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Some hardware and bridges (namely ddbridge) require that tuner access is limited to one concurrent access and wrap i2c gate control with a mutex_lock when attaching frontends. According to vendor information, this is required as concurrent tuner reconfiguration can interfere each other and at worst cause tuning fails or bad reception quality. If the demod driver does gate_ctrl before setting up tuner parameters, and the tuner does another I2C enable, it will deadlock forever when gate_ctrl is wrapped into the mutex_lock. This adds a flag and a conditional before triggering gate_ctrl in the demodulator driver. Signed-off-by: Daniel Scheller <d.scheller@gmx.net> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. 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.