Date: Sun, 30 Dec 2007 17:11:16 +0000 (GMT) From: Robert Watson <rwatson@FreeBSD.org> To: Tofig Suleymanov <tofig@freebsd.az> Cc: freebsd-net@freebsd.org Subject: Re: if_start running deferred for Giant Message-ID: <20071230170217.T6382@fledge.watson.org> In-Reply-To: <4777690B.1030403@freebsd.az> References: <4777690B.1030403@freebsd.az>
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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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