netdev - Re: [PATCH 1/1] smsc95xx: add FLAG_POINTTOPOINT flag for driver

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Date:	Thu, 17 May 2012 17:51:04 +0800
From:	Xiao Jiang <jgq516@...il.com>
To:	Ming Lei <tom.leiming@...il.com>
CC:	steve.glendinning@...c.com, gregkh@...uxfoundation.org,
	netdev@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/1] smsc95xx: add FLAG_POINTTOPOINT flag for driver_info

Ming Lei wrote:
> On Thu, May 17, 2012 at 10:23 AM, Xiao Jiang <jgq516@...il.com> wrote:
>   
>> Ming Lei wrote:
>>     
>>> On Wed, May 16, 2012 at 4:01 PM,  <jgq516@...il.com> wrote:
>>>
>>>       
>>>> From: Xiao Jiang <jgq516@...il.com>
>>>>
>>>> commit c26134 introduced FLAG_POINTTOPOINT flag for USB ethernet devices
>>>> which possibly use "usb%d" names, add this flag to make sure pandaboard
>>>> can mount nfs with smsc95xx NIC.
>>>>
>>>>         
>>> Without the flag, I also can mount nfs successfully on my Pandaboard...
>>>       
>
> I always mount nfs in console, and not tried to mount nfs as root fs.
>
>   
>>>       
>> I have pulled latest tree
>> (git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
>> commit 0e93b4b304ae052ba1bc73f6d34a68556fe93429), and enable related options
>> (USB_NET_SMSC95XX,
>> USB_EHCI_HCD and USB_EHCI_HCD_OMAP) with omap2plus_config, However the
>> kernel still can't mount
>> nfs, pls see below infos.
>>
>> [    3.114105] smsc95xx v1.0.4
>> [    4.533752] smsc95xx 1-1.1:1.0: *eth0*: register 'smsc95xx' at
>> usb-ehci-omap.0-1.1, smsc95xx USB 2.0 Ethernet, fe:b9:1b:07:8e:d1
>> [  108.854217] VFS: Unable to mount root fs via NFS, trying floppy.
>> [  108.861114] VFS: Cannot open root device "nfs" or unknown-block(2,0):
>> error -6
>> [  108.868713] Please append a correct "root=" boot option; here are the
>> available partitions:
>> [  108.877655] b300         7761920 mmcblk0  driver: mmcblk
>> [  108.883239]   b301           40131 mmcblk0p1
>> 00000000-0000-0000-0000-000000000mmcblk0p1
>> [  108.891662]   b302         7719232 mmcblk0p2
>> 00000000-0000-0000-0000-000000000mmcblk0p2
>> [  108.900146] Kernel panic - not syncing: VFS: Unable to mount root fs on
>> unknown-block(2,0)
>>
>> BTW: I tested it with OMAP4430 ES2.2 pandaboard, the issue can be solved
>> with apply the patch.
>>
>> Is there something which I missed? thanks.
>>     
>
> What is your kernel parameter? Maybe you use 'usb%d' in kernel parameter for
> mounting nfs as root fs. If so, could you try 'eth%d' in kernel cmd?
>
> In fact, smsc95xx is a real LAN interface, and 'eth%d' should be prefered name
> as described in changelog of commit
> c261344d3ce3edac781f9d3c7eabe2e96d8e8fe8(usbnet:use eth%d name for
> known ethernet devices)
>
>   
Thanks for your notice, I used wrong kernel parameter.

Regards,
Xiao
> Thanks,
>   

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