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: [email protected]
Signed-off-by: Osama Abdelkader <[email protected]>
---
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
