Re: [linux-usb-devel] [PATCH 2/2] usbatm: Detect usb device shutdownand ignore failed urbs.

From: Alan Stern
Date: Fri Feb 23 2007 - 11:16:43 EST

On Fri, 23 Feb 2007, Duncan Sands wrote:

> if you get ESHUTDOWN, does that mean that you are about to be disconnected,
> i.e. the disconnect method is about to be called? Or is it possible for the
> device to just sit there disabled, but not disconnected?

It is possible to receive ESHUTDOWN without being disconnected. For
instance, a race with suspend could cause it to happen (although if your
driver is written correctly that race should never occur). Another more
likely scenario is that you have an active URB while calling
usb_set_interface(); the endpoints for the old altsetting get disabled and
the URB returns with an ESHUTDOWN error.

Alan Stern

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