da0dd507fa
atomisp_release() was taking pipe->vb_queue_mutex + isp->mutex at the same time. But if the /dev/video# node is closed while still streaming then vb2_queue_release() will call atomisp_stop_streaming() which takes isp->mutex itself, leading to a deadlock. To fix this only take isp->mutex after cleaning up the v4l2_fh / the vb2_queue. While at it switch to vb2_fop_release() which will take pipe->vb_queue_mutex for us, which also resolves a FIXME comment. Reviewed-by: Andy Shevchenko <andy@kernel.org> Signed-off-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.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.