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From: Ming Lei on 28 Jul 2010 03:00
Hi,

'Unknown symbol in module' happens after the actions below:

rmmod ehci-hcd
modprobe ehci-hcd

kernel version: 2.6.35-rc6+gregkh tree+wireless tree

dmsg info:
[ 689.025428] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 689.025431] Warning! ehci_hcd should always be loaded before
uhci_hcd and ohci_hcd, not after
[ 689.025434] ehci_hcd: block sizes: qh 104 qtd 96 itd 192 sitd 96

From source code of ehci-hcd, seems debugfs_create_dir or usb_debug_root
in ehci_hcd_init is thought as unknown symbol mistakenly by kernel.

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Lei Ming
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From: Ming Lei on 28 Jul 2010 03:40
2010/7/28 Ming Lei <tom.leiming(a)gmail.com>:
> Hi,
>
> 'Unknown symbol in module' �happens after the actions below:
>
> � � � � rmmod ehci-hcd
> � � � � modprobe ehci-hcd
>

The issue is caused by returning failure of debugfs_create_dir, and
which may be fixed by replacing debugfs_remove with
debugfs_remove_recursive in ehci_hcd_cleanup.

Why does insmod show 'Unknown symbol in module' when module .init
return -ENOENT? The message does make us confused.

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Lei Ming
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From: Ming Lei on 28 Jul 2010 10:40
2010/7/28 Greg KH <greg(a)kroah.com>:
> On Wed, Jul 28, 2010 at 03:33:30PM +0800, Ming Lei wrote:
>> 2010/7/28 Ming Lei <tom.leiming(a)gmail.com>:
>> > Hi,
>> >
>> > 'Unknown symbol in module' ?happens after the actions below:
>> >
>> > ? ? ? ? rmmod ehci-hcd
>> > ? ? ? ? modprobe ehci-hcd
>> >
>>
>> The issue is caused by returning failure of debugfs_create_dir, and
>> which may be fixed by replacing debugfs_remove with
>> debugfs_remove_recursive in ehci_hcd_cleanup.
>
> Or we can properly clean up all of the files, right?
>
> Care to send a patch to resolve this?

Sent, follows the patch's title:

USB: ehci: fix remove of ehci debugfs dir

thanks,

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Lei Ming
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