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[ Upstream commit865f5b671b] The threaded IRQ handler is used for the tcan4x5x driver only. The IRQ pin of the tcan4x5x controller is active low, so better not use IRQF_TRIGGER_FALLING when requesting the IRQ. As this can result in missing interrupts. Further, if the device tree specified the interrupt as "IRQ_TYPE_LEVEL_LOW", unloading and reloading of the driver results in the following error during ifup: | irq: type mismatch, failed to map hwirq-31 for gpio@20a8000! | tcan4x5x spi1.1: m_can device registered (irq=0, version=32) | tcan4x5x spi1.1 can2: TCAN4X5X successfully initialized. | tcan4x5x spi1.1 can2: failed to request interrupt This patch fixes the problem by removing the IRQF_TRIGGER_FALLING from the request_threaded_irq(). Fixes:f524f829b7("can: m_can: Create a m_can platform framework") Cc: Dan Murphy <dmurphy@ti.com> Cc: Sriram Dash <sriram.dash@samsung.com> Cc: Pankaj Sharma <pankj.sharma@samsung.com> Link: https://lore.kernel.org/r/20201127093548.509253-1-mkl@pengutronix.de Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de> Signed-off-by: Sasha Levin <sashal@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.