diff options
| author | Sebastian Ott <sebott@linux.vnet.ibm.com> | 2013-12-16 13:56:46 +0400 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2013-12-16 17:38:03 +0400 |
| commit | d5b877ffb9aa04a6fb6b6eae6dc19ca163d568a8 (patch) | |
| tree | eedc56fb461873c5697fe450f60e0497316ef670 /drivers/s390 | |
| parent | 00381eeb47ef6b3b70d2a17c89a8205b6f1aa00a (diff) | |
| download | linux-d5b877ffb9aa04a6fb6b6eae6dc19ca163d568a8.tar.xz | |
s390/cio: use device_lock to synchronize calls to the ccwgroup driver
When calling set_{on,off}line of a ccwgroup device driver we hold
the module reference of the owner. This is pretty useless - we don't
want to prevent module unloading but driver unbinding. Use the
driver core's device_lock instead.
Reviewed-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390')
| -rw-r--r-- | drivers/s390/cio/ccwgroup.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/s390/cio/ccwgroup.c b/drivers/s390/cio/ccwgroup.c index 959135a01847..fd3367a1dc7a 100644 --- a/drivers/s390/cio/ccwgroup.c +++ b/drivers/s390/cio/ccwgroup.c @@ -128,14 +128,14 @@ static ssize_t ccwgroup_online_store(struct device *dev, const char *buf, size_t count) { struct ccwgroup_device *gdev = to_ccwgroupdev(dev); - struct ccwgroup_driver *gdrv = to_ccwgroupdrv(dev->driver); unsigned long value; int ret; - if (!dev->driver) - return -EINVAL; - if (!try_module_get(gdrv->driver.owner)) - return -EINVAL; + device_lock(dev); + if (!dev->driver) { + ret = -EINVAL; + goto out; + } ret = kstrtoul(buf, 0, &value); if (ret) @@ -148,7 +148,7 @@ static ssize_t ccwgroup_online_store(struct device *dev, else ret = -EINVAL; out: - module_put(gdrv->driver.owner); + device_unlock(dev); return (ret == 0) ? count : ret; } |