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    Subjectbluetooth: hci_sysfs work queue problem
    Hi,
    The hci_sysfs uses work queue to finish the sysfs add/del fuction.
    But when the same device connection failed, if another connection of
    same device come in before the delete work finish, sysfs will warn
    about duplicate filename creating.

    Sep 19 12:30:27 darkstar kernel: sysfs: duplicate filename
    'acl00194FDB6C71' can not be created
    Sep 19 12:30:27 darkstar kernel: WARNING: at fs/sysfs/dir.c:433 sysfs_add_one()
    Sep 19 12:30:27 darkstar kernel: [<c01c3ad0>] sysfs_add_one+0xa0/0xe0
    Sep 19 12:30:27 darkstar kernel: [<c01c3e38>] create_dir+0x48/0xb0
    Sep 19 12:30:27 darkstar kernel: [<c0178df5>] __slab_alloc+0x205/0x250
    Sep 19 12:30:27 darkstar kernel: [<c01c3ee9>] sysfs_create_dir+0x29/0x50
    Sep 19 12:30:27 darkstar kernel: [<c024cf5b>] create_dir+0x1b/0x50
    Sep 19 12:30:27 darkstar kernel: [<c024d226>] kobject_add+0x46/0x150
    Sep 19 12:30:27 darkstar kernel: [<c024d404>] kobject_set_name+0x84/0xf0
    Sep 19 12:30:27 darkstar kernel: [<c02b7035>] device_add+0x95/0x350
    Sep 19 12:30:27 darkstar kernel: [<f88aec60>] add_conn+0x0/0x90 [bluetooth]
    Sep 19 12:30:27 darkstar kernel: [<f88aec6f>] add_conn+0xf/0x90 [bluetooth]
    Sep 19 12:30:27 darkstar kernel: [<c01663d0>] vmstat_update+0x0/0x30
    Sep 19 12:30:27 darkstar kernel: [<c013bdfe>] run_workqueue+0x5e/0x110
    Sep 19 12:30:27 darkstar kernel: [<c013bf5c>] worker_thread+0xac/0x100
    Sep 19 12:30:27 darkstar kernel: [<c0140340>] autoremove_wake_function+0x0/0x50
    Sep 19 12:30:27 darkstar kernel: [<c0140340>] autoremove_wake_function+0x0/0x50
    Sep 19 12:30:27 darkstar kernel: [<c013beb0>] worker_thread+0x0/0x100
    Sep 19 12:30:27 darkstar kernel: [<c013fd49>] kthread+0x59/0xa0
    Sep 19 12:30:27 darkstar kernel: [<c013fcf0>] kthread+0x0/0xa0
    Sep 19 12:30:27 darkstar kernel: [<c0104fb3>] kernel_thread_helper+0x7/0x14
    Sep 19 12:30:27 darkstar kernel: =======================
    Sep 19 12:30:27 darkstar kernel: kobject_add failed for
    acl00194FDB6C71 with -EEXIST, don't try to register things with the
    same name in the same directory.
    Sep 19 12:30:27 darkstar kernel: [<c024d2d6>] kobject_add+0xf6/0x150
    Sep 19 12:30:27 darkstar kernel: [<c02b7035>] device_add+0x95/0x350
    Sep 19 12:30:27 darkstar kernel: [<f88aec60>] add_conn+0x0/0x90 [bluetooth]
    Sep 19 12:30:27 darkstar kernel: [<f88aec6f>] add_conn+0xf/0x90 [bluetooth]
    Sep 19 12:30:27 darkstar kernel: [<c01663d0>] vmstat_update+0x0/0x30
    Sep 19 12:30:27 darkstar kernel: [<c013bdfe>] run_workqueue+0x5e/0x110
    Sep 19 12:30:27 darkstar kernel: [<c013bf5c>] worker_thread+0xac/0x100
    Sep 19 12:30:27 darkstar kernel: [<c0140340>] autoremove_wake_function+0x0/0x50
    Sep 19 12:30:27 darkstar kernel: [<c0140340>] autoremove_wake_function+0x0/0x50
    Sep 19 12:30:27 darkstar kernel: [<c013beb0>] worker_thread+0x0/0x100
    Sep 19 12:30:27 darkstar kernel: [<c013fd49>] kthread+0x59/0xa0
    Sep 19 12:30:27 darkstar kernel: [<c013fcf0>] kthread+0x0/0xa0
    Sep 19 12:30:27 darkstar kernel: [<c0104fb3>] kernel_thread_helper+0x7/0x14
    Sep 19 12:30:27 darkstar kernel: =======================
    Sep 19 12:30:27 darkstar kernel: add_conn: Failed to register connection device
    Sep 19 12:41:36 darkstar kernel: [<c0104fb3>] kernel_thread_helper+0x7/0x14

    Marcel, how to resolve this problem? do you have some ideas?

    Regards
    dave
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