82d87b12e1
commit c7860cbee9989882d2908682526a5ef617523cfe upstream. The code assumes that Tegra GEM is permanently vmapped, which is not true for the scattered buffers. After converting Tegra video decoder driver to V4L API, we're now getting a BUG_ON from dma-buf core on playing video using libvdpau-tegra on T30+ because tegra_gem_prime_vmap() sets vaddr to NULL. Older pre-V4L video decoder driver wasn't vmapping dma-bufs. Fix it by actually vmapping the exported GEMs. Cc: stable@vger.kernel.org Signed-off-by: Dmitry Osipenko <dmitry.osipenko@collabora.com> Signed-off-by: Thierry Reding <treding@nvidia.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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.