[linux-usb-devel] Some ideas to ease usb driver developement.

[James Courtier-Dutton]

When someone is writing a kernel module that uses the usb core, and one 
makes a call to the usb core that gets rejected for some reason. e.g. 
usb core returns -EINVAL. It would be nice if the usb core could printk 
a kernel message explaining which parameter was invalid.

I recently was getting -EINVAL returned to some calls I made to 
usb_submit_urb(), and the only way I tracked down what was wrong, was by 
adding lots of printk's to the usb core so I could see at which point 
-EINVAL was being returned. It turned out to be "interval" not being 
set, but a simple printk message from usb core could have saved me a bit 
to time tracking this.

Cheers
James


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