linux-kernel - [2.6.22] edac: sleeping function called from invalid context

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Message-ID: <20070714230154.GA22439@dreamland.darkstar.lan>
Date:	Sun, 15 Jul 2007 01:01:54 +0200
From:	Luca Tettamanti <kronos.it@...il.com>
To:	Doug Thompson <norsk5@...ssion.com>
Cc:	linux-kernel@...r.kernel.org, bluesmoke-devel@...ts.sourceforge.net
Subject: [2.6.22] edac: sleeping function called from invalid context

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 
 anelli di Saturno sarebbero interamente composti dai bagagli andati 
 persi nei viaggi aerei." -- Mark Russel
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