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Due to hardware timeout the session may be released before the remaining task is alll finished. So mpp_free_task could run after mpp_dev_release. Then the session used in mpp_free_task could be invalid and crash the thread. So we attach session to the mpp_taskqueue and let the work thread to destroy and release session later. NOTE: the session is created in mpp_dev_open and attached to corresponding taskqueue on client init. So when we release the session in mpp_dev_release if the session is not attached to certain taskqueue just release it immediately. Signed-off-by: Herman Chen <herman.chen@rock-chips.com> Change-Id: I9d4b2358154522e6bcde6e688592c0058781529a
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.
See Documentation/00-INDEX for a list of what is contained in each file.
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.