Re: 2.6.17-rc6-mm1 -- BUG: warning at drivers/ieee1394/ohci1394.c:235/get_phy_reg()

[Stefan Richter <stefanr@s5r6.in-berlin.de>]

Miles Lane wrote at lkml:
> BUG: warning at drivers/ieee1394/ohci1394.c:235/get_phy_reg()
> [<c0103999>] show_trace_log_lvl+0x53/0xff
> [<c0103ff1>] show_trace+0x16/0x19
> [<c0104037>] dump_stack+0x1a/0x1f
> [<f9295ade>] get_phy_reg+0x77/0xe4 [ohci1394]
> [<f9295e66>] ohci_devctl+0x49/0x56c [ohci1394]
> [<f9298e82>] ohci_irq_handler+0x329/0x720 [ohci1394]
> [<c01435cd>] handle_IRQ_event+0x18/0x4d
> [<c01443fb>] handle_fasteoi_irq+0x57/0x95
> [<c01050bf>] do_IRQ+0xa1/0xc6
> [<c0103475>] common_interrupt+0x25/0x2c
> BUG: warning at drivers/ieee1394/ohci1394.c:264/set_phy_reg()
> [<c0103999>] show_trace_log_lvl+0x53/0xff
> [<c0103ff1>] show_trace+0x16/0x19
> [<c0104037>] dump_stack+0x1a/0x1f
> [<f9295a14>] set_phy_reg+0x84/0xd7 [ohci1394]
> [<f9295e79>] ohci_devctl+0x5c/0x56c [ohci1394]
> [<f9298e82>] ohci_irq_handler+0x329/0x720 [ohci1394]
> [<c01435cd>] handle_IRQ_event+0x18/0x4d
> [<c01443fb>] handle_fasteoi_irq+0x57/0x95
> [<c01050bf>] do_IRQ+0xa1/0xc6
> [<c0103475>] common_interrupt+0x25/0x2c

Above trace seems to appear due to a hack to get certain FireWire 
controllers going: Apple UniNorth, NVidia nForce2. Miles, do you have 
one of those?

A similar trace occurs as ohci_irq_handler -> hpsb_selfid_complete
-> highlevel_host_reset -> csr.c::host_reset -> {ohci_}hw_csr_reg -> 
mdelay. This host_rest's purpose is to mark iso channel 31 as default 
broadcast channel. This functionality can probably be moved into a 
workqueue job or into nodemgr's kthread. This is currently being tracked 
as http://bugzilla.kernel.org/show_bug.cgi?id=6070 but I am afraid 
nobody is actively working on it yet.
--
Stefan Richter
-=====-=-==- -==- -=-=-
http://arcgraph.de/sr/
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