Messages in this thread | | | Date | Tue, 10 Apr 2012 10:50:14 +0200 | Subject | Re: i915_driver_irq_handler: irq 42: nobody cared [generic IRQ handling broken?] | From | Daniel Vetter <> |
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On Fri, Apr 6, 2012 at 23:31, Jiri Slaby <jslaby@suse.cz> wrote: >> That was introduced in 05eff845a28499762075d3a72e238a31f4d2407c to close >> a race where the pipestat triggered an interrupt after we processed the >> secondary registers and before reseting the primary. >> >> But the basic premise that we should only enter the interrupt handler >> with IIR!=0 holds (presuming non-shared interrupt lines such as MSI). > > Ok, this behavior is definitely new. I get several "nobody cared" about > this interrupt a week. This never used to happen. And something weird > emerges in /proc/interrupts when this happens: > 42: 1003292 1212890 PCI-MSI-edge �s����:0000:00:02.0 > instead of > 42: 1006715 1218472 PCI-MSI-edge i915@pci:0000:00:02.0
This looks ugly. Can you try to reproduce on 3.4-rc2? That should contain everything that -next currently contains drm/i915-wise. If it still happens there, please bisect it.
Also please check whether any of the subordinate interrupt regs (pipestat) is stuck and might cause these interrupts as Jesse suggested.
Thanks, Daniel -- Daniel Vetter daniel.vetter@ffwll.ch - +41 (0) 79 364 57 48 - http://blog.ffwll.ch -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.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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