regression with 8e8dce065088833fc418bfa5fbf035cb0726c04c: USB: use kfifo to buffer usb-generic serial writes

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Hello,

recently I noticed, using a 2.6.34 linux kernel, that the sam-ba tool from 
Atmel doesn't work anymore. It can be used to program storage device using an 
AT91 controller. To use it, you need to run 'modprobe usbserial vendor=0x03eb 
product=0x6124' (See also 
http://www.at91.com/linux4sam/bin/view/Linux4SAM/SoftwareTools for more 
information)
Several linux version ago (up to 2.6.31 in fact) I could use this tool to 
connect to my boards and program them. But now I'm running a 2.6.34 kernel 
where this doesn't work anymore. I git bisected into this problem and found 
out the problem arises with the commit 
8e8dce065088833fc418bfa5fbf035cb0726c04c: USB: use kfifo to buffer usb-generic 
serial writes
Using this tool after the named commit it initially connects to the board and 
gets stuck on downloading a program.
Any ideas how to fix it? Feel free to ask any question unclear about this 
problem.

Best regards,
Alexander
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