ses: add reliable slot attribute
The name provided by firmware is in a vendor specific format, publish
the slot number to have a reliable mechanism for identifying slots
across firmware implementations. If the enclosure does not provide a
slot number fallback to the component number which is guaranteed unique,
and usually mirrors the slot number.
Cleaned up the unused ses_component.desc in the process.
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Song Liu <songliubraving@fb.com>
Reviewed-by: Jens Axboe <axboe@fb.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
Signed-off-by: Christoph Hellwig <hch@lst.de>
diff --git a/drivers/misc/enclosure.c b/drivers/misc/enclosure.c
index 958ee98..b62314d 100644
--- a/drivers/misc/enclosure.c
+++ b/drivers/misc/enclosure.c
@@ -145,8 +145,10 @@
if (err)
goto err;
- for (i = 0; i < components; i++)
+ for (i = 0; i < components; i++) {
edev->component[i].number = -1;
+ edev->component[i].slot = -1;
+ }
mutex_lock(&container_list_lock);
list_add_tail(&edev->node, &container_list);
@@ -589,6 +591,20 @@
return snprintf(buf, 40, "%s\n", enclosure_type[ecomp->type]);
}
+static ssize_t get_component_slot(struct device *cdev,
+ struct device_attribute *attr, char *buf)
+{
+ struct enclosure_component *ecomp = to_enclosure_component(cdev);
+ int slot;
+
+ /* if the enclosure does not override then use 'number' as a stand-in */
+ if (ecomp->slot >= 0)
+ slot = ecomp->slot;
+ else
+ slot = ecomp->number;
+
+ return snprintf(buf, 40, "%d\n", slot);
+}
static DEVICE_ATTR(fault, S_IRUGO | S_IWUSR, get_component_fault,
set_component_fault);
@@ -599,6 +615,7 @@
static DEVICE_ATTR(locate, S_IRUGO | S_IWUSR, get_component_locate,
set_component_locate);
static DEVICE_ATTR(type, S_IRUGO, get_component_type, NULL);
+static DEVICE_ATTR(slot, S_IRUGO, get_component_slot, NULL);
static struct attribute *enclosure_component_attrs[] = {
&dev_attr_fault.attr,
@@ -606,6 +623,7 @@
&dev_attr_active.attr,
&dev_attr_locate.attr,
&dev_attr_type.attr,
+ &dev_attr_slot.attr,
NULL
};
ATTRIBUTE_GROUPS(enclosure_component);