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The rockchip_gem_mmap_buf() will call .mmap() of struct drm_gem_object_funcs twice; One is: rockchip_gem_mmap_buf() -> drm_gem_mmap_obj() -> rockchip_gem_object_funcs.mmap() -> rockchip_drm_gem_object_mmap() The other is: rockchip_gem_mmap_buf()-> rockchip_drm_gem_object_mmap() This will cause the -EBUSY return of vm_map_pages() ultimately. Change-Id: I3de9eb23f81afa437087e2276d16dd8fb4c003d6 Signed-off-by: Damon Ding <damon.ding@rock-chips.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.