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Date: Sun, 22 Apr 2012 14:17:55 -0400 From: "jonsmirl@...il.com" <jonsmirl@...il.com> To: lkml <linux-kernel@...r.kernel.org>, ARM Linux Mailing List <linux-arm-kernel@...ts.infradead.org> Subject: irqdomains and irq_domain_add_linear On ARM with the current Linus tree the irqdomain code doesn't work if you have multiple linear domains. In my case I have two interrupt controllers. As the device tree is parsed interrupts get randomly assigned from each of the two domains. These IRQs get assigned sequentially ascending VIRQ numbers and sequentially ascending descriptors. But then when an interrupt happens, the ARM interrupt handler looks the interrupt up in the descriptor array. This array is based on virq, not hwirq. As soon as the 1:1 relationship of virq to hwirq is broken (it got broken by alternating assignments to the interrupt controllers) the descriptor lookup stops working since it retrieves the wrong descriptor. In my case it made the console fail making it difficult to debug what was happening. I reverted back to irq_domain_add_legacy() which keeps the 1:1 mapping and everything started working again. My initial through to fix this was to add a revmap look up in the interrupt handler. But a better way might be to keep the descriptor array corresponding to hwirq instead of virq. -- Jon Smirl jonsmirl@...il.com -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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