linux-kernel - Re: [S] Re: [linux-uwb] packet size problem

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Message-ID: <Pine.LNX.4.44L0.0806111032330.2459-100000@iolanthe.rowland.org>
Date:	Wed, 11 Jun 2008 10:39:01 -0400 (EDT)
From:	Alan Stern <stern@...land.harvard.edu>
To:	AntonioLin <antonio.lin@...ormicro.com>,
	Jens Axboe <axboe@...nel.dk>
cc:	David Vrabel <david.vrabel@....com>,
	USB list <linux-usb@...r.kernel.org>,
	Kernel development list <linux-kernel@...r.kernel.org>
Subject: Re: [S] Re: [linux-uwb] packet size problem

On Wed, 11 Jun 2008, AntonioLin wrote:

> Hi All,
> 
> I checked srb->device->request_queue->dma_alignment in usb_stor_bulk_Bulk_transport() routine. , the value is 1023.
> 
> But in usb_stor_bulk_transfer_sglist, the length of first element in sg array is 3584 which is not divisible by 1024.
> 
> 
> Can you post your /proc/bus/usb/devices ?
> 
> I don't know how to do this, could you descript moe about it ?
> (Sorry,I have few experience about Linux.)

All you have to do is:

	cat /proc/bus/usb/devices

Or even just tell your email client to include /proc/bus/usb/devices as
an attachment.  However some Linux distributions don't automatically
mount /proc/bus/usb.  If yours doesn't, you will have to do (as root):

	mount -t usbfs none /proc/bus/usb

before you can access /proc/bus/usb/devices.  But in any case it
doesn't matter, since you have checked that the value of dma_alignment
really is 1023.

Jens, this is a question for you.  How come we're getting an SG element
whose lenth is 3584 when the request_queue's dma_alignment mask is set
to 1023?  Is dma_alignment not the right parameter to set?

Alan Stern

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