On Fri, Sep 5, 2014 at 4:32 AM, Gaurav Minocha
<gaurav.minocha.os@xxxxxxxxx> wrote:
> This patch is to the fix the recent runtime bug in kernel
> reported by <fengguang.wu@xxxxxxxxx>
>
> Mail Subject: [OF test] BUG: unable to handle kernel NULL
> pointer dereference at 00000038
>
> Tested on x86 and arm architecture
>
> Signed-off-by: Gaurav Minocha <gaurav.minocha.os@xxxxxxxxx>
> ---
> drivers/of/base.c | 29 +++++++++++++++++++++++++++++
> drivers/of/dynamic.c | 7 +++++++
> 2 files changed, 36 insertions(+)
>
> diff --git a/drivers/of/base.c b/drivers/of/base.c
> index d8574ad..1d4d74e 100644
> --- a/drivers/of/base.c
> +++ b/drivers/of/base.c
> @@ -131,6 +131,7 @@ static const char *safe_name(struct kobject *kobj, const char *orig_name)
> return name;
> }
>
> +#if defined(CONFIG_SYSFS)
> int __of_add_property_sysfs(struct device_node *np, struct property *pp)
> {
> int rc;
Instead of ifdef, you can do:
if (!IS_ENABLED(CONFIG_SYSFS)
return 0;
> @@ -151,7 +152,14 @@ int __of_add_property_sysfs(struct device_node *np, struct property *pp)
> WARN(rc, "error adding attribute %s to node %s\n", pp->name, np->full_name);
> return rc;
> }
> +#else
> +int __of_add_property_sysfs(struct device_node *np, struct property *pp)
> +{
> + return 0;
> +}
> +#endif
>
> +#if defined(CONFIG_SYSFS)
> int __of_attach_node_sysfs(struct device_node *np)
> {
> const char *name;
> @@ -181,6 +189,12 @@ int __of_attach_node_sysfs(struct device_node *np)
>
> return 0;
> }
> +#else
> +int __of_attach_node_sysfs(struct device_node *np)
> +{
> + return 0;
> +}
> +#endif
>
> static int __init of_init(void)
> {
> @@ -1711,12 +1725,19 @@ int __of_remove_property(struct device_node *np, struct property *prop)
> return 0;
> }
>
> +#if defined(CONFIG_SYSFS)
> void __of_remove_property_sysfs(struct device_node *np, struct property *prop)
> {
> /* at early boot, bail here and defer setup to of_init() */
> if (of_kset && of_node_is_attached(np))
> sysfs_remove_bin_file(&np->kobj, &prop->attr);
> }
> +#else
> +void __of_remove_property_sysfs(struct device_node *np, struct property *prop)
> +{
> +
> +}
> +#endif
>
> /**
> * of_remove_property - Remove a property from a node.
> @@ -1774,6 +1795,7 @@ int __of_update_property(struct device_node *np, struct property *newprop,
> return 0;
> }
>
> +#if defined(CONFIG_SYSFS)
> void __of_update_property_sysfs(struct device_node *np, struct property *newprop,
> struct property *oldprop)
> {
> @@ -1785,6 +1807,13 @@ void __of_update_property_sysfs(struct device_node *np, struct property *newprop
> sysfs_remove_bin_file(&np->kobj, &oldprop->attr);
> __of_add_property_sysfs(np, newprop);
> }
> +#else
> +void __of_update_property_sysfs(struct device_node *np, struct property *newprop,
> + struct property *oldprop)
> +{
> +
> +}
> +#endif
>
> /*
> * of_update_property - Update a property in a node, if the property does
> diff --git a/drivers/of/dynamic.c b/drivers/of/dynamic.c
> index 54fecc4..c3d9eae 100644
> --- a/drivers/of/dynamic.c
> +++ b/drivers/of/dynamic.c
> @@ -41,6 +41,7 @@ void of_node_put(struct device_node *node)
> }
> EXPORT_SYMBOL(of_node_put);
>
> +#if defined(CONFIG_SYSFS)
> void __of_detach_node_sysfs(struct device_node *np)
> {
> struct property *pp;
> @@ -59,6 +60,12 @@ void __of_detach_node_sysfs(struct device_node *np)
> /* finally remove the kobj_init ref */
> of_node_put(np);
> }
> +#else
> +void __of_detach_node_sysfs(struct device_node *np)
> +{
> +
> +}
> +#endif
>
> static BLOCKING_NOTIFIER_HEAD(of_reconfig_chain);
>
> --
> 1.7.9.5
>
> --
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