On 10/21/2016 11:37 AM, Eric W. Biederman wrote: > David Miller <davem at davemloft.net> writes: > >> From: ebiederm at xmission.com (Eric W. Biederman) >> Date: Fri, 21 Oct 2016 00:26:55 -0500 >> >>> So as far as I can tell you are advocating for a change to support a >>> driver doing something that is completely pointless. So no let's not >>> export this symbol. Please fix the driver to do something less >>> pointless instead. >> >> FLorian explained his reasoning for doing what he is doing in this >> specific driver and it made sense to me. > > What doesn't make sense to me is not doing that for any other kind of > reboot. > > Of the 3 uses of kexec_in_progres in the kernel (not counting this one) > I think there is only one of them that is really valid. And that one > is only valid because it is the least horrible thing the pci layer can > do. (AKA it is a hack even there). > > It really is nonsense having methods do different things depending on > context and that is why kexec_in_progress is not exeported. > > As far as I can tell the use of kexec_in_progress winds up being > a fragile hack that will just cause more problems later on. > > Florian is there a good readon why you don't just do? Checking kexec_in_progress allowed not to turn the PHY on for a normal reboot case, since we don't necessarily know when it will be re-initialized next, so in that sense it's a power optimization that is nice to have. > > static void bcm_sf2_sw_shutdown(struct platform_device *pdev) > { > struct bcm_sf2_priv *priv = platform_get_drvdata(pdev); > > /* For a kernel about to be kexec'd we want to keep the GPHY on for a > * successful MDIO bus scan to occur. If we did turn off the GPHY > * before (e.g: port_disable), this will also power it back on. > */ > if (priv->hw_params.num_gphy == 1) > bcm_sf2_gphy_enable_set(priv->dev->ds, true); > } > > I certainly don't see anything in the changelog to explain why that > isn't done. That would result in an identical behavior for what I am after, David, shall I send a revert plus this? -- Florian