linux-kernel - Re: [PATCH 1/3] clk: Add error handling to clk_fetch_parent

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Message-ID: <20131002014031.9338.76351@quantum>
Date:	Tue, 01 Oct 2013 18:40:31 -0700
From:	Mike Turquette <mturquette@...aro.org>
To:	Tomasz Figa <tomasz.figa@...il.com>,
	linux-arm-kernel@...ts.infradead.org
Cc:	linux-kernel@...r.kernel.org,
	Sylwester Nawrocki <sylvester.nawrocki@...il.com>,
	Tomasz Figa <tomasz.figa@...il.com>
Subject: Re: [PATCH 1/3] clk: Add error handling to clk_fetch_parent_index()

Quoting Tomasz Figa (2013-09-28 17:37:14)
> There are at least two different error cases that can happen in
> clk_fetch_parent_index() function:
>  - allocation failure,
>  - parent clock lookup failure,
> however it returns only an u8, which is supposed to contain parent clock
> index.
> 
> This patch modified the function to return full int instead allowing
> positive clock indices and negative error codes to be returned. All
> users of this function are adjusted as well to handle the return value
> correctly.
> 
> Signed-off-by: Tomasz Figa <tomasz.figa@...il.com>

Thanks for the fixes. Taken into clk-next.

Regards,
Mike

> ---
>  drivers/clk/clk.c | 25 ++++++++++++++-----------
>  1 file changed, 14 insertions(+), 11 deletions(-)
> 
> diff --git a/drivers/clk/clk.c b/drivers/clk/clk.c
> index a004769..9e0a837 100644
> --- a/drivers/clk/clk.c
> +++ b/drivers/clk/clk.c
> @@ -1080,13 +1080,16 @@ unsigned long clk_get_rate(struct clk *clk)
>  }
>  EXPORT_SYMBOL_GPL(clk_get_rate);
>  
> -static u8 clk_fetch_parent_index(struct clk *clk, struct clk *parent)
> +static int clk_fetch_parent_index(struct clk *clk, struct clk *parent)
>  {
> -       u8 i;
> +       int i;
>  
> -       if (!clk->parents)
> +       if (!clk->parents) {
>                 clk->parents = kzalloc((sizeof(struct clk*) * clk->num_parents),
>                                                                 GFP_KERNEL);
> +               if (!clk->parents)
> +                       return -ENOMEM;
> +       }
>  
>         /*
>          * find index of new parent clock using cached parent ptrs,
> @@ -1095,15 +1098,15 @@ static u8 clk_fetch_parent_index(struct clk *clk, struct clk *parent)
>          */
>         for (i = 0; i < clk->num_parents; i++) {
>                 if (clk->parents && clk->parents[i] == parent)
> -                       break;
> +                       return i;
>                 else if (!strcmp(clk->parent_names[i], parent->name)) {
>                         if (clk->parents)
>                                 clk->parents[i] = __clk_lookup(parent->name);
> -                       break;
> +                       return i;
>                 }
>         }
>  
> -       return i;
> +       return -EINVAL;
>  }
>  
>  static void clk_reparent(struct clk *clk, struct clk *new_parent)
> @@ -1265,7 +1268,7 @@ static struct clk *clk_calc_new_rates(struct clk *clk, unsigned long rate)
>         struct clk *old_parent, *parent;
>         unsigned long best_parent_rate = 0;
>         unsigned long new_rate;
> -       u8 p_index = 0;
> +       int p_index = 0;
>  
>         /* sanity */
>         if (IS_ERR_OR_NULL(clk))
> @@ -1306,7 +1309,7 @@ static struct clk *clk_calc_new_rates(struct clk *clk, unsigned long rate)
>         /* try finding the new parent index */
>         if (parent) {
>                 p_index = clk_fetch_parent_index(clk, parent);
> -               if (p_index == clk->num_parents) {
> +               if (p_index < 0) {
>                         pr_debug("%s: clk %s can not be parent of clk %s\n",
>                                  __func__, parent->name, clk->name);
>                         return NULL;
> @@ -1568,7 +1571,7 @@ void __clk_reparent(struct clk *clk, struct clk *new_parent)
>  int clk_set_parent(struct clk *clk, struct clk *parent)
>  {
>         int ret = 0;
> -       u8 p_index = 0;
> +       int p_index = 0;
>         unsigned long p_rate = 0;
>  
>         if (!clk)
> @@ -1597,10 +1600,10 @@ int clk_set_parent(struct clk *clk, struct clk *parent)
>         if (parent) {
>                 p_index = clk_fetch_parent_index(clk, parent);
>                 p_rate = parent->rate;
> -               if (p_index == clk->num_parents) {
> +               if (p_index < 0) {
>                         pr_debug("%s: clk %s can not be parent of clk %s\n",
>                                         __func__, parent->name, clk->name);
> -                       ret = -EINVAL;
> +                       ret = p_index;
>                         goto out;
>                 }
>         }
> -- 
> 1.8.3.2
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