2015-05-15 06:24:56

by Ricky Liang

[permalink] [raw]
Subject: [PATCH] clk: mediatek: Initialize clk flags

The variable init (struct clk_init_data) is allocated on the stack.
We weren't initializing the .flags field, so it contains random junk,
which can cause all kinds of interesting issues when the flags are
parsed by clk_register.

The best solution seems to just pass on the flags passed in to our
clk_register wrappers.

Signed-off-by: Ricky Liang <[email protected]>
---
drivers/clk/mediatek/clk-pll.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c
index 66154ca..72fe307 100644
--- a/drivers/clk/mediatek/clk-pll.c
+++ b/drivers/clk/mediatek/clk-pll.c
@@ -289,6 +289,7 @@ static struct clk *mtk_clk_register_pll(const struct mtk_pll_data *data,
init.ops = &mtk_pll_ops;
init.parent_names = &parent_name;
init.num_parents = 1;
+ init.flags = data->flags;

clk = clk_register(NULL, &pll->hw);

--
2.1.2


2015-05-15 18:37:14

by Stephen Boyd

[permalink] [raw]
Subject: Re: [PATCH] clk: mediatek: Initialize clk flags

On 05/15, Ricky Liang wrote:
> diff --git a/drivers/clk/mediatek/clk-pll.c b/drivers/clk/mediatek/clk-pll.c
> index 66154ca..72fe307 100644
> --- a/drivers/clk/mediatek/clk-pll.c
> +++ b/drivers/clk/mediatek/clk-pll.c
> @@ -289,6 +289,7 @@ static struct clk *mtk_clk_register_pll(const struct mtk_pll_data *data,
> init.ops = &mtk_pll_ops;
> init.parent_names = &parent_name;
> init.num_parents = 1;
> + init.flags = data->flags;

Wrong? It looks like plls[] in drivers/clk/mediatek/clk-mt8135.c
is putting mtk specific clock flags in this structure member.

How about initializing the structure to { } instead? That way if
we ever add more structure members we don't have to detect the
landmine laid here.

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