On Sun, 30 Dec 2007, Tofig Suleymanov wrote:
I am writing a driver for Kyocera USB modem for FreeBSD and there are a few
questions that I am not able to solve alone. I would be grateful if someone
could point me into the right direction.Here is the first one:
Inside the USB_ATTACH() function I initialise the ifnet(9) structure and
return USB_ATTACH_SUCCESS_RETURN. Everything seems to be fine so far (I can
see the interface in ifconfig output) except the following error notice spit
to the console:
xxxxxx kernel: ib0: if_start running deferred for Giant
I am not sure what does this exactly mean.
Any help would be appreciated.
This occurs when a network device driver has declared itself IFF_NEEDSGIANT --
that is, has declared that it requires the Giant lock in order to operate.
As this is considered an undesirable state of affairs for a device driver, a
warning is printed. However, in the case of a USB device driver, it is
currently required as the USB framework is not MPSAFE, so requires Giant.
Robert N M Watson
Computer Laboratory
University of Cambridge
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