Hi Greg,
> On Apr 24, 2015, at 23:36 , Greg KH <greg@xxxxxxxxx> wrote:
>
> On Fri, Apr 24, 2015 at 12:45:42PM +0300, Pantelis Antoniou wrote:
>> A throw once master enable switch to protect against any
>> further overlay applications if the administrator desires so.
>>
>> Signed-off-by: Pantelis Antoniou <pantelis.antoniou@xxxxxxxxxxxx>
>> ---
>> drivers/of/overlay.c | 45 ++++++++++++++++++++++++++++++++++++++++++++-
>> 1 file changed, 44 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/of/overlay.c b/drivers/of/overlay.c
>> index f17f5ef..c335809 100644
>> --- a/drivers/of/overlay.c
>> +++ b/drivers/of/overlay.c
>> @@ -21,6 +21,7 @@
>> #include <linux/err.h>
>> #include <linux/idr.h>
>> #include <linux/sysfs.h>
>> +#include <linux/atomic.h>
>>
>> #include "of_private.h"
>>
>> @@ -55,8 +56,12 @@ struct of_overlay {
>> struct kobject kobj;
>> };
>>
>> +/* master enable switch; once set to 0 can't be re-enabled */
>> +static atomic_t ov_enable = ATOMIC_INIT(1);
>> +
>> static int of_overlay_apply_one(struct of_overlay *ov,
>> struct device_node *target, const struct device_node *overlay);
>> +static int overlay_removal_is_ok(struct of_overlay *ov);
>>
>> static int of_overlay_apply_single_property(struct of_overlay *ov,
>> struct device_node *target, struct property *prop)
>> @@ -339,6 +344,37 @@ void of_overlay_release(struct kobject *kobj)
>> kfree(ov);
>> }
>>
>> +static ssize_t enable_show(struct kobject *kobj,
>> + struct kobj_attribute *attr, char *buf)
>> +{
>> + return snprintf(buf, PAGE_SIZE, "%d\n", atomic_read(&ov_enable));
>> +}
>> +
>> +static ssize_t enable_store(struct kobject *kobj,
>> + struct kobj_attribute *attr, const char *buf, size_t count)
>> +{
>> + int ret;
>> + long new_enable;
>> +
>> + ret = kstrtol(buf, 10, &new_enable);
>
> strtobool()?
OK
Regards
— Pantelis
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