Re: sierra gpl driver backport

On Tue, 11 Sep 2007, Anthony Tzouris wrote:

> Working on a project in which I need to backport the GPL Sierra Wireless
> Cell Modem driver.  The platform an ARM9 linux 2.6.5 kernel with a linux
> kernel 2.6.9 usb subsystem backport.  There is no option to upgrade the
> kernel on this project.
> 
> The sierra driver needs to be backported from linux kernel version
> 2.6.21 to 2.6.5.  I have tested the backport on the ARM9 and x86 linux
> 2.6.5 kernels and get similar results of the 3 usb-to-serial devices
> /dev/ttyUSB0, USB1, and USB2 being enumerated but the driver does not
> communicate serially to the cell modem through the /dev/ttyUSBx serial
> device.  On the ARM9 platform I end up getting three warnings in the USB
> Host Controller:
> 
> got unlink
> aborting urb
> aborted running urb
> 
> that ends up with the following warning message in the sierra driver:
> 
> sierra_indat_callback: nonzero status: -2 on endpoint
> 
> I did attempt to track down the -2 status (urb->status) but did not find
> anything in the kernel tree.
> 
> Does anyone with usb development experience from early to current 2.6.x
> linux usb development know generally what the cause of this problem
> might be?

-2 is -ENOENT (as defined in include/asm-generic/errno-base.h).  

According to Documentation/usb/error-codes.txt, -ENOENT in urb->status 
means that the URB was synchronously unlinked.

Alan Stern


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