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[IB] Fail sysfs queries after device is unregistered

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We keep IB device structures around until the last sysfs reference is
gone, but we shouldn't ask the low-level driver to do anything after
the LLD unregisters the device.  To handle this, check the reg_state
field and just fail sysfs show() requests if the device has already
been unregistered.

Signed-off-by: Roland Dreier <rolandd@cisco.com>
This commit is contained in:
Roland Dreier 2005-10-18 14:14:56 -07:00
parent d476306f1c
commit ba8e931024
1 changed files with 16 additions and 0 deletions
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16
drivers/infiniband/core/sysfs.c
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@ -65,6 +65,11 @@ struct port_table_attribute {
int index;
};
static inline int ibdev_is_alive(const struct ib_device *dev)
{
return dev->reg_state == IB_DEV_REGISTERED;
}
static ssize_t port_attr_show(struct kobject *kobj,
struct attribute *attr, char *buf)
{
@ -74,6 +79,8 @@ static ssize_t port_attr_show(struct kobject *kobj,
if (!port_attr->show)
return -EIO;
if (!ibdev_is_alive(p->ibdev))
return -ENODEV;
return port_attr->show(p, port_attr, buf);
}
@ -581,6 +588,9 @@ static ssize_t show_node_type(struct class_device *cdev, char *buf)
{
struct ib_device *dev = container_of(cdev, struct ib_device, class_dev);
if (!ibdev_is_alive(dev))
return -ENODEV;
switch (dev->node_type) {
case IB_NODE_CA: return sprintf(buf, "%d: CA\n", dev->node_type);
case IB_NODE_SWITCH: return sprintf(buf, "%d: switch\n", dev->node_type);
@ -595,6 +605,9 @@ static ssize_t show_sys_image_guid(struct class_device *cdev, char *buf)
struct ib_device_attr attr;
ssize_t ret;
if (!ibdev_is_alive(dev))
return -ENODEV;
ret = ib_query_device(dev, &attr);
if (ret)
return ret;
@ -612,6 +625,9 @@ static ssize_t show_node_guid(struct class_device *cdev, char *buf)
struct ib_device_attr attr;
ssize_t ret;
if (!ibdev_is_alive(dev))
return -ENODEV;
ret = ib_query_device(dev, &attr);
if (ret)
return ret;