[PATCH v2 11/11] drm/qxl: add lock asserts to qxl_bo_vmap_locked + qxl_bo_vunmap_locked
From: Gerd Hoffmann <kraxel@redhat.com>
Date: 2021-02-17 12:35:50
Also in:
dri-devel, lkml
Subsystem:
drm driver for qxl virtual gpu, drm drivers, drm drivers and misc gpu patches, the rest · Maintainers:
Dave Airlie, Gerd Hoffmann, David Airlie, Simona Vetter, Maarten Lankhorst, Maxime Ripard, Thomas Zimmermann, Linus Torvalds
Try avoid re-introducing locking bugs. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> Acked-by: Thomas Zimmermann <tzimmermann@suse.de> --- drivers/gpu/drm/qxl/qxl_object.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/drivers/gpu/drm/qxl/qxl_object.c b/drivers/gpu/drm/qxl/qxl_object.c
index 82c3bf195ad6..6e26d70f2f07 100644
--- a/drivers/gpu/drm/qxl/qxl_object.c
+++ b/drivers/gpu/drm/qxl/qxl_object.c@@ -162,6 +162,8 @@ int qxl_bo_vmap_locked(struct qxl_bo *bo, struct dma_buf_map *map) { int r; + dma_resv_assert_held(bo->tbo.base.resv); + if (bo->kptr) { bo->map_count++; goto out;
@@ -236,6 +238,8 @@ void *qxl_bo_kmap_atomic_page(struct qxl_device *qdev, void qxl_bo_vunmap_locked(struct qxl_bo *bo) { + dma_resv_assert_held(bo->tbo.base.resv); + if (bo->kptr == NULL) return; bo->map_count--;
--
2.29.2
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