[PATCH v4 3/3] drm/panthor: Take reqs_lock in soft_reset for clearing pending_reqs

[Nicolas Frattaroli]

panthor_gpu_soft_reset() sets pending_reqs to 0 without taking the
requisite reqs_lock.

Fix this by taking the lock for the duration of the modification.

Fixes: 5cd894e258c4 ("drm/panthor: Add the GPU logical block")
Reviewed-by: Boris Brezillon <boris.brezillon@xxxxxxxxxxxxx>
Signed-off-by: Nicolas Frattaroli <nicolas.frattaroli@xxxxxxxxxxxxx>
---
 drivers/gpu/drm/panthor/panthor_gpu.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panthor/panthor_gpu.c b/drivers/gpu/drm/panthor/panthor_gpu.c
index 55e33f145b40..fb2702e1e0a2 100644
--- a/drivers/gpu/drm/panthor/panthor_gpu.c
+++ b/drivers/gpu/drm/panthor/panthor_gpu.c
@@ -424,7 +424,10 @@ int panthor_gpu_soft_reset(struct panthor_device *ptdev)
 		return -ETIMEDOUT;
 	}
 
-	ptdev->gpu->pending_reqs = 0;
+	scoped_guard(spinlock, &ptdev->gpu->reqs_lock) {
+		ptdev->gpu->pending_reqs = 0;
+	}
+
 	return 0;
 }
 

-- 
2.55.0