Commit f6023188 authored by Corey Minyard's avatar Corey Minyard
Browse files

ipmi: Add a sysfs interface to view the number of users 



A count of users is kept for each interface, allow it to be viewed.

Based on work by Chen Guanqiao <chen.chenchacha@foxmail.com>

Cc: Chen Guanqiao <chen.chenchacha@foxmail.com>
Signed-off-by: default avatarCorey Minyard <cminyard@mvista.com>
parent 333730e4

drivers/char/ipmi/ipmi_msghandler.c

+21 −0
Original line number Original line Diff line number Diff line
@@ -457,6 +457,8 @@ struct ipmi_smi { 
	struct list_head users;

	struct list_head users;

	struct srcu_struct users_srcu;

	struct srcu_struct users_srcu;

	atomic_t nr_users;

	atomic_t nr_users;

	struct device_attribute nr_users_devattr;







	/* Used for wake ups at startup. */

	/* Used for wake ups at startup. */

	wait_queue_head_t waitq;

	wait_queue_head_t waitq;
@@ -3506,6 +3508,17 @@ void ipmi_poll_interface(struct ipmi_user *user) 
}

}

EXPORT_SYMBOL(ipmi_poll_interface);

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)

static void redo_bmc_reg(struct work_struct *work)

{

{

	struct ipmi_smi *intf = container_of(work, struct ipmi_smi,

	struct ipmi_smi *intf = container_of(work, struct ipmi_smi,
@@ -3628,6 +3641,12 @@ int ipmi_add_smi(struct module *owner, 
	if (rv)

	if (rv)

		goto out_err_bmc_reg;

		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

	 * Keep memory order straight for RCU readers.  Make

	 * sure everything else is committed to memory before

	 * sure everything else is committed to memory before
@@ -3727,6 +3746,8 @@ void ipmi_unregister_smi(struct ipmi_smi *intf) 




	/* At this point no users can be added to the interface. */

	/* 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

	 * Call all the watcher interfaces to tell them that

	 * an interface is going away.

	 * an interface is going away.