[SCSI] sd: Detach DIF from block integrity infrastructure

So far we have only issued DIF commands if CONFIG_BLK_DEV_INTEGRITY is
enabled.  However, communication between initiator and target should be
independent of protection information DMA.  There are DIF-only host
adapters coming out that will be able to take advantage of this.

Move the relevant DIF bits to sd.c.

Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

1 files changed, 11 insertions, 4 deletions

diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index b62a097b3ecb..6e728b176904 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -798,9 +798,15 @@ static inline unsigned int scsi_host_get_prot(struct Scsi_Host *shost)
 static inline unsigned int scsi_host_dif_capable(struct Scsi_Host *shost, unsigned int target_type)
 {
         switch (target_type) {
-        case 1: return shost->prot_capabilities & SHOST_DIF_TYPE1_PROTECTION;
-        case 2: return shost->prot_capabilities & SHOST_DIF_TYPE2_PROTECTION;
-        case 3: return shost->prot_capabilities & SHOST_DIF_TYPE3_PROTECTION;
+        case 1:
+                if (shost->prot_capabilities & SHOST_DIF_TYPE1_PROTECTION)
+                        return target_type;
+        case 2:
+                if (shost->prot_capabilities & SHOST_DIF_TYPE2_PROTECTION)
+                        return target_type;
+        case 3:
+                if (shost->prot_capabilities & SHOST_DIF_TYPE3_PROTECTION)
+                        return target_type;
         }
 
         return 0;
@@ -808,13 +814,14 @@ static inline unsigned int scsi_host_dif_capable(struct Scsi_Host *shost, unsign
 
 static inline unsigned int scsi_host_dix_capable(struct Scsi_Host *shost, unsigned int target_type)
 {
+#if defined(CONFIG_BLK_DEV_INTEGRITY)
         switch (target_type) {
         case 0: return shost->prot_capabilities & SHOST_DIX_TYPE0_PROTECTION;
         case 1: return shost->prot_capabilities & SHOST_DIX_TYPE1_PROTECTION;
         case 2: return shost->prot_capabilities & SHOST_DIX_TYPE2_PROTECTION;
         case 3: return shost->prot_capabilities & SHOST_DIX_TYPE3_PROTECTION;
         }
-
+#endif
         return 0;
 }