Re: [PATCH -stable] pinctrl: sh-pfc: r8a77970: remove SH_PFC_PIN_CFG_DRIVE_STRENGTH flag

[Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>]

Hi Niklas,

Thanks for your backport!

On Tue, Jul 17, 2018 at 5:24 PM Niklas Söderlund
<niklas.soderlund+renesas@xxxxxxxxxxxx> wrote:

commit 550b6f7e8cf93fc2753aa01e655ed5471012ab5a upstream.

> The datasheet does not document any registers to control drive strength,
> and no drive strength registers are for this reason described for this
> SoC. The flags indicating that drive strength can be controlled are
> however set for some pins in the driver.
>
> This leads to a NULL pointer dereference when the sh-pfc core tries to
> access the struct describing the drive strength registers, for example
> when reading the sysfs file pinconf-pins.
>
> Fix this by removing the SH_PFC_PIN_CFG_DRIVE_STRENGTH from all pins
>
> Fixes: b92ac66a1819602b ("pinctrl: sh-pfc: Add R8A77970 PFC support")
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@xxxxxxxxxxxx>

Reviewed-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>

> ---

> This is a backport of commit 550b6f7e8cf93fc2753aa01e655ed5471012ab5a
> from Linusw linux-pinctrl.git tree. It's applicable for v4.16 and v4.17.

Which is now upstream.

Gr{oetje,eeting}s,

                        Geert

--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds
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