[PATCH 0/4] arm: mvebu: add missing of_node_put and iounmap

[PATCH 0/4] arm: mvebu: add missing of_node_put and iounmap

[Jisheng Zhang]

These patches add missing of_node_put() to fix reference leak or
iounmap in setup/probe error path.

Jisheng Zhang (4):
  arm: mvebu: add missing of_node_put() to fix reference leak
  bus: mvebu: add missing of_node_put() to fix reference leak
  clk: mvebu: add missing iounmap
  pinctrl: mvebu: add missing iounmap

 arch/arm/mach-mvebu/armada-370-xp.c     |  1 +
 arch/arm/mach-mvebu/coherency.c         |  8 +++++++-
 arch/arm/mach-mvebu/platsmp.c           |  1 +
 arch/arm/mach-mvebu/pmsu.c              |  1 +
 arch/arm/mach-mvebu/system-controller.c |  1 +
 drivers/bus/mvebu-mbus.c                |  6 +++++-
 drivers/clk/mvebu/clk-cpu.c             |  4 +++-
 drivers/clk/mvebu/common.c              | 18 ++++++++++++------
 drivers/pinctrl/mvebu/pinctrl-mvebu.c   | 24 +++++++++++++++++-------
 9 files changed, 48 insertions(+), 16 deletions(-)

-- 
1.8.4.rc3

[PATCH 1/4] arm: mvebu: add missing of_node_put() to fix reference leak

[Jisheng Zhang]

Add of_node_put to properly decrement the refcount when we are
done using a given node.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
---
 arch/arm/mach-mvebu/armada-370-xp.c     | 1 +
 arch/arm/mach-mvebu/coherency.c         | 8 +++++++-
 arch/arm/mach-mvebu/platsmp.c           | 1 +
 arch/arm/mach-mvebu/pmsu.c              | 1 +
 arch/arm/mach-mvebu/system-controller.c | 1 +
 5 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/arch/arm/mach-mvebu/armada-370-xp.c b/arch/arm/mach-mvebu/armada-370-xp.c
index 97cbb80..8a1ae83 100644
--- a/arch/arm/mach-mvebu/armada-370-xp.c
+++ b/arch/arm/mach-mvebu/armada-370-xp.c
@@ -64,6 +64,7 @@ static void __init armada_370_xp_mbus_init(void)
 			ARMADA_370_XP_MBUS_WINS_SIZE,
 			of_translate_address(dn, &sdram_wins_offs),
 			ARMADA_370_XP_SDRAM_WINS_SIZE);
+	of_node_put(dn);
 }
 
 static void __init armada_370_xp_timer_and_clk_init(void)
diff --git a/arch/arm/mach-mvebu/coherency.c b/arch/arm/mach-mvebu/coherency.c
index 4c24303..58adf2f 100644
--- a/arch/arm/mach-mvebu/coherency.c
+++ b/arch/arm/mach-mvebu/coherency.c
@@ -140,6 +140,7 @@ int __init coherency_init(void)
 		coherency_base = of_iomap(np, 0);
 		coherency_cpu_base = of_iomap(np, 1);
 		set_cpu_coherent(cpu_logical_map(smp_processor_id()), 0);
+		of_node_put(np);
 	}
 
 	return 0;
@@ -147,9 +148,14 @@ int __init coherency_init(void)
 
 static int __init coherency_late_init(void)
 {
-	if (of_find_matching_node(NULL, of_coherency_table))
+	struct device_node *np;
+
+	np = of_find_matching_node(NULL, of_coherency_table);
+	if (np) {
 		bus_register_notifier(&platform_bus_type,
 				      &mvebu_hwcc_platform_nb);
+		of_node_put(np);
+	}
 	return 0;
 }
 
diff --git a/arch/arm/mach-mvebu/platsmp.c b/arch/arm/mach-mvebu/platsmp.c
index ce81d30..e7edb82 100644
--- a/arch/arm/mach-mvebu/platsmp.c
+++ b/arch/arm/mach-mvebu/platsmp.c
@@ -95,6 +95,7 @@ static void __init armada_xp_smp_init_cpus(void)
 		panic("No 'cpus' node found\n");
 
 	ncores = of_get_child_count(np);
+	of_node_put(np);
 	if (ncores == 0 || ncores > ARMADA_XP_MAX_CPUS)
 		panic("Invalid number of CPUs in DT\n");
 
diff --git a/arch/arm/mach-mvebu/pmsu.c b/arch/arm/mach-mvebu/pmsu.c
index 3cc4bef..27fc4f0 100644
--- a/arch/arm/mach-mvebu/pmsu.c
+++ b/arch/arm/mach-mvebu/pmsu.c
@@ -67,6 +67,7 @@ int __init armada_370_xp_pmsu_init(void)
 		pr_info("Initializing Power Management Service Unit\n");
 		pmsu_mp_base = of_iomap(np, 0);
 		pmsu_reset_base = of_iomap(np, 1);
+		of_node_put(np);
 	}
 
 	return 0;
diff --git a/arch/arm/mach-mvebu/system-controller.c b/arch/arm/mach-mvebu/system-controller.c
index f875124..5175083c 100644
--- a/arch/arm/mach-mvebu/system-controller.c
+++ b/arch/arm/mach-mvebu/system-controller.c
@@ -98,6 +98,7 @@ static int __init mvebu_system_controller_init(void)
 		BUG_ON(!match);
 		system_controller_base = of_iomap(np, 0);
 		mvebu_sc = (struct mvebu_system_controller *)match->data;
+		of_node_put(np);
 	}
 
 	return 0;
-- 
1.8.4.rc3

[PATCH 2/4] bus: mvebu: add missing of_node_put() to fix reference leak

[Jisheng Zhang]

Add of_node_put to properly decrement the refcount when we are
done using a given node.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
---
 drivers/bus/mvebu-mbus.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/bus/mvebu-mbus.c b/drivers/bus/mvebu-mbus.c
index 33c6947..20da90f 100644
--- a/drivers/bus/mvebu-mbus.c
+++ b/drivers/bus/mvebu-mbus.c
@@ -837,6 +837,7 @@ int __init mvebu_mbus_init(const char *soc, phys_addr_t mbuswins_phys_base,
 {
 	struct mvebu_mbus_state *mbus = &mbus_state;
 	const struct of_device_id *of_id;
+	struct device_node *np;
 	int win;
 
 	for (of_id = of_mvebu_mbus_ids; of_id->compatible; of_id++)
@@ -860,8 +861,11 @@ int __init mvebu_mbus_init(const char *soc, phys_addr_t mbuswins_phys_base,
 		return -ENOMEM;
 	}
 
-	if (of_find_compatible_node(NULL, NULL, "marvell,coherency-fabric"))
+	np = of_find_compatible_node(NULL, NULL, "marvell,coherency-fabric");
+	if (np) {
 		mbus->hw_io_coherency = 1;
+		of_node_put(np);
+	}
 
 	for (win = 0; win < mbus->soc->num_wins; win++)
 		mvebu_mbus_disable_window(mbus, win);
-- 
1.8.4.rc3

[PATCH 3/4] clk: mvebu: add missing iounmap

[Jisheng Zhang]

Add missing iounmap to setup error path.

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
---
 drivers/clk/mvebu/clk-cpu.c |  4 +++-
 drivers/clk/mvebu/common.c  | 18 ++++++++++++------
 2 files changed, 15 insertions(+), 7 deletions(-)

diff --git a/drivers/clk/mvebu/clk-cpu.c b/drivers/clk/mvebu/clk-cpu.c
index b0fbc07..1466865 100644
--- a/drivers/clk/mvebu/clk-cpu.c
+++ b/drivers/clk/mvebu/clk-cpu.c
@@ -119,7 +119,7 @@ void __init of_cpu_clk_setup(struct device_node *node)
 
 	cpuclk = kzalloc(ncpus * sizeof(*cpuclk), GFP_KERNEL);
 	if (WARN_ON(!cpuclk))
-		return;
+		goto cpuclk_out;
 
 	clks = kzalloc(ncpus * sizeof(*clks), GFP_KERNEL);
 	if (WARN_ON(!clks))
@@ -170,6 +170,8 @@ bail_out:
 		kfree(cpuclk[ncpus].clk_name);
 clks_out:
 	kfree(cpuclk);
+cpuclk_out:
+	iounmap(clock_complex_base);
 }
 
 CLK_OF_DECLARE(armada_xp_cpu_clock, "marvell,armada-xp-cpu-clock",
diff --git a/drivers/clk/mvebu/common.c b/drivers/clk/mvebu/common.c
index adaa4a1..6b415f9 100644
--- a/drivers/clk/mvebu/common.c
+++ b/drivers/clk/mvebu/common.c
@@ -45,8 +45,10 @@ void __init mvebu_coreclk_setup(struct device_node *np,
 	clk_data.clk_num = 2 + desc->num_ratios;
 	clk_data.clks = kzalloc(clk_data.clk_num * sizeof(struct clk *),
 				GFP_KERNEL);
-	if (WARN_ON(!clk_data.clks))
+	if (WARN_ON(!clk_data.clks)) {
+		iounmap(base);
 		return;
+	}
 
 	/* Register TCLK */
 	of_property_read_string_index(np, "clock-output-names", 0,
@@ -134,7 +136,7 @@ void __init mvebu_clk_gating_setup(struct device_node *np,
 
 	ctrl = kzalloc(sizeof(*ctrl), GFP_KERNEL);
 	if (WARN_ON(!ctrl))
-		return;
+		goto ctrl_out;
 
 	spin_lock_init(&ctrl->lock);
 
@@ -145,10 +147,8 @@ void __init mvebu_clk_gating_setup(struct device_node *np,
 	ctrl->num_gates = n;
 	ctrl->gates = kzalloc(ctrl->num_gates * sizeof(struct clk *),
 			      GFP_KERNEL);
-	if (WARN_ON(!ctrl->gates)) {
-		kfree(ctrl);
-		return;
-	}
+	if (WARN_ON(!ctrl->gates))
+		goto bail_out;
 
 	for (n = 0; n < ctrl->num_gates; n++) {
 		const char *parent =
@@ -160,4 +160,10 @@ void __init mvebu_clk_gating_setup(struct device_node *np,
 	}
 
 	of_clk_add_provider(np, clk_gating_get_src, ctrl);
+
+	return;
+bail_out:
+	kfree(ctrl);
+ctrl_out:
+	iounmap(base);
 }
-- 
1.8.4.rc3

Re: [PATCH 3/4] clk: mvebu: add missing iounmap

[Mike Turquette]

Quoting Jisheng Zhang (2013-08-22 05:46:50)
> Add missing iounmap to setup error path.
> 
> Signed-off-by: Jisheng Zhang <jszhang@marvell.com>

Patch looks good with one minor nitpick below.

> @@ -145,10 +147,8 @@ void __init mvebu_clk_gating_setup(struct device_node *np,
>         ctrl->num_gates = n;
>         ctrl->gates = kzalloc(ctrl->num_gates * sizeof(struct clk *),
>                               GFP_KERNEL);
> -       if (WARN_ON(!ctrl->gates)) {
> -               kfree(ctrl);
> -               return;
> -       }
> +       if (WARN_ON(!ctrl->gates))
> +               goto bail_out;
>  
>         for (n = 0; n < ctrl->num_gates; n++) {
>                 const char *parent =
> @@ -160,4 +160,10 @@ void __init mvebu_clk_gating_setup(struct device_node *np,
>         }
>  
>         of_clk_add_provider(np, clk_gating_get_src, ctrl);
> +
> +       return;
> +bail_out:
> +       kfree(ctrl);
> +ctrl_out:
> +       iounmap(base);

bail_out is not the best name. How about gates_out?

Regards,
Mike

[PATCH 4/4] pinctrl: mvebu: add missing iounmap

[Jisheng Zhang]

Add missing iounmap to prove error path and remove path

Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
---
 drivers/pinctrl/mvebu/pinctrl-mvebu.c | 24 +++++++++++++++++-------
 1 file changed, 17 insertions(+), 7 deletions(-)

diff --git a/drivers/pinctrl/mvebu/pinctrl-mvebu.c b/drivers/pinctrl/mvebu/pinctrl-mvebu.c
index bb7ddb1..d1ac6b7 100644
--- a/drivers/pinctrl/mvebu/pinctrl-mvebu.c
+++ b/drivers/pinctrl/mvebu/pinctrl-mvebu.c
@@ -601,7 +601,8 @@ int mvebu_pinctrl_probe(struct platform_device *pdev)
 			GFP_KERNEL);
 	if (!pctl) {
 		dev_err(&pdev->dev, "unable to alloc driver\n");
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto bail_out;
 	}
 
 	pctl->desc.name = dev_name(&pdev->dev);
@@ -631,7 +632,8 @@ int mvebu_pinctrl_probe(struct platform_device *pdev)
 		if (ctrl->mpp_get || ctrl->mpp_set) {
 			if (!ctrl->name || !ctrl->mpp_get || !ctrl->mpp_set) {
 				dev_err(&pdev->dev, "wrong soc control info\n");
-				return -EINVAL;
+				ret = -EINVAL;
+				goto bail_out;
 			}
 			pctl->num_groups += 1;
 			continue;
@@ -641,7 +643,8 @@ int mvebu_pinctrl_probe(struct platform_device *pdev)
 		names = devm_kzalloc(&pdev->dev, ctrl->npins * 8, GFP_KERNEL);
 		if (!names) {
 			dev_err(&pdev->dev, "failed to alloc mpp names\n");
-			return -ENOMEM;
+			ret = -ENOMEM;
+			goto bail_out;
 		}
 		for (k = 0; k < ctrl->npins; k++)
 			sprintf(names + 8*k, "mpp%d", ctrl->pid+k);
@@ -653,7 +656,8 @@ int mvebu_pinctrl_probe(struct platform_device *pdev)
 			     sizeof(struct pinctrl_pin_desc), GFP_KERNEL);
 	if (!pdesc) {
 		dev_err(&pdev->dev, "failed to alloc pinctrl pins\n");
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto bail_out;
 	}
 
 	for (n = 0; n < pctl->desc.npins; n++)
@@ -664,7 +668,8 @@ int mvebu_pinctrl_probe(struct platform_device *pdev)
 			     sizeof(struct mvebu_pinctrl_group), GFP_KERNEL);
 	if (!pctl->groups) {
 		dev_err(&pdev->dev, "failed to alloc pinctrl groups\n");
-		return -ENOMEM;
+		ret = -ENOMEM;
+		goto bail_out;
 	}
 
 	/* assign mpp controls to groups */
@@ -735,13 +740,14 @@ int mvebu_pinctrl_probe(struct platform_device *pdev)
 	ret = mvebu_pinctrl_build_functions(pdev, pctl);
 	if (ret) {
 		dev_err(&pdev->dev, "unable to build functions\n");
-		return ret;
+		goto bail_out;
 	}
 
 	pctl->pctldev = pinctrl_register(&pctl->desc, &pdev->dev, pctl);
 	if (!pctl->pctldev) {
 		dev_err(&pdev->dev, "unable to register pinctrl driver\n");
-		return -EINVAL;
+		ret = -EINVAL;
+		goto bail_out;
 	}
 
 	dev_info(&pdev->dev, "registered pinctrl driver\n");
@@ -751,11 +757,15 @@ int mvebu_pinctrl_probe(struct platform_device *pdev)
 		pinctrl_add_gpio_range(pctl->pctldev, &soc->gpioranges[n]);
 
 	return 0;
+bail_out:
+	iounmap(base);
+	return ret;
 }
 
 int mvebu_pinctrl_remove(struct platform_device *pdev)
 {
 	struct mvebu_pinctrl *pctl = platform_get_drvdata(pdev);
+	iounmap(pctl->base);
 	pinctrl_unregister(pctl->pctldev);
 	return 0;
 }
-- 
1.8.4.rc3

Re: [PATCH 4/4] pinctrl: mvebu: add missing iounmap

[Ezequiel Garcia]

Hi Jisheng,

On Thu, Aug 22, 2013 at 08:46:51PM +0800, Jisheng Zhang wrote:
> Add missing iounmap to prove error path and remove path
> 
> Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
> ---
>  drivers/pinctrl/mvebu/pinctrl-mvebu.c | 24 +++++++++++++++++-------
>  1 file changed, 17 insertions(+), 7 deletions(-)

How about using devm_ioremap_resource() instead?

-- 
Ezequiel García, Free Electrons
Embedded Linux, Kernel and Android Engineering
http://free-electrons.com

Re: [PATCH 4/4] pinctrl: mvebu: add missing iounmap

[Linus Walleij]

On Thu, Aug 22, 2013 at 3:22 PM, Ezequiel Garcia
<ezequiel.garcia@free-electrons.com> wrote:
> On Thu, Aug 22, 2013 at 08:46:51PM +0800, Jisheng Zhang wrote:
>> Add missing iounmap to prove error path and remove path
>>
>> Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
>> ---
>>  drivers/pinctrl/mvebu/pinctrl-mvebu.c | 24 +++++++++++++++++-------
>>  1 file changed, 17 insertions(+), 7 deletions(-)
>
> How about using devm_ioremap_resource() instead?

Yeah that's the right solution, Jisheng can you fix this?

Yours,
Linus Walleij

Re: [PATCH 4/4] pinctrl: mvebu: add missing iounmap

[Ezequiel Garcia]

On Fri, Aug 23, 2013 at 08:06:02PM +0200, Linus Walleij wrote:
> On Thu, Aug 22, 2013 at 3:22 PM, Ezequiel Garcia
> <ezequiel.garcia@free-electrons.com> wrote:
> > On Thu, Aug 22, 2013 at 08:46:51PM +0800, Jisheng Zhang wrote:
> >> Add missing iounmap to prove error path and remove path
> >>
> >> Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
> >> ---
> >>  drivers/pinctrl/mvebu/pinctrl-mvebu.c | 24 +++++++++++++++++-------
> >>  1 file changed, 17 insertions(+), 7 deletions(-)
> >
> > How about using devm_ioremap_resource() instead?
> 
> Yeah that's the right solution, Jisheng can you fix this?
> 

I think he already did that, there's a v2 floating around
with such change. I plan to give it a test, maybe tomorrow,
if I can find some spare time.

Regards,
-- 
Ezequiel García, Free Electrons
Embedded Linux, Kernel and Android Engineering
http://free-electrons.com

Re: [PATCH 4/4] pinctrl: mvebu: add missing iounmap

[Jisheng Zhang]

Hi Linus and Ezequiel,

On Fri, 23 Aug 2013 13:19:26 -0700
Ezequiel Garcia <ezequiel.garcia@free-electrons.com> wrote:

> On Fri, Aug 23, 2013 at 08:06:02PM +0200, Linus Walleij wrote:
> > On Thu, Aug 22, 2013 at 3:22 PM, Ezequiel Garcia
> > <ezequiel.garcia@free-electrons.com> wrote:
> > > On Thu, Aug 22, 2013 at 08:46:51PM +0800, Jisheng Zhang wrote:
> > >> Add missing iounmap to prove error path and remove path
> > >>
> > >> Signed-off-by: Jisheng Zhang <jszhang@marvell.com>
> > >> ---
> > >>  drivers/pinctrl/mvebu/pinctrl-mvebu.c | 24 +++++++++++++++++-------
> > >>  1 file changed, 17 insertions(+), 7 deletions(-)
> > >
> > > How about using devm_ioremap_resource() instead?
> > 
> > Yeah that's the right solution, Jisheng can you fix this?
> > 
> 
> I think he already did that, there's a v2 floating around
> with such change. I plan to give it a test, maybe tomorrow,
> if I can find some spare time.
> 

Yep. Here is the V2

http://lists.infradead.org/pipermail/linux-arm-kernel/2013-August/194072.html

Thank you for your help,
Jisheng