Re: if_start running deferred for Giant

On 12/31/07, Robert Watson <rwatson@xxxxxxxxxxx> 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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