drm/msm: Fix null pointer dereferences without iommu

Commit Message

Luca Weiss April 21, 2022, 8:34 p.m. UTC

Check if 'aspace' is set before using it as it will stay null without
IOMMU, such as on msm8974.

Fixes: bc2112583a0b ("drm/msm/gpu: Track global faults per address-space")
Signed-off-by: Luca Weiss <[e-mail]>
---
 drivers/gpu/drm/msm/adreno/adreno_gpu.c | 5 ++++-
 drivers/gpu/drm/msm/msm_gpu.c           | 3 ++-
 2 files changed, 6 insertions(+), 2 deletions(-)

Patch

diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 9efc84929be0..1219f71629a5 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -272,7 +272,10 @@  int adreno_get_param(struct msm_gpu *gpu, struct msm_file_private *ctx,
 		*value = 0;
 		return 0;
 	case MSM_PARAM_FAULTS:
-		*value = gpu->global_faults + ctx->aspace->faults;
+		if (ctx->aspace)
+			*value = gpu->global_faults + ctx->aspace->faults;
+		else
+			*value = gpu->global_faults;
 		return 0;
 	case MSM_PARAM_SUSPENDS:
 		*value = gpu->suspend_count;
diff --git a/drivers/gpu/drm/msm/msm_gpu.c b/drivers/gpu/drm/msm/msm_gpu.c
index faf0c242874e..58eb3e1662cb 100644
--- a/drivers/gpu/drm/msm/msm_gpu.c
+++ b/drivers/gpu/drm/msm/msm_gpu.c
@@ -371,7 +371,8 @@  static void recover_worker(struct kthread_work *work)
 
 		/* Increment the fault counts */
 		submit->queue->faults++;
-		submit->aspace->faults++;
+		if (submit->aspace)
+			submit->aspace->faults++;
 
 		task = get_pid_task(submit->pid, PIDTYPE_PID);
 		if (task) {