From: Corey Minyard <[email protected]>
A count of users is kept for each interface, allow it to be viewed.
Based on work by Chen Guanqiao <[email protected]>
Cc: Chen Guanqiao <[email protected]>
Signed-off-by: Corey Minyard <[email protected]>
---
drivers/char/ipmi/ipmi_msghandler.c | 21 +++++++++++++++++++++
1 file changed, 21 insertions(+)
diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index 2a05199e8224..3ba188e05ca6 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -457,6 +457,8 @@ struct ipmi_smi {
struct list_head users;
struct srcu_struct users_srcu;
atomic_t nr_users;
+ struct device_attribute nr_users_devattr;
+
/* Used for wake ups at startup. */
wait_queue_head_t waitq;
@@ -3506,6 +3508,17 @@ void ipmi_poll_interface(struct ipmi_user *user)
}
EXPORT_SYMBOL(ipmi_poll_interface);
+static ssize_t nr_users_show(struct device *dev,
+ struct device_attribute *attr,
+ char *buf)
+{
+ struct ipmi_smi *intf = container_of(attr,
+ struct ipmi_smi, nr_users_devattr);
+
+ return sysfs_emit(buf, "%d\n", atomic_read(&intf->nr_users));
+}
+static DEVICE_ATTR_RO(nr_users);
+
static void redo_bmc_reg(struct work_struct *work)
{
struct ipmi_smi *intf = container_of(work, struct ipmi_smi,
@@ -3628,6 +3641,12 @@ int ipmi_add_smi(struct module *owner,
if (rv)
goto out_err_bmc_reg;
+ intf->nr_users_devattr = dev_attr_nr_users;
+ sysfs_attr_init(&intf->nr_users_devattr.attr);
+ rv = device_create_file(intf->si_dev, &intf->nr_users_devattr);
+ if (rv)
+ goto out_err_bmc_reg;
+
/*
* Keep memory order straight for RCU readers. Make
* sure everything else is committed to memory before
@@ -3724,6 +3743,8 @@ void ipmi_unregister_smi(struct ipmi_smi *intf)
/* At this point no users can be added to the interface. */
+ device_remove_file(intf->si_dev, &intf->nr_users_devattr);
+
/*
* Call all the watcher interfaces to tell them that
* an interface is going away.
--
2.25.1