[SCSI] libsas: Warn if ATA device detected but CONFIG_SCSI_SAS_ATA not set

We give a very cryptic error if an ATA device is seen on a SAS port
but libsas isn't compiled to include libata to handle them.  Add an
extra warning to explain specifically what the problem is.

Acked-by: Darrick J. Wong <djwong@us.ibm.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/scsi/libsas/sas_discover.c b/drivers/scsi/libsas/sas_discover.c
index 31b9af224243..709a6f75ca9d 100644
--- a/drivers/scsi/libsas/sas_discover.c
+++ b/drivers/scsi/libsas/sas_discover.c
@@ -295,11 +295,14 @@ static void sas_discover_domain(struct work_struct *work)
         case FANOUT_DEV:
                 error = sas_discover_root_expander(dev);
                 break;
-#ifdef CONFIG_SCSI_SAS_ATA
         case SATA_DEV:
         case SATA_PM:
+#ifdef CONFIG_SCSI_SAS_ATA
                 error = sas_discover_sata(dev);
                 break;
+#else
+                SAS_DPRINTK("ATA device seen but CONFIG_SCSI_SAS_ATA=N so cannot attach\n");
+                /* Fall through */
 #endif
         default:
                 error = -ENXIO;