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path: root/drivers/s390/scsi/zfcp_sysfs.c
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Diffstat (limited to 'drivers/s390/scsi/zfcp_sysfs.c')
-rw-r--r--drivers/s390/scsi/zfcp_sysfs.c18
1 files changed, 16 insertions, 2 deletions
diff --git a/drivers/s390/scsi/zfcp_sysfs.c b/drivers/s390/scsi/zfcp_sysfs.c
index c66af27b230b..1e0eb089dfba 100644
--- a/drivers/s390/scsi/zfcp_sysfs.c
+++ b/drivers/s390/scsi/zfcp_sysfs.c
@@ -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;
}