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Message #06019
[Bug 855199] Re: "irqfixup" and "irqpoll" broken since 2.6.39
Here are examples of more distros encountering the problem:
http://fedoraforum.org/forum/showthread.php?p=1527448
https://bbs.archlinux.org/viewtopic.php?pid=1014552
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https://bugs.launchpad.net/bugs/855199
Title:
"irqfixup" and "irqpoll" broken since 2.6.39
Status in The Linux Kernel:
Confirmed
Status in Mythbuntu, Ubuntu derivative focused upon MythTV:
Confirmed
Status in “linux” package in Ubuntu:
Triaged
Bug description:
In all kernels since 2.6.39, the "irqfixup" and "irqpoll" options are
no longer taking effect. I have several machines that need to boot
with one of these options, and I see reports of this regression from
multiple other users.
The interrupts now generate the same errors seen without these kernel
options, e.g.:
irq 19: nobody cared (try booting with the "irqpoll" option)
even though irqpoll, or irqfixup, is used.
The Linux irq code was reworked during the 2.6.39 cycle. I have gone
through the patches, and this is the commit where the regression
arrives:
commit d05c65fff0
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commit;h=d05c65fff0ef672be75429266751f0e015b54d94
I have a patch that fixes most of my machones, and the maintainer has
accepted it:
https://lkml.org/lkml/2011/11/2/260
Any testing of the current patch would be great.
I wish I could say that's the end of it, but I have found
configurations on my machines where a bad irq still goes uncaught,
even with my patch.
Focusing on those cases, it comes down to this patch:
commit fa27271bc , genirq: Fixup poll handling
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux.git;a=commitdiff;h=fa27271bc8d230355c1f24ddea103824fdc12de6
This patch changes the approach in multiple ways, and I haven't
figured out where it drops the ball. I've toyed around with the
changes, but have not produced a clear fix. I'll keep trying, and
will be in touch with the maintainer again.
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