linux-kernel - RE: [EXT] [PATCH] net: fec: add a check for CONFIG

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Message-ID: <VI1PR0402MB36000BE1C169ECA035BE3610FF790@VI1PR0402MB3600.eurprd04.prod.outlook.com>
Date:   Wed, 6 Nov 2019 10:17:56 +0000
From:   Andy Duan <fugang.duan@....com>
To:     Chuhong Yuan <hslester96@...il.com>
CC:     "David S . Miller" <davem@...emloft.net>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [EXT] [PATCH] net: fec: add a check for CONFIG_PM to avoid clock
 count mis-match

From: Chuhong Yuan <hslester96@...il.com> Sent: Wednesday, November 6, 2019 4:29 PM
> On Wed, Nov 6, 2019 at 4:13 PM Andy Duan <fugang.duan@....com> wrote:
> >
> > From: Chuhong Yuan <hslester96@...il.com> Sent: Wednesday, November
> 6,
> > 2019 4:01 PM
> > > If CONFIG_PM is enabled, runtime pm will work and call
> > > runtime_suspend automatically to disable clks.
> > > Therefore, remove only needs to disable clks when CONFIG_PM is
> disabled.
> > > Add this check to avoid clock count mis-match caused by double-disable.
> > >
> > > This patch depends on patch
> > > ("net: fec: add missed clk_disable_unprepare in remove").
> > >
> > Please add Fixes tag here.
> >
> 
> The previous patch has not been merged to linux, so I do not know which
> commit ID should be used.

It should be merged into net-next tree.

Andy
> 
> > Andy
> > > Signed-off-by: Chuhong Yuan <hslester96@...il.com>
> > > ---
> > >  drivers/net/ethernet/freescale/fec_main.c | 2 ++
> > >  1 file changed, 2 insertions(+)
> > >
> > > diff --git a/drivers/net/ethernet/freescale/fec_main.c
> > > b/drivers/net/ethernet/freescale/fec_main.c
> > > index a9c386b63581..696550f4972f 100644
> > > --- a/drivers/net/ethernet/freescale/fec_main.c
> > > +++ b/drivers/net/ethernet/freescale/fec_main.c
> > > @@ -3645,8 +3645,10 @@ fec_drv_remove(struct platform_device
> *pdev)
> > >                 regulator_disable(fep->reg_phy);
> > >         pm_runtime_put(&pdev->dev);
> > >         pm_runtime_disable(&pdev->dev);
> > > +#ifndef CONFIG_PM
> > >         clk_disable_unprepare(fep->clk_ahb);
> > >         clk_disable_unprepare(fep->clk_ipg);
> > > +#endif
> > >         if (of_phy_is_fixed_link(np))
> > >                 of_phy_deregister_fixed_link(np);
> > >         of_node_put(fep->phy_node);
> > > --
> > > 2.23.0
> >