[SCSI] host state model update: mediate host add/remove race
Add support to not allow additions to a host when it is being removed.
Signed-off-by: Mike Anderson <andmike@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index 2d3c4ac4..076cbe3 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -1251,9 +1251,12 @@
get_device(&starget->dev);
down(&shost->scan_mutex);
- res = scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1, hostdata);
- if (res != SCSI_SCAN_LUN_PRESENT)
- sdev = ERR_PTR(-ENODEV);
+ if (scsi_host_scan_allowed(shost)) {
+ res = scsi_probe_and_add_lun(starget, lun, NULL, &sdev, 1,
+ hostdata);
+ if (res != SCSI_SCAN_LUN_PRESENT)
+ sdev = ERR_PTR(-ENODEV);
+ }
up(&shost->scan_mutex);
scsi_target_reap(starget);
put_device(&starget->dev);
@@ -1403,11 +1406,15 @@
return -EINVAL;
down(&shost->scan_mutex);
- if (channel == SCAN_WILD_CARD)
- for (channel = 0; channel <= shost->max_channel; channel++)
+ if (scsi_host_scan_allowed(shost)) {
+ if (channel == SCAN_WILD_CARD)
+ for (channel = 0; channel <= shost->max_channel;
+ channel++)
+ scsi_scan_channel(shost, channel, id, lun,
+ rescan);
+ else
scsi_scan_channel(shost, channel, id, lun, rescan);
- else
- scsi_scan_channel(shost, channel, id, lun, rescan);
+ }
up(&shost->scan_mutex);
return 0;