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| author | Corey Minyard <cminyard@mvista.com> | 2022-03-29 08:31:36 -0500 |
|---|---|---|
| committer | Corey Minyard <cminyard@mvista.com> | 2022-05-12 10:00:03 -0500 |
| commit | f60231885fa986fcd5503f4eb9ef3e53a2002b12 (patch) | |
| tree | 2e81a541ff6b96ed3ba154e5e2379b47efc79f1f | |
| parent | 333730e456fa67eaf6032c6371936fd4aca6cc62 (diff) | |
| download | linux-f60231885fa986fcd5503f4eb9ef3e53a2002b12.tar.gz linux-f60231885fa986fcd5503f4eb9ef3e53a2002b12.tar.bz2 linux-f60231885fa986fcd5503f4eb9ef3e53a2002b12.zip | |
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: Corey Minyard <cminyard@mvista.com>
| -rw-r--r-- | drivers/char/ipmi/ipmi_msghandler.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c index 65a9e2629af1..8b5d39793997 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 @@ -3727,6 +3746,8 @@ 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. |