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Add /sys/kernel/wait_for_device_probe attribute. #11

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merged 1 commit into from
Aug 18, 2021
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Add /sys/kernel/wait_for_device_probe attribute. #11

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18 changes: 18 additions & 0 deletions kernel/ksysfs.c
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Original file line number Diff line number Diff line change
Expand Up @@ -19,6 +19,7 @@
#include <linux/compiler.h>

#include <linux/rcupdate.h> /* rcu_expedited and rcu_normal */
#include <linux/device/driver.h> /* wait_for_device_probe */

#define KERNEL_ATTR_RO(_name) \
static struct kobj_attribute _name##_attr = __ATTR_RO(_name)
Expand Down Expand Up @@ -182,6 +183,22 @@ static ssize_t rcu_normal_store(struct kobject *kobj,
KERNEL_ATTR_RW(rcu_normal);
#endif /* #ifndef CONFIG_TINY_RCU */

static ssize_t wait_for_device_probe_show(struct kobject *kobj,
struct kobj_attribute *attr,
char *buf)
{
return sprintf(buf, "0\n");
}
static ssize_t wait_for_device_probe_store(struct kobject *kobj,
struct kobj_attribute *attr,
const char *buf, size_t count)
{
wait_for_device_probe();

return count;
}
KERNEL_ATTR_RW(wait_for_device_probe);

/*
* Make /sys/kernel/notes give the raw contents of our kernel .notes section.
*/
Expand Down Expand Up @@ -229,6 +246,7 @@ static struct attribute * kernel_attrs[] = {
&rcu_expedited_attr.attr,
&rcu_normal_attr.attr,
#endif
&wait_for_device_probe_attr.attr,
NULL
};

Expand Down