Commit d99b601b authored by Steffen Maier's avatar Steffen Maier Committed by James Bottomley
Browse files

[SCSI] zfcp: restore refcount check on port_remove

Upstream commit f3450c7b


"[SCSI] zfcp: Replace local reference counting with common kref"
accidentally dropped a reference count check before tearing down
zfcp_ports that are potentially in use by zfcp_units.
Even remote ports in use can be removed causing
unreachable garbage objects zfcp_ports with zfcp_units.
Thus units won't come back even after a manual port_rescan.
The kref of zfcp_port->dev.kobj is already used by the driver core.
We cannot re-use it to track the number of zfcp_units.
Re-introduce our own counter for units per port
and check on port_remove.
Signed-off-by: default avatarSteffen Maier <maier@linux.vnet.ibm.com>
Reviewed-by: default avatarHeiko Carstens <heiko.carstens@de.ibm.com>
Cc: <stable@vger.kernel.org> #2.6.33+
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent ca579c9f
......@@ -519,6 +519,7 @@ struct zfcp_port *zfcp_port_enqueue(struct zfcp_adapter *adapter, u64 wwpn,
rwlock_init(&port->unit_list_lock);
INIT_LIST_HEAD(&port->unit_list);
atomic_set(&port->units, 0);
INIT_WORK(&port->gid_pn_work, zfcp_fc_port_did_lookup);
INIT_WORK(&port->test_link_work, zfcp_fc_link_test_work);
......
......@@ -205,6 +205,7 @@ struct zfcp_port {
struct zfcp_adapter *adapter; /* adapter used to access port */
struct list_head unit_list; /* head of logical unit list */
rwlock_t unit_list_lock; /* unit list lock */
atomic_t units; /* zfcp_unit count */
atomic_t status; /* status of this remote port */
u64 wwnn; /* WWNN if known */
u64 wwpn; /* WWPN */
......
......@@ -159,6 +159,7 @@ extern void zfcp_scsi_dif_sense_error(struct scsi_cmnd *, int);
extern struct attribute_group zfcp_sysfs_unit_attrs;
extern struct attribute_group zfcp_sysfs_adapter_attrs;
extern struct attribute_group zfcp_sysfs_port_attrs;
extern struct mutex zfcp_sysfs_port_units_mutex;
extern struct device_attribute *zfcp_sysfs_sdev_attrs[];
extern struct device_attribute *zfcp_sysfs_shost_attrs[];
......
......@@ -227,6 +227,8 @@ static ssize_t zfcp_sysfs_port_rescan_store(struct device *dev,
static ZFCP_DEV_ATTR(adapter, port_rescan, S_IWUSR, NULL,
zfcp_sysfs_port_rescan_store);
DEFINE_MUTEX(zfcp_sysfs_port_units_mutex);
static ssize_t zfcp_sysfs_port_remove_store(struct device *dev,
struct device_attribute *attr,
const char *buf, size_t count)
......@@ -249,6 +251,16 @@ static ssize_t zfcp_sysfs_port_remove_store(struct device *dev,
else
retval = 0;
mutex_lock(&zfcp_sysfs_port_units_mutex);
if (atomic_read(&port->units) > 0) {
retval = -EBUSY;
mutex_unlock(&zfcp_sysfs_port_units_mutex);
goto out;
}
/* port is about to be removed, so no more unit_add */
atomic_set(&port->units, -1);
mutex_unlock(&zfcp_sysfs_port_units_mutex);
write_lock_irq(&adapter->port_list_lock);
list_del(&port->list);
write_unlock_irq(&adapter->port_list_lock);
......@@ -289,12 +301,14 @@ static ssize_t zfcp_sysfs_unit_add_store(struct device *dev,
{
struct zfcp_port *port = container_of(dev, struct zfcp_port, dev);
u64 fcp_lun;
int retval;
if (strict_strtoull(buf, 0, (unsigned long long *) &fcp_lun))
return -EINVAL;
if (zfcp_unit_add(port, fcp_lun))
return -EINVAL;
retval = zfcp_unit_add(port, fcp_lun);
if (retval)
return retval;
return count;
}
......
......@@ -104,7 +104,7 @@ static void zfcp_unit_release(struct device *dev)
{
struct zfcp_unit *unit = container_of(dev, struct zfcp_unit, dev);
put_device(&unit->port->dev);
atomic_dec(&unit->port->units);
kfree(unit);
}
......@@ -119,16 +119,27 @@ static void zfcp_unit_release(struct device *dev)
int zfcp_unit_add(struct zfcp_port *port, u64 fcp_lun)
{
struct zfcp_unit *unit;
int retval = 0;
mutex_lock(&zfcp_sysfs_port_units_mutex);
if (atomic_read(&port->units) == -1) {
/* port is already gone */
retval = -ENODEV;
goto out;
}
unit = zfcp_unit_find(port, fcp_lun);
if (unit) {
put_device(&unit->dev);
return -EEXIST;
retval = -EEXIST;
goto out;
}
unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL);
if (!unit)
return -ENOMEM;
if (!unit) {
retval = -ENOMEM;
goto out;
}
unit->port = port;
unit->fcp_lun = fcp_lun;
......@@ -139,28 +150,33 @@ int zfcp_unit_add(struct zfcp_port *port, u64 fcp_lun)
if (dev_set_name(&unit->dev, "0x%016llx",
(unsigned long long) fcp_lun)) {
kfree(unit);
return -ENOMEM;
retval = -ENOMEM;
goto out;
}
get_device(&port->dev);
if (device_register(&unit->dev)) {
put_device(&unit->dev);
return -ENOMEM;
retval = -ENOMEM;
goto out;
}
if (sysfs_create_group(&unit->dev.kobj, &zfcp_sysfs_unit_attrs)) {
device_unregister(&unit->dev);
return -EINVAL;
retval = -EINVAL;
goto out;
}
atomic_inc(&port->units); /* under zfcp_sysfs_port_units_mutex ! */
write_lock_irq(&port->unit_list_lock);
list_add_tail(&unit->list, &port->unit_list);
write_unlock_irq(&port->unit_list_lock);
zfcp_unit_scsi_scan(unit);
return 0;
out:
mutex_unlock(&zfcp_sysfs_port_units_mutex);
return retval;
}
/**
......
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