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of_irq_to_resource() currently uses irq_of_parse_and_map() to translate a DT interrupt specification into a Linux virtual interrupt number. While this works in most cases, irq_of_parse_and_map() doesn't properly handle the case where the interrupt controller is not yet available (due to deferred probing for example). So instead, use of_irq_get(), which is implemented exactly like irq_of_parse_and_map(), with the exception that if the interrupt controller is not yet available, it returns -EPROBE_DEFER. Obviously, we also handle this error and bail out from of_irq_to_resource() when of_irq_get() returns an error. This allows to avoid silly error messages at boot time caused by irq_create_of_mapping() when the interrupt controller is not available: [ 0.153168] irq: no irq domain found for /ap806/config-space@f0000000/interrupt-controller@3f0100 ! [ 0.154041] irq: no irq domain found for /cp110-master/config-space@f2000000/interrupt-controller@1e0000 ! [ 0.154124] irq: no irq domain found for /cp110-master/config-space@f2000000/interrupt-controller@1e0000 ! [ 0.154207] irq: no irq domain found for /cp110-master/config-space@f2000000/interrupt-controller@1e0000 ! [ 0.154437] irq: no irq domain found for /cp110-master/config-space@f2000000/interrupt-controller@1e0000 ! [ 0.154518] irq: no irq domain found for /cp110-master/config-space@f2000000/interrupt-controller@1e0000 ! Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com> Signed-off-by: Rob Herring <robh@kernel.org>
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.