From: Matthew Dharm <mdharm-usb@one-eyed-alien.net>
To: linux-hotplug@vger.kernel.org
Subject: Re: usb-storage data transfer anomaly
Date: Thu, 21 Mar 2002 20:49:19 +0000 [thread overview]
Message-ID: <marc-linux-hotplug-101674464600404@msgid-missing> (raw)
In-Reply-To: <marc-linux-hotplug-101670835213830@msgid-missing>
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One idea.... get a different setup.
The device is likely disconnecting because the hub is killing power due to
over-current. Which is bogus -- I have one of these devices, and I know
their current draw is legit.
Is the hub powered? Likely that's what you need.
Matt
On Wed, Mar 20, 2002 at 08:53:17PM -0800, Bajo, Allison wrote:
> I was debugging 2.4.19-pre3 using a SanDisk SDDR-31 CF Card Reader when I observed the following behavior:
>
> 1. The device (SDDR-31) was intermittently disconnected by the hub and then reconnected even though the device was present all the time. The trigger for this event was plugging in a CF card into the reader.
>
> 2. As a result of (1), I receive a CSW from a previous CBW before the disconnect and reconnect in (1).
>
> 3. When usb_stor_Bulk_transport ( ) returns with a USB_STOR_TRANPORT_ERROR, usb_stor_invoke_transport ( ) tries to reset the device but fails on the reset.
>
> 4. Any subsequent CBW and CSW pair will be skewed. The CBW will receive the CSW of a previous CBW. At this point it is not recoverable except a reboot.
>
>
> Example traffic:
> CBW 0
> CSW 0
>
> Disconnect
> Reconnect
>
> CBW 1
> CSW 0
>
> CBW 2
> CSW 1
>
> ...
>
> I think you get the picture. Any ideas.
>
> - Allison B
>
>
> _______________________________________________
> Linux-hotplug-devel mailing list http://linux-hotplug.sourceforge.net
> Linux-hotplug-devel@lists.sourceforge.net
> https://lists.sourceforge.net/lists/listinfo/linux-hotplug-devel
--
Matthew Dharm Home: mdharm-usb@one-eyed-alien.net
Maintainer, Linux USB Mass Storage Driver
I say, what are all those naked people doing?
-- Big client to Stef
User Friendly, 12/14/1997
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prev parent reply other threads:[~2002-03-21 20:49 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2002-03-21 4:53 usb-storage data transfer anomaly Bajo, Allison
2002-03-21 20:49 ` Matthew Dharm [this message]
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