path: root/Documentation/devicetree
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authorThomas Gleixner <tglx@linutronix.de>2017-05-23 23:23:32 +0200
committerLinus Walleij <linus.walleij@linaro.org>2017-06-09 10:51:54 +0200
commitba714a9c1dea85e0bf2899d02dfeb9c70040427c (patch)
tree5088269acaa754db8659f7e6d91cf71ea47a9c77 /Documentation/devicetree
parent3c2993b8c6143d8a5793746a54eba8f86f95240f (diff)
pinctrl/amd: Use regular interrupt instead of chained
The AMD pinctrl driver uses a chained interrupt to demultiplex the GPIO interrupts. Kevin Vandeventer reported, that his new AMD Ryzen locks up hard on boot when the AMD pinctrl driver is initialized. The reason is an interrupt storm. It's not clear whether that's caused by hardware or firmware or both. Using chained interrupts on X86 is a dangerous endavour. If a system is misconfigured or the hardware buggy there is no safety net to catch an interrupt storm. Convert the driver to use a regular interrupt for the demultiplex handler. This allows the interrupt storm detector to catch the malfunction and lets the system boot up. This should be backported to stable because it's likely that more users run into this problem as the AMD Ryzen machines are spreading. Reported-by: Kevin Vandeventer Link: https://bugzilla.suse.com/show_bug.cgi?id=1034261 Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
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