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([2a02:908:185:7e40:b0cf:778:ae86:13b1]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-49977ea5440sm24136825e9.3.2026.08.11.07.33.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 11 Aug 2026 07:33:56 -0700 (PDT) From: Osama Abdelkader To: Boris Brezillon , Steven Price , Liviu Dudau , Maarten Lankhorst , Maxime Ripard , Thomas Zimmermann , David Airlie , Simona Vetter , Heiko Stuebner , dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org Cc: Osama Abdelkader , stable@vger.kernel.org Subject: [PATCH] drm/panthor: ignore CS IRQs for uninitialized slots Date: Tue, 11 Aug 2026 16:33:18 +0200 Message-ID: <20260811143318.46446-1-osama.abdelkader@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit CS interrupts are reported through firmware-provided bits in the CSG interface. sched_process_csg_irq_locked() iterates over those bits and passes each CS ID to cs_slot_process_irq_locked(). panthor_fw_get_cs_iface() only bounds the CS ID against MAX_CS_PER_CSG, while the firmware can expose fewer CS slots. If an IRQ bit is reported for a slot beyond sched->cs_slot_count, the driver can fetch a zero-initialized interface entry and dereference cs_iface->input. Ignore IRQs for slots that were not exposed by the firmware. The CSG IRQ acknowledgment is already updated from cs_irq_req before processing the individual CS IRQs, so ignored bits are still acknowledged. Fixes: de8548813824 ("drm/panthor: Add the scheduler logical block") Cc: stable@vger.kernel.org Signed-off-by: Osama Abdelkader --- drivers/gpu/drm/panthor/panthor_sched.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/gpu/drm/panthor/panthor_sched.c b/drivers/gpu/drm/panthor/panthor_sched.c index 64749750e6ee..1e230936e99c 100644 --- a/drivers/gpu/drm/panthor/panthor_sched.c +++ b/drivers/gpu/drm/panthor/panthor_sched.c @@ -1705,6 +1705,9 @@ static bool cs_slot_process_irq_locked(struct panthor_device *ptdev, lockdep_assert_held(&ptdev->scheduler->lock); + if (cs_id >= ptdev->scheduler->cs_slot_count) + return false; + cs_iface = panthor_fw_get_cs_iface(ptdev, csg_id, cs_id); req = cs_iface->input->req; ack = cs_iface->output->ack; -- 2.43.0