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9a2239b117
rmmod/3080 [HC0[0]:SC0[0]:HE0:SE1] is trying to acquire:
(proc_subdir_lock){--..}, at: [<c04a33b0>] remove_proc_entry+0x40/0x191
and this task is already holding:
(ide_lock){++..}, at: [<c05651a2>] ide_unregister_subdriver+0x39/0xc8
which would create a new lock dependency:
(ide_lock){++..} -> (proc_subdir_lock){--..}
but this new dependency connects a hard-irq-safe lock:
(ide_lock){++..}
... which became hard-irq-safe at:
[<c043c458>] lock_acquire+0x4b/0x6b
[<c06129d7>] _spin_lock_irqsave+0x22/0x32
[<c0567870>] ide_intr+0x17/0x1a9
[<c044eb31>] handle_IRQ_event+0x20/0x4d
[<c044ebf2>] __do_IRQ+0x94/0xef
[<c0406771>] do_IRQ+0x9e/0xbd
to a hard-irq-unsafe lock:
(proc_subdir_lock){--..}
... which became hard-irq-unsafe at:
... [<c043c458>] lock_acquire+0x4b/0x6b
[<c06126ab>] _spin_lock+0x19/0x28
[<c04a32f2>] xlate_proc_name+0x1b/0x99
[<c04a3547>] proc_create+0x46/0xdf
[<c04a3642>] create_proc_entry+0x62/0xa5
[<c07c1972>] proc_misc_init+0x1c/0x1d2
[<c07c1844>] proc_root_init+0x4c/0xe9
[<c07ad703>] start_kernel+0x294/0x3b3
Move ide_remove_proc_entries() out from under ide_lock; there is nothing
that indicates that this is needed.
In specific, the call to ide_add_proc_entries() is unprotected, and there
is nothing else in the file using the respective ->proc fields. Also the
lock order around destroy_proc_ide_interface() suggests this.
Alan sayeth:
proc_ide_write_settings walks the setting list under ide_setting_sem, read
ditto. remove_proc_entry is doing proc side housekeeping.
Looks fine to me, although that old code is such a mess anything could be
going on.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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