Robert Watson wrote:
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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Thanks for clarification. Does it mean that I can ignore this notice
when dealing with USB framework ?
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