Re: [PATCH V3 2/4] soc/tegra: pmc: Correct type of variable for tegra_pmc_readl()

Jon Hunter
2016-05-05T09:49:58Z

On 04/05/16 12:39, Laxman Dewangan wrote:
> The function tegra_pmc_readl() returns the u32 type data and hence
> change the data type of variable where this data is stored to u32
> type.
>
> Signed-off-by: Laxman Dewangan <ldewangan@nvidia.com>
>
> ---
> Changes from V1:
> -This is new in series as per discussion on V1 series to use u32 for
> tegra_pmc_readl.
>
> Changes from V2:
> - Make unsigned long to u32 for some missed variable from V1.
> ---
> drivers/soc/tegra/pmc.c | 24 ++++++++++++++----------
> 1 file changed, 14 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/soc/tegra/pmc.c b/drivers/soc/tegra/pmc.c
> index 2c3f1f9..eff9425 100644
> --- a/drivers/soc/tegra/pmc.c
> +++ b/drivers/soc/tegra/pmc.c
> @@ -844,7 +844,8 @@ static void tegra_powergate_init(struct tegra_pmc *pmc)
> static int tegra_io_rail_prepare(unsigned int id, unsigned long *request,
> unsigned long *status, unsigned int *bit)
> {
> - unsigned long rate, value;
> + unsigned long rate;
> + u32 value;
>
> *bit = id % 32;
>
> @@ -868,17 +869,18 @@ static int tegra_io_rail_prepare(unsigned int id, unsigned long *request,
> tegra_pmc_writel(DPD_SAMPLE_ENABLE, DPD_SAMPLE);
>
> /* must be at least 200 ns, in APB (PCLK) clock cycles */
> - value = DIV_ROUND_UP(1000000000, rate);
> - value = DIV_ROUND_UP(200, value);
> + rate = DIV_ROUND_UP(1000000000, rate);
> + rate = DIV_ROUND_UP(200, rate);
> + value = (u32)rate;

Although it is unlikely, I think that we should check it is less
than U32_MAX, return an error if it is not.

Cheers
Jon