Re: [PATCH v6 05/12] watchdog: wdt-uclass.c: keep track of each device's running state

Wolfgang Denk
2021-08-19T11:36:05Z

Dear Rasmus,

please check your patches for proper error handling.

In message <20210819095706.3585923-6-rasmus.villemoes@prevas.dk> you wrote:
>
...
> diff --git a/drivers/watchdog/wdt-uclass.c b/drivers/watchdog/wdt-uclass.c
> index 0a1f43771c..358fc68e27 100644
> --- a/drivers/watchdog/wdt-uclass.c
> +++ b/drivers/watchdog/wdt-uclass.c
...
> @@ -86,8 +89,11 @@ int wdt_start(struct udevice *dev, u64 timeout_ms, ulong flags)
> return -ENOSYS;
>
> ret = ops->start(dev, timeout_ms, flags);
> - if (ret == 0)
> - gd->flags |= GD_FLG_WDT_READY;
> + if (ret == 0) {
> + struct wdt_priv *priv = dev_get_uclass_priv(dev);
> +
> + priv->running = true;

dev_get_uclass_priv() can return NULL, in which case you would be
dereferencing a NULL pointer...

> @@ -101,8 +107,11 @@ int wdt_stop(struct udevice *dev)
> return -ENOSYS;
>
> ret = ops->stop(dev);
> - if (ret == 0)
> - gd->flags &= ~GD_FLG_WDT_READY;
> + if (ret == 0) {
> + struct wdt_priv *priv = dev_get_uclass_priv(dev);
> +
> + priv->running = false;

Same here.

> @@ -156,6 +165,9 @@ void watchdog_reset(void)
>
> dev = gd->watchdog_dev;
> priv = dev_get_uclass_priv(dev);
> + if (!priv->running)
> + return;
> +

And here again.

Best regards,

Wolfgang Denk

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