mei: add reference counting for me clients
To support dynamic addition and removal of
me clients we add reference counter.
Update kdoc with locking requirements.
Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/misc/mei/debugfs.c b/drivers/misc/mei/debugfs.c
index b60b426..b125380 100644
--- a/drivers/misc/mei/debugfs.c
+++ b/drivers/misc/mei/debugfs.c
@@ -21,20 +21,22 @@
#include <linux/mei.h>
#include "mei_dev.h"
+#include "client.h"
#include "hw.h"
static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf,
size_t cnt, loff_t *ppos)
{
struct mei_device *dev = fp->private_data;
- struct mei_me_client *me_cl;
+ struct mei_me_client *me_cl, *n;
size_t bufsz = 1;
char *buf;
int i = 0;
int pos = 0;
int ret;
-#define HDR " |id|fix| UUID |con|msg len|sb|\n"
+#define HDR \
+" |id|fix| UUID |con|msg len|sb|refc|\n"
mutex_lock(&dev->device_lock);
@@ -54,16 +56,22 @@
if (dev->dev_state != MEI_DEV_ENABLED)
goto out;
- list_for_each_entry(me_cl, &dev->me_clients, list) {
+ list_for_each_entry_safe(me_cl, n, &dev->me_clients, list) {
- pos += scnprintf(buf + pos, bufsz - pos,
- "%2d|%2d|%3d|%pUl|%3d|%7d|%2d|\n",
- i++, me_cl->client_id,
- me_cl->props.fixed_address,
- &me_cl->props.protocol_name,
- me_cl->props.max_number_of_connections,
- me_cl->props.max_msg_length,
- me_cl->props.single_recv_buf);
+ me_cl = mei_me_cl_get(me_cl);
+ if (me_cl) {
+ pos += scnprintf(buf + pos, bufsz - pos,
+ "%2d|%2d|%3d|%pUl|%3d|%7d|%2d|%4d|\n",
+ i++, me_cl->client_id,
+ me_cl->props.fixed_address,
+ &me_cl->props.protocol_name,
+ me_cl->props.max_number_of_connections,
+ me_cl->props.max_msg_length,
+ me_cl->props.single_recv_buf,
+ atomic_read(&me_cl->refcnt.refcount));
+ }
+
+ mei_me_cl_put(me_cl);
}
out:
mutex_unlock(&dev->device_lock);