Date: Mon, 31 Dec 2007 00:29:47 +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: <20071231002840.N21364@fledge.watson.org> In-Reply-To: <47780CE4.3000302@freebsd.az> References: <4777690B.1030403@freebsd.az> <20071230170217.T6382@fledge.watson.org> <47780CE4.3000302@freebsd.az>
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On Mon, 31 Dec 2007, Tofig Suleymanov wrote: >>> 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. > > Thanks for clarification. Does it mean that I can ignore this notice when > dealing with USB framework ? For now, yes. When, at some point, the USB framework is MPSAFE, we'll need to remove IFF_NEEDSGIANT, and I'd make sure that your device driver is as ready as it can be to operate Giant-free once that's done. Robert N M Watson Computer Laboratory University of Cambridge
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