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30b4e122d7
Without this test, sir_ir clumsy claims resources for a device which does not exist. The 0-day kernel test robot reports the following errors (in a loop): sir_ir sir_ir.0: Trapped in interrupt genirq: Flags mismatch irq 4. 00000000 (ttyS0) vs. 00000000 (sir_ir) When sir_ir is loaded with the default io and irq, the following happens: - sir_ir claims irq 4 - user space opens /dev/ttyS0 - in serial8250_do_startup(), some setup is done for ttyS0, which causes irq 4 to fire (in THRE test) - sir_ir does not realise it was not for it, and spins until the "trapped in interrupt" - now serial driver calls setup_irq() and fails and we get the "Flags mismatch" error. There is no port present at 0x3e8 so simply check for the presence of a port, as suggested by Linus. Reported-by: kbuild test robot <fengguang.wu@intel.com> Tested-by: Fengguang Wu <fengguang.wu@intel.com> Signed-off-by: Sean Young <sean@mess.org> Cc: <stable@vger.kernel.org> # 4.12+ Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> |
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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.