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Date: Fri, 9 Mar 2012 14:50:26 -0800
From: "Turquette, Mike" <mturquette@...com>
To: Sascha Hauer <s.hauer@...gutronix.de>
Cc: Russell King <linux@....linux.org.uk>,
Andrew Lunn <andrew@...n.ch>, linaro-dev@...ts.linaro.org,
Grant Likely <grant.likely@...retlab.ca>,
Saravana Kannan <skannan@...eaurora.org>,
Jamie Iles <jamie@...ieiles.com>,
Jeremy Kerr <jeremy.kerr@...onical.com>,
Magnus Damm <magnus.damm@...il.com>,
Deepak Saxena <dsaxena@...aro.org>,
linux-arm-kernel@...ts.infradead.org,
Arnd Bergman <arnd.bergmann@...aro.org>, patches@...aro.org,
Rob Herring <rob.herring@...xeda.com>,
Thomas Gleixner <tglx@...utronix.de>,
Richard Zhao <richard.zhao@...aro.org>,
Shawn Guo <shawn.guo@...escale.com>,
Paul Walmsley <paul@...an.com>,
Linus Walleij <linus.walleij@...ricsson.com>,
Mark Brown <broonie@...nsource.wolfsonmicro.com>,
Stephen Boyd <sboyd@...eaurora.org>,
linux-kernel@...r.kernel.org,
Amit Kucheria <amit.kucheria@...aro.org>
Subject: Re: [PATCH v5 4/4] clk: basic clock hardware types
On Wed, Mar 7, 2012 at 1:20 PM, Sascha Hauer <s.hauer@...gutronix.de> wrote:
> On Sat, Mar 03, 2012 at 12:29:01AM -0800, Mike Turquette wrote:
>> +struct clk *clk_register_divider(struct device *dev, const char *name,
>> + const char *parent_name, unsigned long flags,
>> + void __iomem *reg, u8 shift, u8 width,
>> + u8 clk_divider_flags, spinlock_t *lock)
>> +{
>> + struct clk_divider *div;
>> + char **parent_names = NULL;
>> + u8 len;
>> +
>> + div = kmalloc(sizeof(struct clk_divider), GFP_KERNEL);
>> +
>> + if (!div) {
>> + pr_err("%s: could not allocate divider clk\n", __func__);
>> + return ERR_PTR(-ENOMEM);
>> + }
>> +
>> + /* struct clk_divider assignments */
>> + div->reg = reg;
>> + div->shift = shift;
>> + div->width = width;
>> + div->flags = clk_divider_flags;
>> + div->lock = lock;
>> +
>> + if (parent_name) {
>> + parent_names = kmalloc(sizeof(char *), GFP_KERNEL);
>> +
>> + if (! parent_names)
>> + goto out;
>> +
>> + len = sizeof(char) * strlen(parent_name);
>> +
>> + parent_names[0] = kmalloc(len, GFP_KERNEL);
>> +
>> + if (!parent_names[0])
>> + goto out;
>> +
>> + strncpy(parent_names[0], parent_name, len);
>> + }
>> +
>> +out:
>> + return clk_register(dev, name,
>> + &clk_divider_ops, &div->hw,
>> + parent_names,
>> + (parent_name ? 1 : 0),
>> + flags);
>> +}
>
> clk_register_divider and also clk_register_gate have some problems.
> First you allocate memory with exactly the string length without
> the terminating 0. Then the functions leak memory when clk_register
> fails. Could you fold in the following patch to fix this?
Thanks for the patch Sascha. This has been pulled into v6 and tested.
Regards,
Mike
>
> Sascha
>
> 8<--------------------------------------------------
>
> fix divider/gate registration
>
> Signed-off-by: Sascha Hauer <s.hauer@...gutronix.de>
> ---
> drivers/clk/clk-divider.c | 34 +++++++++++++++-------------------
> drivers/clk/clk-gate.c | 33 ++++++++++++++-------------------
> include/linux/clk-provider.h | 2 ++
> 3 files changed, 31 insertions(+), 38 deletions(-)
>
> diff --git a/drivers/clk/clk-divider.c b/drivers/clk/clk-divider.c
> index 8f02930..99b6b55 100644
> --- a/drivers/clk/clk-divider.c
> +++ b/drivers/clk/clk-divider.c
> @@ -156,14 +156,13 @@ struct clk *clk_register_divider(struct device *dev, const char *name,
> u8 clk_divider_flags, spinlock_t *lock)
> {
> struct clk_divider *div;
> - char **parent_names = NULL;
> - u8 len;
> + struct clk *clk;
>
> - div = kmalloc(sizeof(struct clk_divider), GFP_KERNEL);
> + div = kzalloc(sizeof(struct clk_divider), GFP_KERNEL);
>
> if (!div) {
> pr_err("%s: could not allocate divider clk\n", __func__);
> - return ERR_PTR(-ENOMEM);
> + return NULL;
> }
>
> /* struct clk_divider assignments */
> @@ -174,25 +173,22 @@ struct clk *clk_register_divider(struct device *dev, const char *name,
> div->lock = lock;
>
> if (parent_name) {
> - parent_names = kmalloc(sizeof(char *), GFP_KERNEL);
> -
> - if (! parent_names)
> - goto out;
> -
> - len = sizeof(char) * strlen(parent_name);
> -
> - parent_names[0] = kmalloc(len, GFP_KERNEL);
> -
> - if (!parent_names[0])
> + div->parent[0] = kstrdup(parent_name, GFP_KERNEL);
> + if (!div->parent[0])
> goto out;
> -
> - strncpy(parent_names[0], parent_name, len);
> }
>
> -out:
> - return clk_register(dev, name,
> + clk = clk_register(dev, name,
> &clk_divider_ops, &div->hw,
> - parent_names,
> + div->parent,
> (parent_name ? 1 : 0),
> flags);
> + if (clk)
> + return clk;
> +
> +out:
> + kfree(div->parent[0]);
> + kfree(div);
> +
> + return NULL;
> }
> diff --git a/drivers/clk/clk-gate.c b/drivers/clk/clk-gate.c
> index e831f7b..92c0489 100644
> --- a/drivers/clk/clk-gate.c
> +++ b/drivers/clk/clk-gate.c
> @@ -80,14 +80,13 @@ struct clk *clk_register_gate(struct device *dev, const char *name,
> u8 clk_gate_flags, spinlock_t *lock)
> {
> struct clk_gate *gate;
> - char **parent_names = NULL;
> - u8 len;
> + struct clk *clk;
>
> - gate = kmalloc(sizeof(struct clk_gate), GFP_KERNEL);
> + gate = kzalloc(sizeof(struct clk_gate), GFP_KERNEL);
>
> if (!gate) {
> pr_err("%s: could not allocate gated clk\n", __func__);
> - return ERR_PTR(-ENOMEM);
> + return NULL;
> }
>
> /* struct clk_gate assignments */
> @@ -97,25 +96,21 @@ struct clk *clk_register_gate(struct device *dev, const char *name,
> gate->lock = lock;
>
> if (parent_name) {
> - parent_names = kmalloc(sizeof(char *), GFP_KERNEL);
> -
> - if (! parent_names)
> - goto out;
> -
> - len = sizeof(char) * strlen(parent_name);
> -
> - parent_names[0] = kmalloc(len, GFP_KERNEL);
> -
> - if (!parent_names[0])
> + gate->parent[0] = kstrdup(parent_name, GFP_KERNEL);
> + if (!gate->parent[0])
> goto out;
> -
> - strncpy(parent_names[0], parent_name, len);
> }
>
> -out:
> - return clk_register(dev, name,
> + clk = clk_register(dev, name,
> &clk_gate_ops, &gate->hw,
> - parent_names,
> + gate->parent,
> (parent_name ? 1 : 0),
> flags);
> + if (clk)
> + return clk;
> +out:
> + kfree(gate->parent[0]);
> + kfree(gate);
> +
> + return NULL;
> }
> diff --git a/include/linux/clk-provider.h b/include/linux/clk-provider.h
> index 9b7dd5e..ed1f918 100644
> --- a/include/linux/clk-provider.h
> +++ b/include/linux/clk-provider.h
> @@ -174,6 +174,7 @@ struct clk_gate {
> u8 bit_idx;
> u8 flags;
> spinlock_t *lock;
> + char *parent[1];
> };
>
> #define CLK_GATE_SET_TO_DISABLE BIT(0)
> @@ -210,6 +211,7 @@ struct clk_divider {
> u8 width;
> u8 flags;
> spinlock_t *lock;
> + char *parent[1];
> };
>
> #define CLK_DIVIDER_ONE_BASED BIT(0)
> --
> 1.7.9.1
>
> --
> Pengutronix e.K. | |
> Industrial Linux Solutions | http://www.pengutronix.de/ |
> Peiner Str. 6-8, 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 |
> Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 |
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