[haiku-bugs] Re: [Haiku] #8939: USB Mouse pauses erratically
- From: "ithamar" <trac@xxxxxxxxxxxx>
- Date: Mon, 16 Mar 2015 13:14:15 -0000
#8939: USB Mouse pauses erratically
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Reporter: jessicah | Owner: ithamar
Type: bug | Status: assigned
Priority: normal | Milestone: R1
Component: Drivers/Mouse/USB | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Blocking: 8685
Has a Patch: 0 | Platform: All
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Changes (by ithamar):
* owner: mmlr => ithamar
* status: new => assigned
Comment:
I have a patch in testing here that I suspect will solve this problem.
When the interrupt pipe stalls, it does a clear_feature() from the
callback, which causes a synchronous transfer, which is not allowed from
the callback (since the callback executes in the finish thread). Once that
happens, the usb stack gets seriously confused, causing the "usb error hub
XXX: error updating port status" messaging from the Explore thread.
Sometimes the stack recovers, sometimes it doesn't, very much dependent on
"undefined" controller behavior, and other bus activity at the time.
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Ticket URL: <https://dev.haiku-os.org/ticket/8939#comment:17>
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