On Thu, 16 Feb 2017, Dan Carpenter <dan.carpen...@oracle.com> wrote:
> We want to free msm_host->bus_clks[0] so the > should be >=.
>
> Fixes: 6e0eb52eba9e ("drm/msm/dsi: Parse bus clocks from a list")
> Signed-off-by: Dan Carpenter <dan.carpen...@oracle.com>
>
> diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c 
> b/drivers/gpu/drm/msm/dsi/dsi_host.c
> index 1fc07ce24686..239e79b39a45 100644
> --- a/drivers/gpu/drm/msm/dsi/dsi_host.c
> +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c
> @@ -437,7 +437,7 @@ static int dsi_bus_clk_enable(struct msm_dsi_host 
> *msm_host)
>  
>       return 0;
>  err:
> -     for (; i > 0; i--)
> +     for (; i >= 0; i--)
>               clk_disable_unprepare(msm_host->bus_clks[i]);

By the looks of it this is also wrong. I didn't look at the functions,
but you probably don't want to unprepare something where prepare failed,
i.e. you want to -1 both the start and end offsets. Perhaps the right
fix is

        while (i--)
                clk_disable_unprepare(msm_host->bus_clks[i]);

which also seems to be widely used on error paths.

BR,
Jani.


>  
>       return ret;
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-- 
Jani Nikula, Intel Open Source Technology Center
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