Hi,
as soon as I enable parity check on PCI bus (with polling - EDAC_POLL),
the following warning is triggered:
EDAC MC: Ver: 2.0.1 Jul 13 2007
BUG: sleeping function called from invalid context at /home/kronos/src/linux-2.6.git/kernel/rwsem.c:20
in_atomic():0, irqs_disabled():1
INFO: lockdep is turned off.
irq event stamp: 0
hardirqs last enabled at (0): [<00000000>] 0x0
hardirqs last disabled at (0): [<c0120063>] copy_process+0x363/0x11e8
softirqs last enabled at (0): [<c0120063>] copy_process+0x363/0x11e8
softirqs last disabled at (0): [<00000000>] 0x0
[<c0134fb2>] down_read+0x15/0x49
[<c02f4669>] schedule_timeout+0x79/0x8d
[<c01deef0>] pci_get_subsys+0x68/0xea
[<c01298a4>] process_timeout+0x0/0x5
[<c01def88>] pci_get_device+0x16/0x19
[<fa4b98cd>] edac_kernel_thread+0x94/0x10c [edac_mc]
[<fa4b9839>] edac_kernel_thread+0x0/0x10c [edac_mc]
[<c0132264>] kthread+0x38/0x60
[<c013222c>] kthread+0x0/0x60
[<c0104ae7>] kernel_thread_helper+0x7/0x10
=======================
The warning is caused by the fact that do_pci_parity_check() calls
edac_pci_dev_parity_iterator() with interrupts disabled and
pci_get_device acquires pci_bus_sem (via pci_get_subsys).
Luca
--
"La mia teoria scientifica preferita e` quella secondo la quale gli
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