On Mon, Jan 09, 2017 at 08:53:51PM +0000, Ian Thompson wrote:
> We are running some embedded boards based on the Altera SOC with its 
> stmicro/stmmac.
> 
> The v1.7 code runs well.

> I've just compiled v1.8 and replaced the v1.7 binary, no other changes, and 
> it fails ....

Possibly you compiled v1.8 with the wrong kernel headers?

Run both versions under strace to see what exactly is being passed and
returned.

Also, try running the hwstamp_ctl utility to see whether the error
appears there.

> The function that generates the failed ioctl error hasn't changed, so is this 
> a problem with the added RTNL link code?

No, the rtnl code does not use the HWTSTAMP ioctl.

Thanks,
Richard

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