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- Add spinlock for protecting legacy mask register - Few wifi end points which only support legacy interrupts, performs hardware reset functionalities after disabling interrupts by invoking disable_irq() and then re-enable using enable_irq(), they enable hardware interrupts first and then virtual IRQ line later. - The legacy IRQ line goes low only after DEASSERT_INTx is received. As the legacy IRQ line is high immediately after hardware interrupts are enabled but virq of EP is still in disabled state and EP handler is never executed resulting no DEASSERT_INTx. If dummy IRQ chip is used, interrupts are not masked and system hangs with CPU stall. - Add IRQ chip functions instead of dummy IRQ chip for legacy interrupts. - Legacy interrupts are level sensitive, so using handle_level_irq() is more appropriate as it is masks interrupts until Endpoint handles interrupts and unmasks interrupts after Endpoint handler is executed. - Legacy interrupts are level triggered, virtual IRQ line of EndPoint shows as edge in /proc/interrupts. - Set IRQ flags of virtual IRQ line of EP to level triggered at the time of mapping. Signed-off-by: Bharat Kumar Gogada <bharatku@xilinx.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.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.