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.
--
Lei Ming
2010/7/28 Ming Lei <[email protected]>:
> 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.
--
Lei Ming
On Wed, Jul 28, 2010 at 03:33:30PM +0800, Ming Lei wrote:
> 2010/7/28 Ming Lei <[email protected]>:
> > 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?
thanks,
greg k-h
2010/7/28 Greg KH <[email protected]>:
> On Wed, Jul 28, 2010 at 03:33:30PM +0800, Ming Lei wrote:
>> 2010/7/28 Ming Lei <[email protected]>:
>> > 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,
--
Lei Ming