linux-kernel - Re: [PATCH] clk: mux: Return a sane value on error

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Message-ID: <20131030194722.11662.27225@quantum>
Date:	Wed, 30 Oct 2013 12:47:22 -0700
From:	Mike Turquette <mturquette@...aro.org>
To:	Russ Dill <Russ.Dill@...com>, linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org, Russ Dill <Russ.Dill@...com>
Subject: Re: [PATCH] clk: mux: Return a sane value on error

Quoting Russ Dill (2013-10-21 01:59:50)
> The get_parent op is defined as returning u8, but clk-mux is
> returning negative values on error.  Code within drivers/clk/clk.c
> uses this return value as an index into an array which could
> cause an oops.
> 
> Signed-off-by: Russ Dill <Russ.Dill@...com>

Hi Russ,

Thanks for the fix. Haojian Zhuang sent an identical fix the day before
you so I took his in ;-)

Regards,
Mike

> ---
>  drivers/clk/clk-mux.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/clk/clk-mux.c b/drivers/clk/clk-mux.c
> index 4f96ff3..cc06015 100644
> --- a/drivers/clk/clk-mux.c
> +++ b/drivers/clk/clk-mux.c
> @@ -51,7 +51,7 @@ static u8 clk_mux_get_parent(struct clk_hw *hw)
>                 for (i = 0; i < num_parents; i++)
>                         if (mux->table[i] == val)
>                                 return i;
> -               return -EINVAL;
> +               return 0;
>         }
>  
>         if (val && (mux->flags & CLK_MUX_INDEX_BIT))
> @@ -61,7 +61,7 @@ static u8 clk_mux_get_parent(struct clk_hw *hw)
>                 val--;
>  
>         if (val >= num_parents)
> -               return -EINVAL;
> +               return 0;
>  
>         return val;
>  }
> -- 
> 1.8.3.2
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