Re: [Adeos-main] [RTnet-users] e1000 & MSI

[Jan Kiszka <jan.kiszka@domain.hid>]

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Philippe Gerum wrote:
> bernhard@domain.hid wrote:
>>>> Found it. Could you give this patch a try and report the result?
>>>>
>>>> http://permalink.gmane.org/gmane.linux.kernel/682362
>> Applied and tested, no luck...
>>
>> I-pipe: Detected illicit call from domain 'RTAI'
>>          into a service reserved for domain 'Linux' and below.
>> Pid: 0, comm: swapper Not tainted 2.6.26.2-FuCS #1
>>   [<c0156866>] ipipe_check_context+0xd6/0xf0
>> e1000: rteth0: e1000_watchdog: NIC Link is Up 1000 Mbps Full Duplex
>>   [<c03e206e>] _spin_lock_irqsave+0x1e/0x80
>>   [<c024a7a6>] pci_bus_read_config_word+0x36/0x80
>>   [<c0254156>] __msi_set_enable+0x46/0x80
>>   [<c01176f3>] ? mcount+0x1f/0x23
>>   [<c0254498>] msi_set_mask_bits+0xd8/0xe0
>>   [<c01176f3>] ? mcount+0x1f/0x23
>>   [<c0254737>] unmask_msi_irq+0x17/0x30
>>   [<c01542da>] default_enable+0x1a/0x30
>>   [<f892f1ee>] rt_enable_irq+0xe/0x10 [rtai_hal]
>>   [<f8dabd99>] ? xnintr_irq_handler+0x149/0x1f0 [rtai_rtdm]
>>   [<f893164b>] rtai_hirq_dispatcher+0xfb/0x430 [rtai_hal]
>>   [<c01021c5>] default_idle+0x45/0x60
>>   [<c0102180>] default_idle+0x0/0x60
>>   [<c0103cc7>] common_interrupt+0x2f/0x54
>>   [<c0102180>] default_idle+0x0/0x60
>>   [<c01500d8>] cgroup_file_write+0x118/0x140
>>   [<c01021c5>] default_idle+0x45/0x60
>>   [<c0101b76>] cpu_idle+0x86/0x140
>>   [<c03dd7fd>] start_secondary+0x16d/0x210
>>   [<c03d3a88>] initialize_secondary+0x8/0x20
>>   =======================
>> I-pipe tracer log (100 points):
>>   |  +*func                    0 ipipe_trace_panic_freeze+0x9  
> 
> I see no option aside of ironing the inner code that reads/writes the PCI
> config, so here is an ugly yet possible solution for x86, that might work
> (totally untested):

Very ugly. There is potentially some heavy code under this lock. 
Wouldn't it be better to switch to soft-disabling directly, also given 
that not all devices will support that method anyway?

Jan


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