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Subject[PATCH v7 15/21] dma-buf: Move dma_buf_vmap() to dynamic locking specification
Date
Move dma_buf_vmap/vunmap() functions to the dynamic locking
specification by asserting that the reservation lock is held.

Acked-by: Sumit Semwal <sumit.semwal@linaro.org>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com>
---
drivers/dma-buf/dma-buf.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 3e4060dadb74..2c4381bb9478 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -1450,6 +1450,8 @@ int dma_buf_vmap(struct dma_buf *dmabuf, struct iosys_map *map)
if (WARN_ON(!dmabuf))
return -EINVAL;

+ dma_resv_assert_held(dmabuf->resv);
+
if (!dmabuf->ops->vmap)
return -EINVAL;

@@ -1515,6 +1517,8 @@ void dma_buf_vunmap(struct dma_buf *dmabuf, struct iosys_map *map)
if (WARN_ON(!dmabuf))
return;

+ dma_resv_assert_held(dmabuf->resv);
+
BUG_ON(iosys_map_is_null(&dmabuf->vmap_ptr));
BUG_ON(dmabuf->vmapping_counter == 0);
BUG_ON(!iosys_map_is_equal(&dmabuf->vmap_ptr, map));
--
2.37.3
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