On Thu, Aug 30, 2018 at 11:36:11AM -0700, Douglas Anderson wrote:
> The function clk_round_rate() is defined to return a "long", not an
> "unsigned long". That's because it might return a negative error
> code. Change the call in geni_se_clk_tbl_get() to check for errors.
>
> NOTE: overall the idea that we should iterate over clk_round_rate() to
> try to reconstruct a table already present in the clock driver is
> questionable. Specifically:
> - This method relies on "clk_round_rate()" rounding up.
> - This method only works if the table is sorted and has no duplicates.
> ...this patch doesn't try to fix those problems, it just makes the
> error handling more correct.
>
> Fixes: eddac5af0654 ("soc: qcom: Add GENI based QUP Wrapper driver")
> Signed-off-by: Douglas Anderson <dianders@xxxxxxxxxxxx>
> ---
>
> drivers/soc/qcom/qcom-geni-se.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/soc/qcom/qcom-geni-se.c b/drivers/soc/qcom/qcom-geni-se.c
> index feed3db21c10..1b19b8428c4a 100644
> --- a/drivers/soc/qcom/qcom-geni-se.c
> +++ b/drivers/soc/qcom/qcom-geni-se.c
> @@ -513,7 +513,7 @@ EXPORT_SYMBOL(geni_se_resources_on);
> */
> int geni_se_clk_tbl_get(struct geni_se *se, unsigned long **tbl)
> {
> - unsigned long freq = 0;
> + long freq = 0;
nit: Since you are already touching this you could also remove the
pointless initialization, 'freq' is always assigned before it is used.
> int i;
>
> if (se->clk_perf_tbl) {
> @@ -529,7 +529,7 @@ int geni_se_clk_tbl_get(struct geni_se *se, unsigned long **tbl)
>
> for (i = 0; i < MAX_CLK_PERF_LEVEL; i++) {
> freq = clk_round_rate(se->clk, freq + 1);
> - if (!freq || freq == se->clk_perf_tbl[i - 1])
> + if (freq <= 0 || freq == se->clk_perf_tbl[i - 1])
> break;
> se->clk_perf_tbl[i] = freq;
> }
Reviewed-by: Matthias Kaehlcke <mka@xxxxxxxxxxxx>
