if_start running deferred for Giant
tofig at freebsd.az
Sun Dec 30 13:26:11 PST 2007
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
> freebsd-net at freebsd.org mailing list
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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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