linux-kernel - [PATCH 5.10.y] drm/i915/gt: Cleanup partial engine discovery failures

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Message-Id: <20250409025809.2812082-1-Zhi.Yang@eng.windriver.com>
Date: Wed,  9 Apr 2025 10:58:09 +0800
From: Zhi Yang <Zhi.Yang@....windriver.com>
To: stable@...r.kernel.org, chris.p.wilson@...el.com
Cc: xiangyu.chen@...driver.com, zhe.he@...driver.com,
        jani.nikula@...ux.intel.com, joonas.lahtinen@...ux.intel.com,
        rodrigo.vivi@...el.com, airlied@...ux.ie, daniel@...ll.ch,
        matthew.d.roper@...el.com, Zhi.Yang@...driver.com,
        janusz.krzysztofik@...ux.intel.com, intel-gfx@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org
Subject: [PATCH 5.10.y] drm/i915/gt: Cleanup partial engine discovery failures

From: Chris Wilson <chris.p.wilson@...el.com>

commit 78a033433a5ae4fee85511ee075bc9a48312c79e upstream.

If we abort driver initialisation in the middle of gt/engine discovery,
some engines will be fully setup and some not. Those incompletely setup
engines only have 'engine->release == NULL' and so will leak any of the
common objects allocated.

v2:
 - Drop the destroy_pinned_context() helper for now.  It's not really
   worth it with just a single callsite at the moment.  (Janusz)

Signed-off-by: Chris Wilson <chris.p.wilson@...el.com>
Cc: Janusz Krzysztofik <janusz.krzysztofik@...ux.intel.com>
Signed-off-by: Matt Roper <matthew.d.roper@...el.com>
Reviewed-by: Janusz Krzysztofik <janusz.krzysztofik@...ux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220915232654.3283095-2-matthew.d.roper@intel.com
Signed-off-by: Zhi Yang <Zhi.Yang@...driver.com>
Signed-off-by: He Zhe <zhe.he@...driver.com>
---
Build test passed.
---
 drivers/gpu/drm/i915/gt/intel_engine_cs.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/gt/intel_engine_cs.c b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
index a19537706ed1..eb6f4d7f1e34 100644
--- a/drivers/gpu/drm/i915/gt/intel_engine_cs.c
+++ b/drivers/gpu/drm/i915/gt/intel_engine_cs.c
@@ -904,8 +904,13 @@ int intel_engines_init(struct intel_gt *gt)
 			return err;
 
 		err = setup(engine);
-		if (err)
+		if (err) {
+			intel_engine_cleanup_common(engine);
 			return err;
+		}
+
+		/* The backend should now be responsible for cleanup */
+		GEM_BUG_ON(engine->release == NULL);
 
 		err = engine_init_common(engine);
 		if (err)
-- 
2.34.1