Re: [PATCH] gpu: drm: nouveau: Use list_for_each_entry_from_reverse

[Arushi Singhal <arushisinghal19971997@xxxxxxxxx>]

On Tue, Mar 27, 2018 at 2:44 PM, Ben Skeggs <skeggsb@xxxxxxxxx> wrote:

On 27 March 2018 at 19:11, Arushi Singhal
<arushisinghal19971997@gmail.com> wrote:
> It's better to use "list_for_each_entry_from_reverse" for iterating list
> than "for loop" as it makes the code more clear to read.
> This patch replace "for loop" with "list_for_each_entry_from_reverse"
> and remove "cstate" variable as it is redundant in the code.
I would prefer to also see "start" renamed to "cstate" with this change.

Hello Ben

Yes, using cstate is more accurate, as most of the functions are using "cstate" variable.

Best

Arushi

Ben.

>
> Signed-off-by: Arushi Singhal <arushisinghal19971997@gmail.com>
> ---
>  drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c | 8 +++-----
>  1 file changed, 3 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c
> index 81c3567..5e56f74 100644
> --- a/drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c
> +++ b/drivers/gpu/drm/nouveau/nvkm/subdev/clk/base.c
> @@ -113,7 +113,6 @@ nvkm_cstate_find_best(struct nvkm_clk *clk, struct nvkm_pstate *pstate,
>  {
>         struct nvkm_device *device = clk->subdev.device;
>         struct nvkm_volt *volt = device->volt;
> -       struct nvkm_cstate *cstate;
>         int max_volt;
>
>         if (!pstate || !start)
> @@ -133,13 +132,12 @@ nvkm_cstate_find_best(struct nvkm_clk *clk, struct nvkm_pstate *pstate,
>                 max_volt = min(max_volt,
>                                nvkm_volt_map(volt, volt->max2_id, clk->temp));
>
> -       for (cstate = start; &cstate->head != &pstate->list;
> -            cstate = list_prev_entry(cstate, head)) {
> -               if (nvkm_cstate_valid(clk, cstate, max_volt, clk->temp))
> +       list_for_each_entry_from_reverse(start, &pstate->list, head) {
> +               if (nvkm_cstate_valid(clk, start, max_volt, clk->temp))
>                         break;
>         }
>
> -       return cstate;
> +       return start;
>  }
>
>  static struct nvkm_cstate *
> --
> 2.7.4
>

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