linux-kernel - usb+sysfs: duplicate filename 'bInterfaceNumber'

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Message-ID: <20071014151538.GA9539@gollum.tnic>
Date:	Sun, 14 Oct 2007 17:15:38 +0200
From:	Borislav Petkov <bbpetkov@...oo.de>
To:	linux-kernel@...r.kernel.org,
	linux-usb-devel@...ts.sourceforge.net, Greg KH <greg@...ah.com>
Subject: usb+sysfs: duplicate filename 'bInterfaceNumber'

Hi,

i get the following warning on yesterday's git tree (v2.6.23-2840-g752097c):

Oct 14 09:07:15 zmei kernel: [   49.368030] sysfs: duplicate filename 'bInterfaceNumber' can not be created
Oct 14 09:07:15 zmei kernel: [   49.368086] WARNING: at fs/sysfs/dir.c:425 sysfs_add_one()
Oct 14 09:07:15 zmei kernel: [   49.368134]  [<c010527c>] show_trace_log_lvl+0x1a/0x2f
Oct 14 09:07:15 zmei kernel: [   49.368220]  [<c0105da0>] show_trace+0x12/0x14
Oct 14 09:07:15 zmei kernel: [   49.368300]  [<c0105db8>] dump_stack+0x16/0x18
Oct 14 09:07:15 zmei kernel: [   49.368379]  [<c019f2ee>] sysfs_add_one+0x57/0xbc
Oct 14 09:07:15 zmei kernel: [   49.368461]  [<c019edeb>] sysfs_add_file+0x49/0x71
Oct 14 09:07:15 zmei kernel: [   49.368541]  [<c01a05c2>] sysfs_create_group+0x86/0xe8
Oct 14 09:07:15 zmei kernel: [   49.368621]  [<c024f5da>] usb_create_sysfs_intf_files+0x27/0x9b
Oct 14 09:07:15 zmei kernel: [   49.368704]  [<c024c28b>] usb_set_configuration+0x454/0x466
Oct 14 09:07:15 zmei kernel: [   49.368787]  [<c0252b97>] generic_probe+0x53/0x94
Oct 14 09:07:15 zmei kernel: [   49.368867]  [<c024d4f7>] usb_probe_device+0x35/0x3b
Oct 14 09:07:15 zmei kernel: [   49.368947]  [<c022a46c>] driver_probe_device+0xcb/0x14f
Oct 14 09:07:15 zmei kernel: [   49.369039]  [<c022a4f8>] __device_attach+0x8/0xa
Oct 14 09:07:15 zmei kernel: [   49.369119]  [<c02298d5>] bus_for_each_drv+0x3b/0x63
Oct 14 09:07:15 zmei kernel: [   49.369199]  [<c022a589>] device_attach+0x70/0x85
Oct 14 09:07:15 zmei kernel: [   49.369279]  [<c022984c>] bus_attach_device+0x29/0x77
Oct 14 09:07:15 zmei kernel: [   49.369359]  [<c0228abc>] device_add+0x28c/0x445
Oct 14 09:07:15 zmei kernel: [   49.369439]  [<c0247c7a>] usb_new_device+0x44/0x82
Oct 14 09:07:15 zmei kernel: [   49.369519]  [<c02486ec>] hub_thread+0x666/0x9c2
Oct 14 09:07:15 zmei kernel: [   49.369598]  [<c01370e9>] kthread+0x3b/0x62
Oct 14 09:07:15 zmei kernel: [   49.369679]  [<c0104eaf>] kernel_thread_helper+0x7/0x10
Oct 14 09:07:15 zmei kernel: [   49.369759]  =======================

The usb hub in question is named 4-1:1.0 and it has an extension connected to it
which is used to activate the 2 usb connectors at the side of the pc's monitor.
Correct me if i'm wrong but from what i've understood so far from reading the code,
i think, it adds the bInterfaceNumber-file after calling usb_create_sysfs_intf_files(intf).
However, the currently active usbhost interface alternate setting is the only one active
so the bInterfaceNumber exists already and therefore the warning, but this is
just a guess since i'm not that fluent in the usb internals.

.config attached.

-- 
Regards/Gruß,
    Boris.

View attachment "config-2.6.23-2840-g752097c" of type "text/plain" (44647 bytes)