netdev - Re: [Bugme-new] [Bug 28532] New: Link state change detection problem on Moschip MCS7832 [mcs7830]

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Message-Id: <20110207151401.d1db088a.akpm@linux-foundation.org>
Date:	Mon, 7 Feb 2011 15:14:01 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	netdev@...r.kernel.org, linux-usb@...r.kernel.org
Cc:	bugzilla-daemon@...zilla.kernel.org,
	bugme-daemon@...zilla.kernel.org, myxal.mxl@...il.com,
	Andreas Mohr <andi@...as.de>
Subject: Re: [Bugme-new] [Bug 28532] New: Link state change detection
 problem on Moschip MCS7832 [mcs7830]


(switched to email.  Please respond via emailed reply-to-all, not via the
bugzilla web interface).

On Mon, 7 Feb 2011 18:14:56 GMT
bugzilla-daemon@...zilla.kernel.org wrote:

> https://bugzilla.kernel.org/show_bug.cgi?id=28532
> 
>            Summary: Link state change detection problem on Moschip MCS7832
>                     [mcs7830]
>            Product: Drivers
>            Version: 2.5
>     Kernel Version: 2.6.38-rc2
>           Platform: All
>         OS/Version: Linux
>               Tree: Mainline
>             Status: NEW
>           Severity: normal
>           Priority: P1
>          Component: Network
>         AssignedTo: drivers_network@...nel-bugs.osdl.org
>         ReportedBy: myxal.mxl@...il.com
>         Regression: No
> 
> 
> Created an attachment (id=46752)
>  --> (https://bugzilla.kernel.org/attachment.cgi?id=46752)
> lsusb -vv output
> 
> Hi.
> 
> I have a network adapter which uses the aforementioned driver and while
> checking for the link state via ethtool reports the correct state, many
> networking userspace utilities seem to have no clue about it (NM 0.8.1 starts
> dhclient BEFORE any cable is plugged) - and more importantly, don't notice when
> the cable is (dis)connected. Since there's not even a kernel message when
> (dis)connecting the cable, I suspect the driver does not implement Link state
> change detection at all. Is this accurate?
> 
> LSCD works in Windows, where it's apparently implemented through periodic
> polling (judging by virtualbox's blinking USB icon).
> How is this situation normally handled? Is it kernel's job to do the polling?
> Or are userspace utilities expected to do this?
> 
> Docs to the chip are available here:
> http://www.moschip.com/data/products/MCS7830/Data%20Sheet_7830.pdf
> 

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