[PATCH 00/12] add missing of_node_put after of_device_is_available

[PATCH 00/12] add missing of_node_put after of_device_is_available

[Julia Lawall]

Failure of of_device_is_available implies that the device node
should be put, if it is not used otherwise.

---

 arch/arm/mach-omap2/display.c                            |    4 +++-
 arch/powerpc/platforms/83xx/usb.c                        |    4 +++-
 drivers/bus/arm-cci.c                                    |    4 +++-
 drivers/cpufreq/armada-8k-cpufreq.c                      |    4 +++-
 drivers/crypto/amcc/crypto4xx_trng.c                     |    4 +++-
 drivers/firmware/psci.c                                  |    4 +++-
 drivers/gpu/drm/omapdrm/dss/omapdss-boot-init.c          |    4 +++-
 drivers/gpu/drm/tegra/rgb.c                              |    4 +++-
 drivers/phy/tegra/xusb.c                                 |    4 +++-
 drivers/soc/amlogic/meson-gx-socinfo.c                   |    4 +++-
 drivers/tee/optee/core.c                                 |    4 +++-
 drivers/video/fbdev/omap2/omapfb/dss/omapdss-boot-init.c |    4 +++-
 12 files changed, 36 insertions(+), 12 deletions(-)

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[PATCH 09/12] meson-gx-socinfo: add missing of_node_put after of_device_is_available

[Julia Lawall]

Add an of_node_put when a tested device node is not available.

The semantic patch that fixes this problem is as follows
(http://coccinelle.lip6.fr):

// <smpl>
@@
identifier f;
local idexpression e;
expression x;
@@

e = f(...);
... when != of_node_put(e)
    when != x = e
    when != e = x
    when any
if (<+...of_device_is_available(e)...+>) {
  ... when != of_node_put(e)
(
  return e;
|
+ of_node_put(e);
  return ...;
)
}
// </smpl>

Fixes: a9daaba2965e8 ("soc: Add Amlogic SoC Information driver")
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
 drivers/soc/amlogic/meson-gx-socinfo.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff -u -p a/drivers/soc/amlogic/meson-gx-socinfo.c b/drivers/soc/amlogic/meson-gx-socinfo.c
--- a/drivers/soc/amlogic/meson-gx-socinfo.c
+++ b/drivers/soc/amlogic/meson-gx-socinfo.c
@@ -123,8 +123,10 @@ static int __init meson_gx_socinfo_init(
 		return -ENODEV;
 
 	/* check if interface is enabled */
-	if (!of_device_is_available(np))
+	if (!of_device_is_available(np)) {
+		of_node_put(np);
 		return -ENODEV;
+	}
 
 	/* check if chip-id is available */
 	if (!of_property_read_bool(np, "amlogic,has-chip-id"))


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[PATCH 10/12] cpufreq: ap806: add missing of_node_put after of_device_is_available

[Julia Lawall]

Add an of_node_put when a tested device node is not available.

The semantic patch that fixes this problem is as follows
(http://coccinelle.lip6.fr):

// <smpl>
@@
identifier f;
local idexpression e;
expression x;
@@

e = f(...);
... when != of_node_put(e)
    when != x = e
    when != e = x
    when any
if (<+...of_device_is_available(e)...+>) {
  ... when != of_node_put(e)
(
  return e;
|
+ of_node_put(e);
  return ...;
)
}
// </smpl>

Fixes: f525a670533d9 ("cpufreq: ap806: add cpufreq driver for Armada 8K")
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
 drivers/cpufreq/armada-8k-cpufreq.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff -u -p a/drivers/cpufreq/armada-8k-cpufreq.c b/drivers/cpufreq/armada-8k-cpufreq.c
--- a/drivers/cpufreq/armada-8k-cpufreq.c
+++ b/drivers/cpufreq/armada-8k-cpufreq.c
@@ -128,8 +128,10 @@ static int __init armada_8k_cpufreq_init
 	struct cpumask cpus;
 
 	node = of_find_compatible_node(NULL, NULL, "marvell,ap806-cpu-clock");
-	if (!node || !of_device_is_available(node))
+	if (!node || !of_device_is_available(node)) {
+		of_node_put(node);
 		return -ENODEV;
+	}
 
 	nb_cpus = num_possible_cpus();
 	freq_tables = kcalloc(nb_cpus, sizeof(*freq_tables), GFP_KERNEL);


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[PATCH 11/12] ARM: OMAP2+: add missing of_node_put after of_device_is_available

[Julia Lawall]

Add an of_node_put when a tested device node is not available.

The semantic patch that fixes this problem is as follows
(http://coccinelle.lip6.fr):

// <smpl>
@@
identifier f;
local idexpression e;
expression x;
@@

e = f(...);
... when != of_node_put(e)
    when != x = e
    when != e = x
    when any
if (<+...of_device_is_available(e)...+>) {
  ... when != of_node_put(e)
(
  return e;
|
+ of_node_put(e);
  return ...;
)
}
// </smpl>

Fixes: e0c827aca0730 ("drm/omap: Populate DSS children in omapdss driver")
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
 arch/arm/mach-omap2/display.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff -u -p a/arch/arm/mach-omap2/display.c b/arch/arm/mach-omap2/display.c
--- a/arch/arm/mach-omap2/display.c
+++ b/arch/arm/mach-omap2/display.c
@@ -250,8 +250,10 @@ static int __init omapdss_init_of(void)
 	if (!node)
 		return 0;
 
-	if (!of_device_is_available(node))
+	if (!of_device_is_available(node)) {
+		of_node_put(node);
 		return 0;
+	}
 
 	pdev = of_find_device_by_node(node);
 


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[PATCH 12/12] drivers: firmware: psci: add missing of_node_put after of_device_is_available

[Julia Lawall]

Add an of_node_put when a tested device node is not available.

The semantic patch that fixes this problem is as follows
(http://coccinelle.lip6.fr):

// <smpl>
@@
identifier f;
local idexpression e;
expression x;
@@

e = f(...);
... when != of_node_put(e)
    when != x = e
    when != e = x
    when any
if (<+...of_device_is_available(e)...+>) {
  ... when != of_node_put(e)
(
  return e;
|
+ of_node_put(e);
  return ...;
)
}
// </smpl>

Fixes: d09a0011ec0d5 ("drivers: psci: Allow PSCI node to be disabled")
Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

---
 drivers/firmware/psci.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff -u -p a/drivers/firmware/psci.c b/drivers/firmware/psci.c
--- a/drivers/firmware/psci.c
+++ b/drivers/firmware/psci.c
@@ -677,8 +677,10 @@ int __init psci_dt_init(void)
 
 	np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
 
-	if (!np || !of_device_is_available(np))
+	if (!np || !of_device_is_available(np)) {
+		of_node_put(np);
 		return -ENODEV;
+	}
 
 	init_fn = (psci_initcall_t)matched_np->data;
 	return init_fn(np);


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Re: [PATCH 10/12] cpufreq: ap806: add missing of_node_put after of_device_is_available

[Viresh Kumar]

On 23-02-19, 14:20, Julia Lawall wrote:
> Add an of_node_put when a tested device node is not available.
> 
> The semantic patch that fixes this problem is as follows
> (http://coccinelle.lip6.fr):
> 
> // <smpl>
> @@
> identifier f;
> local idexpression e;
> expression x;
> @@
> 
> e = f(...);
> ... when != of_node_put(e)
>     when != x = e
>     when != e = x
>     when any
> if (<+...of_device_is_available(e)...+>) {
>   ... when != of_node_put(e)
> (
>   return e;
> |
> + of_node_put(e);
>   return ...;
> )
> }
> // </smpl>
> 
> Fixes: f525a670533d9 ("cpufreq: ap806: add cpufreq driver for Armada 8K")
> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
> 
> ---
>  drivers/cpufreq/armada-8k-cpufreq.c |    4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff -u -p a/drivers/cpufreq/armada-8k-cpufreq.c b/drivers/cpufreq/armada-8k-cpufreq.c
> --- a/drivers/cpufreq/armada-8k-cpufreq.c
> +++ b/drivers/cpufreq/armada-8k-cpufreq.c
> @@ -128,8 +128,10 @@ static int __init armada_8k_cpufreq_init
>  	struct cpumask cpus;
>  
>  	node = of_find_compatible_node(NULL, NULL, "marvell,ap806-cpu-clock");
> -	if (!node || !of_device_is_available(node))
> +	if (!node || !of_device_is_available(node)) {
> +		of_node_put(node);
>  		return -ENODEV;
> +	}
>  
>  	nb_cpus = num_possible_cpus();
>  	freq_tables = kcalloc(nb_cpus, sizeof(*freq_tables), GFP_KERNEL);

Applied. Thanks.

-- 
viresh

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Re: [PATCH 09/12] meson-gx-socinfo: add missing of_node_put after of_device_is_available

[Kevin Hilman]

Julia Lawall <Julia.Lawall@lip6.fr> writes:

> Add an of_node_put when a tested device node is not available.

[...] 
]

> Fixes: a9daaba2965e8 ("soc: Add Amlogic SoC Information driver")
> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

Patch applied,

Thanks,

Kevin

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Re: [PATCH 11/12] ARM: OMAP2+: add missing of_node_put after of_device_is_available

[Tony Lindgren]

* Julia Lawall <Julia.Lawall@lip6.fr> [190223 13:58]:
> Add an of_node_put when a tested device node is not available.
> 
> The semantic patch that fixes this problem is as follows
> (http://coccinelle.lip6.fr):
> 
> // <smpl>
> @@
> identifier f;
> local idexpression e;
> expression x;
> @@
> 
> e = f(...);
> ... when != of_node_put(e)
>     when != x = e
>     when != e = x
>     when any
> if (<+...of_device_is_available(e)...+>) {
>   ... when != of_node_put(e)
> (
>   return e;
> |
> + of_node_put(e);
>   return ...;
> )
> }
> // </smpl>
> 
> Fixes: e0c827aca0730 ("drm/omap: Populate DSS children in omapdss driver")
> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>

Thanks applying this one into omap-for-v5.1/fixes.

Regards,

Tony

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Re: [PATCH 12/12] drivers: firmware: psci: add missing of_node_put after of_device_is_available

[Mukesh Ojha]

On 2/23/2019 6:50 PM, Julia Lawall wrote:
> Add an of_node_put when a tested device node is not available.
>
> The semantic patch that fixes this problem is as follows
> (http://Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>
>
> Cheers,
> -Mukesh.lip6.fr):
>
> // <smpl>
> @@
> identifier f;
> local idexpression e;
> expression x;
> @@
>
> e = f(...);
> ... when != of_node_put(e)
>      when != x = e
>      when != e = x
>      when any
> if (<+...of_device_is_available(e)...+>) {
>    ... when != of_node_put(e)
> (
>    return e;
> |
> + of_node_put(e);
>    return ...;
> )
> }
> // </smpl>
>
> Fixes: d09a0011ec0d5 ("drivers: psci: Allow PSCI node to be disabled")
> Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Reviewed-by: Mukesh Ojha <mojha@codeaurora.org>

Cheers,
-Mukesh
>
> ---
>   drivers/firmware/psci.c |    4 +++-
>   1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff -u -p a/drivers/firmware/psci.c b/drivers/firmware/psci.c
> --- a/drivers/firmware/psci.c
> +++ b/drivers/firmware/psci.c
> @@ -677,8 +677,10 @@ int __init psci_dt_init(void)
>   
>   	np = of_find_matching_node_and_match(NULL, psci_of_match, &matched_np);
>   
> -	if (!np || !of_device_is_available(np))
> +	if (!np || !of_device_is_available(np)) {
> +		of_node_put(np);
>   		return -ENODEV;
> +	}
>   
>   	init_fn = (psci_initcall_t)matched_np->data;
>   	return init_fn(np);
>
>
> _______________________________________________
> linux-arm-kernel mailing list
> linux-arm-kernel@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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Re: [PATCH 09/12] meson-gx-socinfo: add missing of_node_put after of_device_is_available

[Markus Elfring]

> @@ -123,8 +123,10 @@  static int __init meson_gx_socinfo_init(
>  		return -ENODEV;
>
>  	/* check if interface is enabled */
> -	if (!of_device_is_available(np))
> +	if (!of_device_is_available(np)) {
> +		of_node_put(np);
>  		return -ENODEV;
> +	}
>
>  	/* check if chip-id is available */
>  	if (!of_property_read_bool(np, "amlogic,has-chip-id"))

How do you think about to adjust the exception handling in this function
implementation a bit more according to the Linux coding style?

Regards,
Markus

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Re: [11/12] ARM: OMAP2+: add missing of_node_put after of_device_is_available

[Markus Elfring]

> @@ -250,8 +250,10 @@ static int __init omapdss_init_of(void)
>  	if (!node)
>  		return 0;
>
> -	if (!of_device_is_available(node))
> +	if (!of_device_is_available(node)) {
> +		of_node_put(node);
>  		return 0;
> +	}
>
>  	pdev = of_find_device_by_node(node);

Is there a need to put the node also in subsequent if branches
for complete exception handling in this function implementation?

Regards,
Markus

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Re: [11/12] ARM: OMAP2+: add missing of_node_put after of_device_is_available

[Julia Lawall]

On Sun, 14 Apr 2019, Markus Elfring wrote:

> > @@ -250,8 +250,10 @@ static int __init omapdss_init_of(void)
> >  	if (!node)
> >  		return 0;
> >
> > -	if (!of_device_is_available(node))
> > +	if (!of_device_is_available(node)) {
> > +		of_node_put(node);
> >  		return 0;
> > +	}
> >
> >  	pdev = of_find_device_by_node(node);
>
> Is there a need to put the node also in subsequent if branches
> for complete exception handling in this function implementation?

Yes, it looks like this is indeed missing.  I will try to send a better
patch when time permits.

julia

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