Re: [PATCH] mediatek/clk-mt8173-apmixedsys: use devm_of_iomap to avoid resource leak in clk_mt8173_apmixed_probe

[AngeloGioacchino Del Regno]

Il 12/05/23 02:39, Chen-Yu Tsai ha scritto:
> On Tue, May 9, 2023 at 11:12 AM Hao Ge <gehao@xxxxxxxxxx> wrote:
> > Use devm_platform_ioremap_resource to take the place of of_iomap for
> > avoid that we don't called iounmap when return some error or remove
> > device.
> >
> > Fixes: 4c02c9af3cb9 ("clk: mediatek: mt8173: Break down clock drivers and allow module build")
> > Signed-off-by: Hao Ge <gehao@xxxxxxxxxx>
> > ---
> >   drivers/clk/mediatek/clk-mt8173-apmixedsys.c | 4 ++--
> >   1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/clk/mediatek/clk-mt8173-apmixedsys.c b/drivers/clk/mediatek/clk-mt8173-apmixedsys.c
> > index 8c2aa8b0f39e..8a2a88c63d15 100644
> > --- a/drivers/clk/mediatek/clk-mt8173-apmixedsys.c
> > +++ b/drivers/clk/mediatek/clk-mt8173-apmixedsys.c
> > @@ -146,8 +146,8 @@ static int clk_mt8173_apmixed_probe(struct platform_device *pdev)
> >          struct clk_hw *hw;
> >          int r;
> >
> > -       base = of_iomap(node, 0);
> > -       if (!base)
> > +       base = devm_of_iomap(&pdev->dev, node, 0, NULL);
> > +       if (IS_ERR(base))
>
>  From lib/devres.c:
>
>   * Please Note: This is not a one-to-one replacement for of_iomap() because the
>   * of_iomap() function does not track whether the region is already mapped.  If
>   * two drivers try to map the same memory, the of_iomap() function will succeed
>   * but the devm_of_iomap() function will return -EBUSY.
>
> The register range for apmixedsys given in mt8173.dtsi overlaps with
> the HDMI phy. I'm concerned that would cause issues.

I agree, that will cause issues.

Regards,
Angelo