[haiku-bugs] Re: [Haiku] #6041: Haiku hangs on boot with wireless keyboard+mouse
- From: "mmlr" <trac@xxxxxxxxxxxx>
- Date: Tue, 21 Jun 2011 09:39:40 -0000
#6041: Haiku hangs on boot with wireless keyboard+mouse
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Reporter: franxico | Owner: mmlr
Type: bug | Status: new
Priority: normal | Milestone: R1
Component: Drivers/USB | Version: R1/alpha2
Resolution: | Keywords:
Blocked By: | Blocking: 7665
Has a Patch: 0 | Platform: x86
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Comment (by mmlr):
Please attach photos individually in the future, resizing them so that
they are < 500k if possible. This makes it possible to look at them
directly from trac and greatly increases the likelihood of someone looking
at them.
In this case, what happens seems to be a lot of unhandled interrupts on
UHCI startup, leading to IRQ 19 being disabled. That one is shared between
the SATA, IDE and two UHCI controllers. The disable happens before all
UHCI controllers are fully initialized which probably explains why the
interrupt is disabled, as the controller driver that would handle them
isn't yet installed. Since we don't yet re-enable an IRQ when a new
handler is installed, the disabled IRQ sticks and probably causes the SATA
or IDE controller to fail later on, stalling the boot process.
It's difficult to handle differently. A possibility would be to scan the
USB controllers first, initializing them only to the point where the
interrupts can be masked, do that for all controllers and only do the full
initialization in a second step. The other way (and this one will have to
be implemented anyway) is to just re-enable a disabled IRQ whenever a new
handler is installed. This still has the problem that there will be an
interrupt storm early on (until the IRQ is disabled eventually) which'll
introduce needless delays.
--
Ticket URL: <http://dev.haiku-os.org/ticket/6041#comment:5>
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