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video: tegra: nvmap: Take refcount on device during map

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When a dma_buf is getting mapped, take refcount on that device which
will is released when dma_buf is unmapped.
The device should be alive till all its buffers are unmapped.

Bug 4402923

Change-Id: I3ad257f5bdd7e705ac94bea6e81fef0fda46fbd2
Signed-off-by: Ashish Mhetre <amhetre@nvidia.com>
Reviewed-on: https://git-master.nvidia.com/r/c/linux-nv-oot/+/3079901
Tested-by: mobile promotions <svcmobile_promotions@nvidia.com>
Reviewed-by: mobile promotions <svcmobile_promotions@nvidia.com>
This commit is contained in:
Ashish Mhetre
2024-02-20 04:12:26 +00:00
committed by mobile promotions
parent 2664f7f2b7
commit ed7a856cf7
1 changed files with 4 additions and 0 deletions
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4
drivers/video/tegra/nvmap/nvmap_dmabuf.c
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@@ -180,8 +180,10 @@ static struct sg_table *nvmap_dmabuf_map_dma_buf(struct dma_buf_attachment *atta
if (sgt) if (sgt)
goto cache_hit; goto cache_hit;
get_device(attach->dev);
sgt = __nvmap_sg_table(NULL, info->handle); sgt = __nvmap_sg_table(NULL, info->handle);
if (IS_ERR(sgt)) { if (IS_ERR(sgt)) {
put_device(attach->dev);
atomic_dec(&info->handle->pin); atomic_dec(&info->handle->pin);
mutex_unlock(&info->maps_lock); mutex_unlock(&info->maps_lock);
return sgt; return sgt;
@@ -224,6 +226,7 @@ cache_hit:
err_map: err_map:
__nvmap_free_sg_table(NULL, info->handle, sgt); __nvmap_free_sg_table(NULL, info->handle, sgt);
put_device(attach->dev);
atomic_dec(&info->handle->pin); atomic_dec(&info->handle->pin);
mutex_unlock(&info->maps_lock); mutex_unlock(&info->maps_lock);
return ERR_PTR(-ENOMEM); return ERR_PTR(-ENOMEM);
@@ -247,6 +250,7 @@ static void __nvmap_dmabuf_unmap_dma_buf(struct nvmap_handle_sgt *nvmap_sgt)
dir, DMA_ATTR_SKIP_CPU_SYNC); dir, DMA_ATTR_SKIP_CPU_SYNC);
} }
__nvmap_free_sg_table(NULL, info->handle, sgt); __nvmap_free_sg_table(NULL, info->handle, sgt);
put_device(dev);
} }
static void nvmap_dmabuf_unmap_dma_buf(struct dma_buf_attachment *attach, static void nvmap_dmabuf_unmap_dma_buf(struct dma_buf_attachment *attach,