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

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Message-ID: <4FB4613B.3020603@gmail.com>
Date:	Thu, 17 May 2012 10:23:55 +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 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 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.

Regards,
Xiao
>> Signed-off-by: Xiao Jiang <jgq516@...il.com>
>> ---
>>  drivers/net/usb/smsc95xx.c |    3 ++-
>>  1 files changed, 2 insertions(+), 1 deletions(-)
>>
>> diff --git a/drivers/net/usb/smsc95xx.c b/drivers/net/usb/smsc95xx.c
>> index 94ae669..e158288 100644
>> --- a/drivers/net/usb/smsc95xx.c
>> +++ b/drivers/net/usb/smsc95xx.c
>> @@ -1192,7 +1192,8 @@ static const struct driver_info smsc95xx_info = {
>>        .rx_fixup       = smsc95xx_rx_fixup,
>>        .tx_fixup       = smsc95xx_tx_fixup,
>>        .status         = smsc95xx_status,
>> -       .flags          = FLAG_ETHER | FLAG_SEND_ZLP | FLAG_LINK_INTR,
>> +       .flags          = FLAG_ETHER | FLAG_POINTTOPOINT | FLAG_SEND_ZLP |
>> +                         FLAG_LINK_INTR,
>>  };
>>
>>  static const struct usb_device_id products[] = {
>> --
>> 1.7.3
>>
>> --
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>>     
>
>
> Thanks,
>   

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