[PATCH 6.12.y 3/3] drm/v3d: Release indirect CSD GEM reference on CPU job free

[Sasha Levin <sashal@kernel.org>]

From: Maíra Canal <mcanal@igalia.com>

[ Upstream commit 6eb6e5acafa46854d4363e6c34981289995f3ace ]

v3d_get_cpu_indirect_csd_params() takes a reference to the indirect BO via
drm_gem_object_lookup() and stashes it in cpu_job->indirect_csd.indirect,
but nothing on the CPU job teardown path ever drops that reference.

Drop the extra reference in v3d_cpu_job_free(). The NULL check covers ioctl
errors before the lookup ran and CPU job types other than
V3D_CPU_JOB_TYPE_INDIRECT_CSD, which leave the field zero-initialised.

Cc: stable@vger.kernel.org
Fixes: 18b8413b25b7 ("drm/v3d: Create a CPU job extension for a indirect CSD job")
Assisted-by: Claude:claude-opus-4.7
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
Link: https://patch.msgid.link/20260515-v3d-cpu-job-leaks-v1-2-7f147cbbf935@igalia.com
Signed-off-by: Maíra Canal <mcanal@igalia.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/gpu/drm/v3d/v3d_submit.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/v3d/v3d_submit.c b/drivers/gpu/drm/v3d/v3d_submit.c
index 40c21aaade0d6..23472c7af41a9 100644
--- a/drivers/gpu/drm/v3d/v3d_submit.c
+++ b/drivers/gpu/drm/v3d/v3d_submit.c
@@ -130,6 +130,9 @@ v3d_cpu_job_free(struct kref *ref)
 	v3d_performance_query_info_free(&job->performance_query,
 					job->performance_query.count);
 
+	if (job->indirect_csd.indirect)
+		drm_gem_object_put(job->indirect_csd.indirect);
+
 	v3d_job_free(ref);
 }
 
-- 
2.53.0