Re: [PATCH 04/15] drivers: net: cpsw: ethtool: fix accessing to suspended device

[Ivan Khoronzhuk]

On 16.06.16 15:48, Ivan Khoronzhuk wrote:
> On 15.06.16 19:45, Grygorii Strashko wrote:
> > On 06/15/2016 07:14 PM, Florian Fainelli wrote:
> > > On 06/15/2016 04:55 AM, Grygorii Strashko wrote:
> > > > The CPSW might be suspended by RPM if all ethX interfaces are down,
> > > > but it still could be accesible through ethtool interfce. In this case
> > > > ethtool operations, requiring registers access, will cause L3 errors and
> > > > CPSW crash.
> > > >
> > > > Hence, fix it by adding RPM get/put calls in ethtool callbcaks which
> > > > can access CPSW registers: .set_coalesce(), .get_ethtool_stats(),
> > > > .set_pauseparam(), .get_regs()
> > >
> > > Provided that you implement an ethtool_ops::begin, it will be called
> > > before each ethtool operation runs, so that could allow you to eliminate
> > > some of the duplication here. Conversely ethtool_ops::end terminates
> > > each operation and can be used for that purpose.
> >
> > Ah. Thanks for the advice. (assume you've meant .complete())
>
> Maybe better leave as is, I'm going to add two additional ehttool ops
> containing RPM sensitive part and not, better to split code on those,
> if possible...and hiding put/get in begin op can call rpm when it's not
> needed at all..

But it's not a big deal, ethtool operations are rarelly anyway, and have
impact only when interface is down that makes it even more rarely.

> >

--
Regards,
Ivan Khoronzhuk