* USB error numbers
@ 2003-09-08 12:21 root
2003-09-08 15:28 ` Randy.Dunlap
0 siblings, 1 reply; 2+ messages in thread
From: root @ 2003-09-08 12:21 UTC (permalink / raw)
To: linux-kernel
Where do the various numbers come from in messages such as
USB device not accepting new address=5 (error=-110), and what do they
"mean"?
I'm trying to work out why this happens when I plug in one of several
webcams (into any of several computers) and one webcam occasionally.
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: USB error numbers
2003-09-08 12:21 USB error numbers root
@ 2003-09-08 15:28 ` Randy.Dunlap
0 siblings, 0 replies; 2+ messages in thread
From: Randy.Dunlap @ 2003-09-08 15:28 UTC (permalink / raw)
To: root; +Cc: linux-kernel
> Where do the various numbers come from in messages such as
> USB device not accepting new address=5 (error=-110), and what do they
> "mean"?
> I'm trying to work out why this happens when I plug in one of several
> webcams (into any of several computers) and one webcam occasionally. -
Hm, the USB error numbers are listed/documented in
linux/Documentation/usb/error-codes.txt (by name).
Look in include/<asm-arch>/errno.h to match names to values
(or include/asm-generic/errno.h).
-110 for x86 is -ETIMEDOUT (USB returns negative error numbers).
It can mean that the device just wasn't responding, or it can mean
that there is a problem with USB interrupt routing. There is lots
of work going on in this area right now, especially related to ACPI
interrupt routing.
~Randy
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