[U-Boot] [PATCH 1/3] dm: timer: refuse timers with zero clock_rate
Bin Meng
bmeng.cn at gmail.com
Thu Jan 7 06:29:43 CET 2016
On Thu, Jan 7, 2016 at 1:33 AM, Stephen Warren <swarren at wwwdotorg.org> wrote:
> From: Stephen Warren <swarren at nvidia.com>
>
> If a timer has a zero clock_rate, get_tbclk() will return zero for it,
> which will cause tick_to_time() to perform a division-by-zero, which will
> crash U-Boot.
>
> Signed-off-by: Stephen Warren <swarren at nvidia.com>
> ---
> drivers/timer/timer-uclass.c | 11 +++++++++++
> 1 file changed, 11 insertions(+)
>
> diff --git a/drivers/timer/timer-uclass.c b/drivers/timer/timer-uclass.c
> index aca421bdea33..0771562c600d 100644
> --- a/drivers/timer/timer-uclass.c
> +++ b/drivers/timer/timer-uclass.c
> @@ -47,6 +47,16 @@ static int timer_pre_probe(struct udevice *dev)
> return 0;
> }
>
> +static int timer_post_probe(struct udevice *dev)
> +{
> + struct timer_dev_priv *uc_priv = dev_get_uclass_priv(dev);
> +
> + if (!uc_priv->clock_rate)
> + return -EINVAL;
Should we just panic here?
> +
> + return 0;
> +}
> +
> u64 timer_conv_64(u32 count)
> {
> /* increment tbh if tbl has rolled over */
> @@ -60,5 +70,6 @@ UCLASS_DRIVER(timer) = {
> .id = UCLASS_TIMER,
> .name = "timer",
> .pre_probe = timer_pre_probe,
> + .post_probe = timer_post_probe,
> .per_device_auto_alloc_size = sizeof(struct timer_dev_priv),
> };
> --
Regards,
Bin
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