Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 58 insertions, 0 deletions

diff --git a/Documentation/media/uapi/v4l/func-munmap.rst b/Documentation/media/uapi/v4l/func-munmap.rst
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+.. -*- coding: utf-8; mode: rst -*-
+
+.. _func-munmap:
+
+*************
+V4L2 munmap()
+*************
+
+Name
+====
+
+v4l2-munmap - Unmap device memory
+
+
+Synopsis
+========
+
+.. code-block:: c
+
+    #include <unistd.h>
+    #include <sys/mman.h>
+
+
+.. c:function:: int munmap( void *start, size_t length )
+    :name: v4l2-munmap
+
+Arguments
+=========
+
+``start``
+    Address of the mapped buffer as returned by the
+    :ref:`mmap() <func-mmap>` function.
+
+``length``
+    Length of the mapped buffer. This must be the same value as given to
+    :ref:`mmap() <func-mmap>` and returned by the driver in the struct
+    :c:type:`v4l2_buffer` ``length`` field for the
+    single-planar API and in the struct
+    :c:type:`v4l2_plane` ``length`` field for the
+    multi-planar API.
+
+
+Description
+===========
+
+Unmaps a previously with the :ref:`mmap() <func-mmap>` function mapped
+buffer and frees it, if possible.
+
+
+Return Value
+============
+
+On success :ref:`munmap() <func-munmap>` returns 0, on failure -1 and the
+``errno`` variable is set appropriately:
+
+EINVAL
+    The ``start`` or ``length`` is incorrect, or no buffers have been
+    mapped yet.