Date: Mon, 31 Dec 2007 11:09:00 +0400 From: "Tofig Suleymanov" <tofig@freebsd.az> To: "Robert Watson" <rwatson@freebsd.org> Cc: freebsd-net@freebsd.org Subject: Re: if_start running deferred for Giant Message-ID: <342414370712302309i2fbaff2ex4888d51d51eaa99c@mail.gmail.com> In-Reply-To: <20071231002840.N21364@fledge.watson.org> References: <4777690B.1030403@freebsd.az> <20071230170217.T6382@fledge.watson.org> <47780CE4.3000302@freebsd.az> <20071231002840.N21364@fledge.watson.org>
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On 12/31/07, Robert Watson <rwatson@freebsd.org> wrote: > > 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 > Now it is clear to me. Thanks for your help.
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