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linux/drivers/usb/storage
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Ming Lei c825bab0ce usb: storage: fix lockdep warning inside usb_stor_pre_reset(v2) 
This patch fixes one lockdep warning[1] inside usb_stor_pre_reset.

If the current configuration includes multiple mass storage interfaces,
the 'AA' lockdep warning will be triggered since the lock class of
'us->dev_mutex' is acquired two times in .reset path. It isn't
a real deadlock, so just take the lockdep_set_class annotation to
remove the warning.

[1], lockdep warning log
:[ INFO: possible recursive locking detected ]
:3.3.0-0.rc5.git3.1.fc17.x86_64 #1 Tainted: G        W
:---------------------------------------------
:usb-storage/14846 is trying to acquire lock:
: (&(us->dev_mutex)){+.+.+.}, at: [<ffffffffa0481c0c>] usb_stor_pre_reset+0x1c/0x20 [usb_storage]
:but task is already holding lock:
: (&(us->dev_mutex)){+.+.+.}, at: [<ffffffffa0481c0c>] usb_stor_pre_reset+0x1c/0x20 [usb_storage]
:other info that might help us debug this:
: Possible unsafe locking scenario:
:       CPU0
:       ----
:  lock(&(us->dev_mutex));
:  lock(&(us->dev_mutex));
: *** DEADLOCK ***
: May be due to missing lock nesting notation
:2 locks held by usb-storage/14846:
: #0:  (&__lockdep_no_validate__){......}, at: [<ffffffff8147e6a5>] usb_lock_device_for_reset+0x95/0x100
: #1:  (&(us->dev_mutex)){+.+.+.}, at: [<ffffffffa0481c0c>] usb_stor_pre_reset+0x1c/0x20 [usb_storage]
:stack backtrace:
:Pid: 14846, comm: usb-storage Tainted: G        W 3.3.0-0.rc5.git3.1.fc17.x86_64 #1
:Call Trace:
: [<ffffffff810cbdaf>] __lock_acquire+0x168f/0x1bb0
: [<ffffffff81021083>] ? native_sched_clock+0x13/0x80
: [<ffffffff810210f9>] ? sched_clock+0x9/0x10
: [<ffffffff810210f9>] ? sched_clock+0x9/0x10
: [<ffffffff810a2975>] ? sched_clock_local+0x25/0xa0
: [<ffffffff810cc9a1>] lock_acquire+0xa1/0x1e0
: [<ffffffffa0481c0c>] ? usb_stor_pre_reset+0x1c/0x20 [usb_storage]
: [<ffffffff81699c86>] mutex_lock_nested+0x76/0x3a0
: [<ffffffffa0481c0c>] ? usb_stor_pre_reset+0x1c/0x20 [usb_storage]
: [<ffffffffa0481c0c>] ? usb_stor_pre_reset+0x1c/0x20 [usb_storage]
: [<ffffffffa0481c0c>] usb_stor_pre_reset+0x1c/0x20 [usb_storage]
: [<ffffffff8148184d>] usb_reset_device+0x7d/0x190
: [<ffffffffa048119c>] usb_stor_port_reset+0x7c/0x80 [usb_storage]
: [<ffffffffa0481234>] usb_stor_invoke_transport+0x94/0x560 [usb_storage]
: [<ffffffff810cd3b2>] ? mark_held_locks+0xb2/0x130
: [<ffffffff8169dbd0>] ? _raw_spin_unlock_irq+0x30/0x50
: [<ffffffffa047fe3e>] usb_stor_transparent_scsi_command+0xe/0x10 [usb_storage]
: [<ffffffffa0481ae3>] usb_stor_control_thread+0x173/0x280 [usb_storage]
: [<ffffffffa0481970>] ? fill_inquiry_response+0x20/0x20 [usb_storage]
: [<ffffffff8108a3f7>] kthread+0xb7/0xc0
: [<ffffffff816a7d34>] kernel_thread_helper+0x4/0x10
: [<ffffffff8169e0f4>] ? retint_restore_args+0x13/0x13
: [<ffffffff8108a340>] ? kthread_worker_fn+0x1a0/0x1a0
: [<ffffffff816a7d30>] ? gs_change+0x13/0x13

Reported-By: Dave Jones <davej@redhat.com>
Signed-off-by: Ming Lei <tom.leiming@gmail.com>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2012-04-06 13:54:00 -07:00
..
Kconfig Documentation: remove references to /etc/modprobe.conf 2012-03-30 16:03:15 -07:00
Makefile
…
alauda.c usb: Disable dynamic id of USB storage subdrivers 2012-01-24 14:31:03 -08:00
cypress_atacb.c usb: Disable dynamic id of USB storage subdrivers 2012-01-24 14:31:03 -08:00
datafab.c usb: Disable dynamic id of USB storage subdrivers 2012-01-24 14:31:03 -08:00
debug.c
…
debug.h
…
ene_ub6250.c usb/storage: redefine US_BULK_FLAG_IN and use it 2012-02-28 11:07:42 -08:00
freecom.c usb: Disable dynamic id of USB storage subdrivers 2012-01-24 14:31:03 -08:00
initializers.c
…
initializers.h
…
isd200.c usb: Disable dynamic id of USB storage subdrivers 2012-01-24 14:31:03 -08:00
jumpshot.c usb: Disable dynamic id of USB storage subdrivers 2012-01-24 14:31:03 -08:00
karma.c usb: Disable dynamic id of USB storage subdrivers 2012-01-24 14:31:03 -08:00
libusual.c
…
onetouch.c usb: Disable dynamic id of USB storage subdrivers 2012-01-24 14:31:03 -08:00
option_ms.c usb: Add module.h to drivers/usb consumers who really use it. 2011-10-31 19:31:25 -04:00
option_ms.h
…
protocol.c usb-storage: Accept 8020i-protocol commands longer than 12 bytes 2011-11-14 17:05:03 -08:00
protocol.h
…
realtek_cr.c usb/storage: redefine US_BULK_FLAG_IN and use it 2012-02-28 11:07:42 -08:00
scsiglue.c usb-storage: reorganize target-specific code 2012-02-08 17:36:41 -08:00
scsiglue.h
…
sddr09.c usb: Disable dynamic id of USB storage subdrivers 2012-01-24 14:31:03 -08:00
sddr55.c usb: Disable dynamic id of USB storage subdrivers 2012-01-24 14:31:03 -08:00
shuttle_usbat.c usb: Disable dynamic id of USB storage subdrivers 2012-01-24 14:31:03 -08:00
sierra_ms.c usb: Add module.h to drivers/usb consumers who really use it. 2011-10-31 19:31:25 -04:00
sierra_ms.h
…
transport.c usb/storage: redefine US_BULK_FLAG_IN and use it 2012-02-28 11:07:42 -08:00
transport.h usb/storage: a couple defines from drivers/usb/storage/transport.h to include/linux/usb/storage.h 2012-02-28 11:05:18 -08:00
uas.c usb/uas: make sure data urb is gone if we receive status before that 2012-02-02 14:51:30 -08:00
unusual_alauda.h
…
unusual_cypress.h
…
unusual_datafab.h
…
unusual_devs.h Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial 2012-01-08 13:21:22 -08:00
unusual_ene_ub6250.h
…
unusual_freecom.h
…
unusual_isd200.h
…
unusual_jumpshot.h
…
unusual_karma.h
…
unusual_onetouch.h
…
unusual_realtek.h
…
unusual_sddr09.h
…
unusual_sddr55.h
…
unusual_usbat.h
…
usb.c usb: storage: fix lockdep warning inside usb_stor_pre_reset(v2) 2012-04-06 13:54:00 -07:00
usb.h usb-storage: fix freezing of the scanning thread 2012-02-21 16:29:15 -08:00
usual-tables.c
…