On Wed, Nov 1, 2017 at 10:06 AM, Liviu Dudau Liviu.Dudau@arm.com wrote:
Mappings need to be unmapped by calling dma_buf_unmap_attachment() and not by calling again dma_buf_map_attachment(). Also fix some spelling mistakes.
Signed-off-by: Liviu Dudau liviu.dudau@arm.com
Reviewed-by: Alex Deucher alexander.deucher@amd.com
drivers/dma-buf/dma-buf.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index bc1cb284111cb..1792385405f0e 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -351,13 +351,13 @@ static inline int is_dma_buf_file(struct file *file)
- Userspace passes this file-descriptors to all drivers it wants this buffer
- to share with: First the filedescriptor is converted to a &dma_buf using
- dma_buf_get(). The the buffer is attached to the device using
- dma_buf_get(). Then the buffer is attached to the device using
- dma_buf_attach().
- Up to this stage the exporter is still free to migrate or reallocate the
- backing storage.
- Once the buffer is attached to all devices userspace can inniate DMA
- Once the buffer is attached to all devices userspace can initiate DMA
- access to the shared buffer. In the kernel this is done by calling
- dma_buf_map_attachment() and dma_buf_unmap_attachment().
@@ -617,7 +617,7 @@ EXPORT_SYMBOL_GPL(dma_buf_detach);
- Returns sg_table containing the scatterlist to be returned; returns ERR_PTR
- on error. May return -EINTR if it is interrupted by a signal.
- A mapping must be unmapped again using dma_buf_map_attachment(). Note that
- A mapping must be unmapped by using dma_buf_unmap_attachment(). Note that
- the underlying backing storage is pinned for as long as a mapping exists,
- therefore users/importers should not hold onto a mapping for undue amounts of
- time.
-- 2.14.3
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