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[SCSI] hpsa: update device attributes when they change 

Certain types of changes to devices should not be interpreted as a device
change that would cause the device to be removed and re-added.  These include
RAID level and Firmware revision changes.  However, these attribute changes DO
need to be reflected in the controller info structure's dev structure list, so
that sysfs and /proc info files for the devices will reflect the new values.

Signed-off-by: Scott Teel <scott.stacy.teel@hp.com>
Acked-by: Stephen M. Cameron <scameron@beardog.cce.hp.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
This commit is contained in:
Scott Teel 2012-01-19 14:01:30 -06:00 committed by James Bottomley
parent 4f4eb9f1d8
commit bd9244f7b9
1 changed files with 40 additions and 3 deletions
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43
drivers/scsi/hpsa.c
View File

@ -677,6 +677,20 @@ static int hpsa_scsi_add_entry(struct ctlr_info *h, int hostno,
return 0;
}
/* Update an entry in h->dev[] array. */
static void hpsa_scsi_update_entry(struct ctlr_info *h, int hostno,
int entry, struct hpsa_scsi_dev_t *new_entry)
{
/* assumes h->devlock is held */
BUG_ON(entry < 0 || entry >= HPSA_MAX_DEVICES);
/* Raid level changed. */
h->dev[entry]->raid_level = new_entry->raid_level;
dev_info(&h->pdev->dev, "%s device c%db%dt%dl%d updated.\n",
scsi_device_type(new_entry->devtype), hostno, new_entry->bus,
new_entry->target, new_entry->lun);
}
/* Replace an entry from h->dev[] array. */
static void hpsa_scsi_replace_entry(struct ctlr_info *h, int hostno,
int entry, struct hpsa_scsi_dev_t *new_entry,
@ -783,10 +797,25 @@ static inline int device_is_the_same(struct hpsa_scsi_dev_t *dev1,
return 1;
}
static inline int device_updated(struct hpsa_scsi_dev_t *dev1,
struct hpsa_scsi_dev_t *dev2)
{
/* Device attributes that can change, but don't mean
* that the device is a different device, nor that the OS
* needs to be told anything about the change.
*/
if (dev1->raid_level != dev2->raid_level)
return 1;
return 0;
}
/* Find needle in haystack. If exact match found, return DEVICE_SAME,
* and return needle location in *index. If scsi3addr matches, but not
* vendor, model, serial num, etc. return DEVICE_CHANGED, and return needle
* location in *index. If needle not found, return DEVICE_NOT_FOUND.
* location in *index.
* In the case of a minor device attribute change, such as RAID level, just
* return DEVICE_UPDATED, along with the updated device's location in index.
* If needle not found, return DEVICE_NOT_FOUND.
*/
static int hpsa_scsi_find_entry(struct hpsa_scsi_dev_t *needle,
struct hpsa_scsi_dev_t *haystack[], int haystack_size,
@ -796,15 +825,19 @@ static int hpsa_scsi_find_entry(struct hpsa_scsi_dev_t *needle,
#define DEVICE_NOT_FOUND 0
#define DEVICE_CHANGED 1
#define DEVICE_SAME 2
#define DEVICE_UPDATED 3
for (i = 0; i < haystack_size; i++) {
if (haystack[i] == NULL) /* previously removed. */
continue;
if (SCSI3ADDR_EQ(needle->scsi3addr, haystack[i]->scsi3addr)) {
*index = i;
if (device_is_the_same(needle, haystack[i]))
if (device_is_the_same(needle, haystack[i])) {
if (device_updated(needle, haystack[i]))
return DEVICE_UPDATED;
return DEVICE_SAME;
else
} else {
return DEVICE_CHANGED;
}
}
}
*index = -1;
@ -840,6 +873,8 @@ static void adjust_hpsa_scsi_table(struct ctlr_info *h, int hostno,
* sd[] and remove them from h->dev[], and for any
* devices which have changed, remove the old device
* info and add the new device info.
* If minor device attributes change, just update
* the existing device structure.
*/
i = 0;
nremoved = 0;
@ -860,6 +895,8 @@ static void adjust_hpsa_scsi_table(struct ctlr_info *h, int hostno,
* at the bottom of hpsa_update_scsi_devices()
*/
sd[entry] = NULL;
} else if (device_change == DEVICE_UPDATED) {
hpsa_scsi_update_entry(h, hostno, i, sd[entry]);
}
i++;
}