[SCSI] Fix scsi_add_device() for async scanning

I had thought that all drivers which didn't call scsi_scan_host()
called scsi_scan_target().  Some, such as sbp2, mptsas and libata-scsi,
call scsi_add_device() or __scsi_add_device().  We just need to wait
for the currently executing async scans to complete first.  This is the
same code that's in scsi_scan_target(), except that we have to return
an error instead of void when we're declining to scan at all.

Signed-off-by: Matthew Wilcox <matthew@wil.cx>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/drivers/scsi/scsi_scan.c b/drivers/scsi/scsi_scan.c
index b83d03c4deef..96b7cbd746a8 100644
--- a/drivers/scsi/scsi_scan.c
+++ b/drivers/scsi/scsi_scan.c
@@ -1453,6 +1453,12 @@ struct scsi_device *__scsi_add_device(struct Scsi_Host *shost, uint channel,
         struct device *parent = &shost->shost_gendev;
         struct scsi_target *starget;
 
+        if (strncmp(scsi_scan_type, "none", 4) == 0)
+                return ERR_PTR(-ENODEV);
+
+        if (!shost->async_scan)
+                scsi_complete_async_scans();
+
         starget = scsi_alloc_target(parent, channel, id);
         if (!starget)
                 return ERR_PTR(-ENOMEM);