On Mon, Jul 09, 2018 at 04:28:41PM -0300, Fabio Estevam wrote:
> On Mon, Jul 9, 2018 at 4:16 PM, Nicholas Mc Guire <hofrat@xxxxxxxxx> wrote:
> > of_iompa() can return NULL so that return needs to be checked and NULL
>
> s/of_iompa/of_iomap/
sorry - thats a stupid one.
>
> > treated as failure. While at it also take care of the missing
> > of_node_put() in the error path.
> >
> > Signed-off-by: Nicholas Mc Guire <hofrat@xxxxxxxxx>
> > Fixes: commit afa17a500a36 ("net/can: add driver for mscan family & mpc52xx_mscan")
> > ---
> >
> > Problem was found by an experimental coccinelle script
> >
> > Patch was compiletested with: mpc5200_defconfig + CONFIG_CAN=y,
> > CONFIG_CAN_MSCAN=y, CONFIG_CAN_MPC5XXX=y
> > (with a number of sparse warnings not related to the proposed change)
> >
> > Patch is against 4.18-rc3 (localversion-next is next-20180706)
> >
> > drivers/net/can/mscan/mpc5xxx_can.c | 5 +++++
> > 1 file changed, 5 insertions(+)
> >
> > diff --git a/drivers/net/can/mscan/mpc5xxx_can.c b/drivers/net/can/mscan/mpc5xxx_can.c
> > index c7427bd..2949a38 100644
> > --- a/drivers/net/can/mscan/mpc5xxx_can.c
> > +++ b/drivers/net/can/mscan/mpc5xxx_can.c
> > @@ -86,6 +86,11 @@ static u32 mpc52xx_can_get_clock(struct platform_device *ofdev,
> > return 0;
> > }
> > cdm = of_iomap(np_cdm, 0);
> > + if (!cdm) {
> > + of_node_put(np_cdm);
> > + dev_err(&ofdev->dev, "can't map clock node!\n");
> > + return 0;
>
> I think you should return an error code here. -ENOMEM maybe?
I don´t think so the code above this part return 0 on error and a
valid frequency on success so returning -ENOMEM would probably be
mistaken as a frequency !
thx!
hofrat
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