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mei: revamp me clients list handling

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1. Use rw lock to access the me_clients list

2. Reuse already defined find functions also when
removing particular me client

3. Add wrappers for addition  and deletion

Signed-off-by: Tomas Winkler <tomas.winkler@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Tomas Winkler
2015-02-10 10:39:31 +02:00
committed by Greg Kroah-Hartman
parent e9395e3f89
commit b7d8851455
6 changed files with 164 additions and 64 deletions
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19
drivers/misc/mei/debugfs.c
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@@ -28,7 +28,7 @@ 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, *n;
struct mei_me_client *me_cl;
size_t bufsz = 1;
char *buf;
int i = 0;
@@ -38,15 +38,14 @@ static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf,
#define HDR \
" |id|fix| UUID |con|msg len|sb|refc|\n"
mutex_lock(&dev->device_lock);
down_read(&dev->me_clients_rwsem);
list_for_each_entry(me_cl, &dev->me_clients, list)
bufsz++;
bufsz *= sizeof(HDR) + 1;
buf = kzalloc(bufsz, GFP_KERNEL);
if (!buf) {
mutex_unlock(&dev->device_lock);
up_read(&dev->me_clients_rwsem);
return -ENOMEM;
}
@@ -56,10 +55,9 @@ static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf,
if (dev->dev_state != MEI_DEV_ENABLED)
goto out;
list_for_each_entry_safe(me_cl, n, &dev->me_clients, list) {
list_for_each_entry(me_cl, &dev->me_clients, list) {
me_cl = mei_me_cl_get(me_cl);
if (me_cl) {
if (mei_me_cl_get(me_cl)) {
pos += scnprintf(buf + pos, bufsz - pos,
"%2d|%2d|%3d|%pUl|%3d|%7d|%2d|%4d|\n",
i++, me_cl->client_id,
@@ -69,12 +67,13 @@ static ssize_t mei_dbgfs_read_meclients(struct file *fp, char __user *ubuf,
me_cl->props.max_msg_length,
me_cl->props.single_recv_buf,
atomic_read(&me_cl->refcnt.refcount));
}
mei_me_cl_put(me_cl);
mei_me_cl_put(me_cl);
}
}
out:
mutex_unlock(&dev->device_lock);
up_read(&dev->me_clients_rwsem);
ret = simple_read_from_buffer(ubuf, cnt, ppos, buf, pos);
kfree(buf);
return ret;