Lee Revell wrote:
On Sat, 2006-02-11 at 01:31 +0100, Stefan Richter wrote:
Andrew Morton wrote:
That's a -mm-only warning telling you that get_phy_reg() is doing a
one-millisecond-or-more busywait while local interrupts are disabled.
Same with set_phy_reg, ohci_soft_reset, ohci_hw_csr_reg.
[...]
In fact I'm pretty sure we have seen reports on the linux-audio-user
list of apps reporting underruns when a 1394 drive is accessed.
These might have different causes. The 1394 storage driver, sbp2,
performs quite a lot of protocol handling in IRQ or soft IRQ context. I
have been planning to move this off into process context -- not really
because of potential latency issues but for sake of more reliable
protocol handling. I hope I get to it RSN.
AFAICS the offending ohci1394 functions mentioned above are never called
during normal access to an SBP-2 device. They only happen when a host
adapter is initialized or shut down or whenever a 1394 device is plugged
in or out (actually whenever self ID reception is completed).
--
Stefan Richter
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http://arcgraph.de/sr/
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