lkml.org 
[lkml]   [2018]   [Dec]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] pinctrl: rza1: report if devm_kasptrinf() fails
Hi Nicholas, Linus,
I'm sorry I might have missed this

On Sat, Nov 24, 2018 at 05:30:33PM +0100, Nicholas Mc Guire wrote:
> devm_kasprintf() may return NULL on failure of internal allocation
> thus the assignments are not safe if not checked. On error
> rza1_pinctrl_register() respectively rza1_parse_gpiochip() return
> negative values so -ENOMEM in the (unlikely) failure case of
> devm_kasprintf() should be fine here.

devm_kasprintf() returns -ENOMEM in case of failure (which I agree it's
unlikely, but still...), so I guess it's fine returning -ENOMEM as well
here.

Acked-by: Jacopo Mondi <jacopo@jmondi.org>

Thanks
j

>
> Signed-off-by: Nicholas Mc Guire <hofrat@osadl.org>
> Fixes: 5a49b644b307 ("pinctrl: Renesas RZ/A1 pin and gpio controller")
> ---
>
> Problem was located with an experimental coccinelle script
>
> The dev_err() for this unlikely case is added so that a failures of
> rza1_pinctrl_register() respectively rza1_parse_gpiochip() can be
> understood as currently the negative return value is simply passed up
> the call stack but it would be hard to identify the cause.
>
> Patch was compile tested with: shmobile_defconfig (implies PINCTRL_RZA1=y)
>
> Patch is against 4.20-rc3 (localversion-next is next-20181123)
>
> drivers/pinctrl/pinctrl-rza1.c | 10 ++++++++++
> 1 file changed, 10 insertions(+)
>
> diff --git a/drivers/pinctrl/pinctrl-rza1.c b/drivers/pinctrl/pinctrl-rza1.c
> index 14eb576..2533df4 100644
> --- a/drivers/pinctrl/pinctrl-rza1.c
> +++ b/drivers/pinctrl/pinctrl-rza1.c
> @@ -1225,6 +1225,11 @@ static int rza1_parse_gpiochip(struct rza1_pinctrl *rza1_pctl,
> chip->base = -1;
> chip->label = devm_kasprintf(rza1_pctl->dev, GFP_KERNEL, "%pOFn",
> np);
> + if (!chip->label) {
> + dev_err(rza1_pctl->dev, "Failed to allocate label\n");
> + return -ENOMEM;
> + }
> +
> chip->ngpio = of_args.args[2];
> chip->of_node = np;
> chip->parent = rza1_pctl->dev;
> @@ -1326,6 +1331,11 @@ static int rza1_pinctrl_register(struct rza1_pinctrl *rza1_pctl)
> pins[i].number = i;
> pins[i].name = devm_kasprintf(rza1_pctl->dev, GFP_KERNEL,
> "P%u-%u", port, pin);
> + if (!pins[i].name) {
> + dev_err(rza1_pctl->dev,
> + "RZ/A1 pin controller allocation failed\n");
> + return -ENOMEM;
> + }
>
> if (i % RZA1_PINS_PER_PORT == 0) {
> /*
> --
> 2.1.4
>
[unhandled content-type:application/pgp-signature]
\
 
 \ /
  Last update: 2018-12-07 10:33    [W:0.035 / U:0.048 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site