From: Martin K. Petersen <martin.petersen@oracle.com>
Date: Fri, 30 Oct 2009 02:32:26 +0000 (-0400)
Subject: [SCSI] Fix incorrect reporting of host protection capabilities
X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b2b465e9280b739a528435d2916c0a5c1b4eb100;p=linux-beck.git

[SCSI] Fix incorrect reporting of host protection capabilities

The advent of DIF Type 2 devices exposed some missing break statements
in the protection mask switch constructs.  However, rewriting the code
to use an index into a small static array seemed like a more elegant
solution.

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

diff --git a/include/scsi/scsi_host.h b/include/scsi/scsi_host.h
index 6e728b176904..47941fc5aba7 100644
--- a/include/scsi/scsi_host.h
+++ b/include/scsi/scsi_host.h
@@ -797,30 +797,23 @@ 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:
-		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;
-	}
+	static unsigned char cap[] = { 0,
+				       SHOST_DIF_TYPE1_PROTECTION,
+				       SHOST_DIF_TYPE2_PROTECTION,
+				       SHOST_DIF_TYPE3_PROTECTION };
 
-	return 0;
+	return shost->prot_capabilities & cap[target_type] ? target_type : 0;
 }
 
 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;
-	}
+	static unsigned char cap[] = { SHOST_DIX_TYPE0_PROTECTION,
+				       SHOST_DIX_TYPE1_PROTECTION,
+				       SHOST_DIX_TYPE2_PROTECTION,
+				       SHOST_DIX_TYPE3_PROTECTION };
+
+	return shost->prot_capabilities & cap[target_type];
 #endif
 	return 0;
 }