <andrzej.hajda at intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230313114613.9874-1-nirmoy.das@intel.com
(cherry picked from commit bfad380c542438a9b642f8190b7fd37bc77e2723)
Signed-off-by: Jani Nikula <jani.nikula at intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 drivers/gpu/drm/i915/i915_active.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/gpu/drm/i915/i915_active.c
+++ b/drivers/gpu/drm/i915/i915_active.c
@@ -92,8 +92,7 @@ static void debug_active_init(struct i91
 static void debug_active_activate(struct i915_active *ref)
 {
 	lockdep_assert_held(&ref->tree_lock);
-	if (!atomic_read(&ref->count)) /* before the first inc */
-		debug_object_activate(ref, &active_debug_desc);
+	debug_object_activate(ref, &active_debug_desc);
 }
 
 static void debug_active_deactivate(struct i915_active *ref)


Patches currently in stable-queue which might be from nirmoy.das at intel.com are

queue-5.15/drm-i915-gt-perform-uc-late-init-after-probe-error-i.patch
queue-5.15/drm-i915-active-fix-missing-debug-object-activation.patch