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Orson Zhai authored
[ Upstream commit 9468ab84 ]

Unisoc mailbox has no way to be enabled/disabled for any single channel.
They can only be set to startup or shutdown as a whole device at same time.

Add a variable to count references to avoid mailbox FIFO being reset
unexpectedly when clients are requesting or freeing channels.

Also add a lock to dismiss possible conflicts from register r/w in
different startup or shutdown threads. And fix the crash problem when early
interrupts come from channel which has not been requested by client yet.

Fixes: ca27fc26 ("mailbox: sprd: Add Spreadtrum mailbox driver")
Signed-off-by: default avatarOrson Zhai <orson.zhai@unisoc.com>
Reviewed-by: default avatarBaolin Wang <baolin.wang7@gmail.com>
Signed-off-by: default avatarJassi Brar <jaswinder.singh@linaro.org>
Signed-off-by: default avatarSasha Levin <sashal@kernel.org>
cadbba5e
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.