On Wed, 18 Jan 2006, Greg KH wrote:
> We can not call put_device() from irq context :(
>
> I added a "might_sleep()" to the driver core and get the following from
> the ehci driver. Any thoughts?
In principle the put_device and corresponding get_device calls aren't
needed. We don't release a usb_device structure until after disabling all
its endpoints, and disabling an endpoint will wait until all the URBs for
that endpoint have completed. So there's no reason to keep a reference to
the device structure for each URB.
I see that uhci-hcd is guilty of the same thing (reference acquired for
each QH, released while holding a spinlock). Probably each of the
host controller drivers is.
Alan Stern
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