linux-kernel - [PATCH v0 07/42] drm/i915: Check notifier registration return value

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Date:   Mon,  8 Nov 2021 11:11:22 +0100
From:   Borislav Petkov <bp@...en8.de>
To:     LKML <linux-kernel@...r.kernel.org>
Cc:     intel-gvt-dev@...ts.freedesktop.org,
        intel-gfx@...ts.freedesktop.org
Subject: [PATCH v0 07/42] drm/i915: Check notifier registration return value

From: Borislav Petkov <bp@...e.de>

Avoid homegrown notifier registration checks.

No functional changes.

Signed-off-by: Borislav Petkov <bp@...e.de>
Cc: intel-gvt-dev@...ts.freedesktop.org
Cc: intel-gfx@...ts.freedesktop.org
---
 drivers/gpu/drm/i915/gvt/scheduler.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/i915/gvt/scheduler.c b/drivers/gpu/drm/i915/gvt/scheduler.c
index 6c804102528b..3bafaca5789f 100644
--- a/drivers/gpu/drm/i915/gvt/scheduler.c
+++ b/drivers/gpu/drm/i915/gvt/scheduler.c
@@ -1277,8 +1277,10 @@ int intel_gvt_init_workload_scheduler(struct intel_gvt *gvt)
 
 		gvt->shadow_ctx_notifier_block[i].notifier_call =
 					shadow_context_status_change;
-		atomic_notifier_chain_register(&engine->context_status_notifier,
-					&gvt->shadow_ctx_notifier_block[i]);
+
+		if (atomic_notifier_chain_register(&engine->context_status_notifier,
+						   &gvt->shadow_ctx_notifier_block[i]))
+			pr_warn("Context status notifier %d already registered\n", i);
 	}
 
 	return 0;
-- 
2.29.2