if_start running deferred for Giant
rwatson at FreeBSD.org
Sun Dec 30 16:29:49 PST 2007
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
> 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
University of Cambridge
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