[PATCH] drm/msm: skip re-emitting IBs for unusable VMs

[Antonino Maniscalco]

When a VM is marked as an usuable we disallow new submissions from it,
however submissions that where already scheduled on the ring would still
be re-sent.

Since this can lead to further hangs, avoid emitting the actual IBs.

Fixes: 6a4d287a1ae6 ("drm/msm: Mark VM as unusable on GPU hangs")
Signed-off-by: Antonino Maniscalco <antomani...@gmail.com>
---
 drivers/gpu/drm/msm/msm_gpu.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index 
c317b25a8162edba0d594f61427eac4440871b73..e6cd85c810bd2314c8bba53644a622464713b7f2
 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -553,8 +553,15 @@ static void recover_worker(struct kthread_work *work)
                        unsigned long flags;
 
                        spin_lock_irqsave(&ring->submit_lock, flags);
-                       list_for_each_entry(submit, &ring->submits, node)
+                       list_for_each_entry(submit, &ring->submits, node) {
+                               /*
+                                * If the submit uses an unusable vm make sure
+                                * we don't actually run it
+                                */
+                               if (to_msm_vm(submit->vm)->unusable)
+                                       submit->nr_cmds = 0;
                                gpu->funcs->submit(gpu, submit);
+                       }
                        spin_unlock_irqrestore(&ring->submit_lock, flags);
                }
        }

---
base-commit: 8290d37ad2b087bbcfe65fa5bcaf260e184b250a
change-id: 20250813-unusable_fix_b4-10bde6f3b756

Best regards,
-- 
Antonino Maniscalco <antomani...@gmail.com>