target: Use {get,put}_unaligned_be*() instead of open coding these functions

Introduce the function get_unaligned_be24(). Use {get,put}_unaligned_be*()
where appropriate. This patch does not change any functionality.

Signed-off-by: Bart Van Assche <bart.vanassche@sandisk.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Hannes Reinecke <hare@suse.com>
Cc: Andy Grover <agrover@redhat.com>
Cc: David Disseldorp <ddiss@suse.de>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

9 files changed, 83 insertions, 171 deletions

diff --git a/drivers/target/target_core_alua.c b/drivers/target/target_core_alua.c
index fc4a9c303d55..a91b7c25ffd4 100644
--- a/drivers/target/target_core_alua.c
+++ b/drivers/target/target_core_alua.c
@@ -205,8 +205,8 @@ target_emulate_report_target_port_groups(struct se_cmd *cmd)
 		/*
 		 * TARGET PORT GROUP
 		 */
-		buf[off++] = ((tg_pt_gp->tg_pt_gp_id >> 8) & 0xff);
-		buf[off++] = (tg_pt_gp->tg_pt_gp_id & 0xff);
+		put_unaligned_be16(tg_pt_gp->tg_pt_gp_id, &buf[off]);
+		off += 2;
 
 		off++; /* Skip over Reserved */
 		/*
@@ -235,8 +235,8 @@ target_emulate_report_target_port_groups(struct se_cmd *cmd)
 			/*
 			 * Set RELATIVE TARGET PORT IDENTIFIER
 			 */
-			buf[off++] = ((lun->lun_rtpi >> 8) & 0xff);
-			buf[off++] = (lun->lun_rtpi & 0xff);
+			put_unaligned_be16(lun->lun_rtpi, &buf[off]);
+			off += 2;
 			rd_len += 4;
 		}
 		spin_unlock(&tg_pt_gp->tg_pt_gp_lock);
diff --git a/drivers/target/target_core_device.c b/drivers/target/target_core_device.c
index 1f54b397bd57..11c80c47b9d3 100644
--- a/drivers/target/target_core_device.c
+++ b/drivers/target/target_core_device.c
@@ -1091,19 +1091,19 @@ passthrough_parse_cdb(struct se_cmd *cmd,
 	      TRANSPORT_FLAG_PASSTHROUGH_PGR)) {
 		if (cdb[0] == PERSISTENT_RESERVE_IN) {
 			cmd->execute_cmd = target_scsi3_emulate_pr_in;
-			size = (cdb[7] << 8) + cdb[8];
+			size = get_unaligned_be16(&cdb[7]);
 			return target_cmd_size_check(cmd, size);
 		}
 		if (cdb[0] == PERSISTENT_RESERVE_OUT) {
 			cmd->execute_cmd = target_scsi3_emulate_pr_out;
-			size = (cdb[7] << 8) + cdb[8];
+			size = get_unaligned_be16(&cdb[7]);
 			return target_cmd_size_check(cmd, size);
 		}
 
 		if (cdb[0] == RELEASE || cdb[0] == RELEASE_10) {
 			cmd->execute_cmd = target_scsi2_reservation_release;
 			if (cdb[0] == RELEASE_10)
-				size = (cdb[7] << 8) | cdb[8];
+				size = get_unaligned_be16(&cdb[7]);
 			else
 				size = cmd->data_length;
 			return target_cmd_size_check(cmd, size);
@@ -1111,7 +1111,7 @@ passthrough_parse_cdb(struct se_cmd *cmd,
 		if (cdb[0] == RESERVE || cdb[0] == RESERVE_10) {
 			cmd->execute_cmd = target_scsi2_reservation_reserve;
 			if (cdb[0] == RESERVE_10)
-				size = (cdb[7] << 8) | cdb[8];
+				size = get_unaligned_be16(&cdb[7]);
 			else
 				size = cmd->data_length;
 			return target_cmd_size_check(cmd, size);
diff --git a/drivers/target/target_core_fabric_lib.c b/drivers/target/target_core_fabric_lib.c
index cb6497ce4b61..508da345b73f 100644
--- a/drivers/target/target_core_fabric_lib.c
+++ b/drivers/target/target_core_fabric_lib.c
@@ -34,6 +34,7 @@
 #include <linux/ctype.h>
 #include <linux/spinlock.h>
 #include <linux/export.h>
+#include <asm/unaligned.h>
 
 #include <scsi/scsi_proto.h>
 
@@ -216,8 +217,7 @@ static int iscsi_get_pr_transport_id(
 	if (padding != 0)
 		len += padding;
 
-	buf[2] = ((len >> 8) & 0xff);
-	buf[3] = (len & 0xff);
+	put_unaligned_be16(len, &buf[2]);
 	/*
 	 * Increment value for total payload + header length for
 	 * full status descriptor
@@ -306,7 +306,7 @@ static char *iscsi_parse_pr_out_transport_id(
 	 */
 	if (out_tid_len) {
 		/* The shift works thanks to integer promotion rules */
-		add_len = (buf[2] << 8) | buf[3];
+		add_len = get_unaligned_be16(&buf[2]);
 
 		tid_len = strlen(&buf[4]);
 		tid_len += 4; /* Add four bytes for iSCSI Transport ID header */
diff --git a/drivers/target/target_core_pr.c b/drivers/target/target_core_pr.c
index 129ca572673c..9921d4d6bb41 100644
--- a/drivers/target/target_core_pr.c
+++ b/drivers/target/target_core_pr.c
@@ -1562,10 +1562,7 @@ core_scsi3_decode_spec_i_port(
 	 * first extract TransportID Parameter Data Length, and make sure
 	 * the value matches up to the SCSI expected data transfer length.
 	 */
-	tpdl = (buf[24] & 0xff) << 24;
-	tpdl |= (buf[25] & 0xff) << 16;
-	tpdl |= (buf[26] & 0xff) << 8;
-	tpdl |= buf[27] & 0xff;
+	tpdl = get_unaligned_be32(&buf[24]);
 
 	if ((tpdl + 28) != cmd->data_length) {
 		pr_err("SPC-3 PR: Illegal tpdl: %u + 28 byte header"
@@ -3221,12 +3218,8 @@ core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
 		goto out_put_pr_reg;
 	}
 
-	rtpi = (buf[18] & 0xff) << 8;
-	rtpi |= buf[19] & 0xff;
-	tid_len = (buf[20] & 0xff) << 24;
-	tid_len |= (buf[21] & 0xff) << 16;
-	tid_len |= (buf[22] & 0xff) << 8;
-	tid_len |= buf[23] & 0xff;
+	rtpi = get_unaligned_be16(&buf[18]);
+	tid_len = get_unaligned_be32(&buf[20]);
 	transport_kunmap_data_sg(cmd);
 	buf = NULL;
 
@@ -3552,16 +3545,6 @@ out_put_pr_reg:
 	return ret;
 }
 
-static unsigned long long core_scsi3_extract_reservation_key(unsigned char *cdb)
-{
-	unsigned int __v1, __v2;
-
-	__v1 = (cdb[0] << 24) | (cdb[1] << 16) | (cdb[2] << 8) | cdb[3];
-	__v2 = (cdb[4] << 24) | (cdb[5] << 16) | (cdb[6] << 8) | cdb[7];
-
-	return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
-}
-
 /*
  * See spc4r17 section 6.14 Table 170
  */
@@ -3619,8 +3602,8 @@ target_scsi3_emulate_pr_out(struct se_cmd *cmd)
 	/*
 	 * From PERSISTENT_RESERVE_OUT parameter list (payload)
 	 */
-	res_key = core_scsi3_extract_reservation_key(&buf[0]);
-	sa_res_key = core_scsi3_extract_reservation_key(&buf[8]);
+	res_key = get_unaligned_be64(&buf[0]);
+	sa_res_key = get_unaligned_be64(&buf[8]);
 	/*
 	 * REGISTER_AND_MOVE uses a different SA parameter list containing
 	 * SCSI TransportIDs.
@@ -3734,10 +3717,7 @@ core_scsi3_pri_read_keys(struct se_cmd *cmd)
 	if (!buf)
 		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 
-	buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
-	buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
-	buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
-	buf[3] = (dev->t10_pr.pr_generation & 0xff);
+	put_unaligned_be32(dev->t10_pr.pr_generation, buf);
 
 	spin_lock(&dev->t10_pr.registration_lock);
 	list_for_each_entry(pr_reg, &dev->t10_pr.registration_list,
@@ -3749,23 +3729,13 @@ core_scsi3_pri_read_keys(struct se_cmd *cmd)
 		if ((add_len + 8) > (cmd->data_length - 8))
 			break;
 
-		buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
-		buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
-		buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
-		buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
-		buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
-		buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
-		buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
-		buf[off++] = (pr_reg->pr_res_key & 0xff);
-
+		put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);
+		off += 8;
 		add_len += 8;
 	}
 	spin_unlock(&dev->t10_pr.registration_lock);
 
-	buf[4] = ((add_len >> 24) & 0xff);
-	buf[5] = ((add_len >> 16) & 0xff);
-	buf[6] = ((add_len >> 8) & 0xff);
-	buf[7] = (add_len & 0xff);
+	put_unaligned_be32(add_len, &buf[4]);
 
 	transport_kunmap_data_sg(cmd);
 
@@ -3796,10 +3766,7 @@ core_scsi3_pri_read_reservation(struct se_cmd *cmd)
 	if (!buf)
 		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 
-	buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
-	buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
-	buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
-	buf[3] = (dev->t10_pr.pr_generation & 0xff);
+	put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);
 
 	spin_lock(&dev->dev_reservation_lock);
 	pr_reg = dev->dev_pr_res_holder;
@@ -3807,10 +3774,7 @@ core_scsi3_pri_read_reservation(struct se_cmd *cmd)
 		/*
 		 * Set the hardcoded Additional Length
 		 */
-		buf[4] = ((add_len >> 24) & 0xff);
-		buf[5] = ((add_len >> 16) & 0xff);
-		buf[6] = ((add_len >> 8) & 0xff);
-		buf[7] = (add_len & 0xff);
+		put_unaligned_be32(add_len, &buf[4]);
 
 		if (cmd->data_length < 22)
 			goto err;
@@ -3837,14 +3801,7 @@ core_scsi3_pri_read_reservation(struct se_cmd *cmd)
 		else
 			pr_res_key = pr_reg->pr_res_key;
 
-		buf[8] = ((pr_res_key >> 56) & 0xff);
-		buf[9] = ((pr_res_key >> 48) & 0xff);
-		buf[10] = ((pr_res_key >> 40) & 0xff);
-		buf[11] = ((pr_res_key >> 32) & 0xff);
-		buf[12] = ((pr_res_key >> 24) & 0xff);
-		buf[13] = ((pr_res_key >> 16) & 0xff);
-		buf[14] = ((pr_res_key >> 8) & 0xff);
-		buf[15] = (pr_res_key & 0xff);
+		put_unaligned_be64(pr_res_key, &buf[8]);
 		/*
 		 * Set the SCOPE and TYPE
 		 */
@@ -3882,8 +3839,7 @@ core_scsi3_pri_report_capabilities(struct se_cmd *cmd)
 	if (!buf)
 		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 
-	buf[0] = ((add_len >> 8) & 0xff);
-	buf[1] = (add_len & 0xff);
+	put_unaligned_be16(add_len, &buf[0]);
 	buf[2] |= 0x10; /* CRH: Compatible Reservation Hanlding bit. */
 	buf[2] |= 0x08; /* SIP_C: Specify Initiator Ports Capable bit */
 	buf[2] |= 0x04; /* ATP_C: All Target Ports Capable bit */
@@ -3947,10 +3903,7 @@ core_scsi3_pri_read_full_status(struct se_cmd *cmd)
 	if (!buf)
 		return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
 
-	buf[0] = ((dev->t10_pr.pr_generation >> 24) & 0xff);
-	buf[1] = ((dev->t10_pr.pr_generation >> 16) & 0xff);
-	buf[2] = ((dev->t10_pr.pr_generation >> 8) & 0xff);
-	buf[3] = (dev->t10_pr.pr_generation & 0xff);
+	put_unaligned_be32(dev->t10_pr.pr_generation, &buf[0]);
 
 	spin_lock(&dev->dev_reservation_lock);
 	if (dev->dev_pr_res_holder) {
@@ -3992,14 +3945,8 @@ core_scsi3_pri_read_full_status(struct se_cmd *cmd)
 		/*
 		 * Set RESERVATION KEY
 		 */
-		buf[off++] = ((pr_reg->pr_res_key >> 56) & 0xff);
-		buf[off++] = ((pr_reg->pr_res_key >> 48) & 0xff);
-		buf[off++] = ((pr_reg->pr_res_key >> 40) & 0xff);
-		buf[off++] = ((pr_reg->pr_res_key >> 32) & 0xff);
-		buf[off++] = ((pr_reg->pr_res_key >> 24) & 0xff);
-		buf[off++] = ((pr_reg->pr_res_key >> 16) & 0xff);
-		buf[off++] = ((pr_reg->pr_res_key >> 8) & 0xff);
-		buf[off++] = (pr_reg->pr_res_key & 0xff);
+		put_unaligned_be64(pr_reg->pr_res_key, &buf[off]);
+		off += 8;
 		off += 4; /* Skip Over Reserved area */
 
 		/*
@@ -4041,8 +3988,8 @@ core_scsi3_pri_read_full_status(struct se_cmd *cmd)
 		if (!pr_reg->pr_reg_all_tg_pt) {
 			u16 sep_rtpi = pr_reg->tg_pt_sep_rtpi;
 
-			buf[off++] = ((sep_rtpi >> 8) & 0xff);
-			buf[off++] = (sep_rtpi & 0xff);
+			put_unaligned_be16(sep_rtpi, &buf[off]);
+			off += 2;
 		} else
 			off += 2; /* Skip over RELATIVE TARGET PORT IDENTIFIER */
 
@@ -4062,10 +4009,7 @@ core_scsi3_pri_read_full_status(struct se_cmd *cmd)
 		/*
 		 * Set the ADDITIONAL DESCRIPTOR LENGTH
 		 */
-		buf[off++] = ((desc_len >> 24) & 0xff);
-		buf[off++] = ((desc_len >> 16) & 0xff);
-		buf[off++] = ((desc_len >> 8) & 0xff);
-		buf[off++] = (desc_len & 0xff);
+		put_unaligned_be32(desc_len, &buf[off]);
 		/*
 		 * Size of full desctipor header minus TransportID
 		 * containing $FABRIC_MOD specific) initiator device/port
@@ -4082,10 +4026,7 @@ core_scsi3_pri_read_full_status(struct se_cmd *cmd)
 	/*
 	 * Set ADDITIONAL_LENGTH
 	 */
-	buf[4] = ((add_len >> 24) & 0xff);
-	buf[5] = ((add_len >> 16) & 0xff);
-	buf[6] = ((add_len >> 8) & 0xff);
-	buf[7] = (add_len & 0xff);
+	put_unaligned_be32(add_len, &buf[4]);
 
 	transport_kunmap_data_sg(cmd);
 
diff --git a/drivers/target/target_core_pscsi.c b/drivers/target/target_core_pscsi.c
index 3e4abb13f8ea..e0be4aa38328 100644
--- a/drivers/target/target_core_pscsi.c
+++ b/drivers/target/target_core_pscsi.c
@@ -168,7 +168,7 @@ static void pscsi_tape_read_blocksize(struct se_device *dev,
 	/*
 	 * If MODE_SENSE still returns zero, set the default value to 1024.
 	 */
-	sdev->sector_size = (buf[9] << 16) | (buf[10] << 8) | (buf[11]);
+	sdev->sector_size = get_unaligned_be24(&buf[9]);
 out_free:
 	if (!sdev->sector_size)
 		sdev->sector_size = 1024;
@@ -209,8 +209,7 @@ pscsi_get_inquiry_vpd_serial(struct scsi_device *sdev, struct t10_wwn *wwn)
 	cdb[0] = INQUIRY;
 	cdb[1] = 0x01; /* Query VPD */
 	cdb[2] = 0x80; /* Unit Serial Number */
-	cdb[3] = (INQUIRY_VPD_SERIAL_LEN >> 8) & 0xff;
-	cdb[4] = (INQUIRY_VPD_SERIAL_LEN & 0xff);
+	put_unaligned_be16(INQUIRY_VPD_SERIAL_LEN, &cdb[3]);
 
 	ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
 			      INQUIRY_VPD_SERIAL_LEN, NULL, HZ, 1, NULL);
@@ -245,8 +244,7 @@ pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
 	cdb[0] = INQUIRY;
 	cdb[1] = 0x01; /* Query VPD */
 	cdb[2] = 0x83; /* Device Identifier */
-	cdb[3] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN >> 8) & 0xff;
-	cdb[4] = (INQUIRY_VPD_DEVICE_IDENTIFIER_LEN & 0xff);
+	put_unaligned_be16(INQUIRY_VPD_DEVICE_IDENTIFIER_LEN, &cdb[3]);
 
 	ret = scsi_execute_req(sdev, cdb, DMA_FROM_DEVICE, buf,
 			      INQUIRY_VPD_DEVICE_IDENTIFIER_LEN,
@@ -254,7 +252,7 @@ pscsi_get_inquiry_vpd_device_ident(struct scsi_device *sdev,
 	if (ret)
 		goto out;
 
-	page_len = (buf[2] << 8) | buf[3];
+	page_len = get_unaligned_be16(&buf[2]);
 	while (page_len > 0) {
 		/* Grab a pointer to the Identification descriptor */
 		page_83 = &buf[off];
@@ -669,19 +667,17 @@ after_mode_sense:
 		}
 
 		if (cdb[0] == MODE_SELECT)
-			bdl = (buf[3]);
+			bdl = buf[3];
 		else
-			bdl = (buf[6] << 8) | (buf[7]);
+			bdl = get_unaligned_be16(&buf[6]);
 
 		if (!bdl)
 			goto after_mode_select;
 
 		if (cdb[0] == MODE_SELECT)
-			blocksize = (buf[9] << 16) | (buf[10] << 8) |
-					(buf[11]);
+			blocksize = get_unaligned_be24(&buf[9]);
 		else
-			blocksize = (buf[13] << 16) | (buf[14] << 8) |
-					(buf[15]);
+			blocksize = get_unaligned_be24(&buf[13]);
 
 		sd->sector_size = blocksize;
 	}
diff --git a/drivers/target/target_core_sbc.c b/drivers/target/target_core_sbc.c
index ff4a6ec30adf..ca42fba882db 100644
--- a/drivers/target/target_core_sbc.c
+++ b/drivers/target/target_core_sbc.c
@@ -71,14 +71,8 @@ sbc_emulate_readcapacity(struct se_cmd *cmd)
 	else
 		blocks = (u32)blocks_long;
 
-	buf[0] = (blocks >> 24) & 0xff;
-	buf[1] = (blocks >> 16) & 0xff;
-	buf[2] = (blocks >> 8) & 0xff;
-	buf[3] = blocks & 0xff;
-	buf[4] = (dev->dev_attrib.block_size >> 24) & 0xff;
-	buf[5] = (dev->dev_attrib.block_size >> 16) & 0xff;
-	buf[6] = (dev->dev_attrib.block_size >> 8) & 0xff;
-	buf[7] = dev->dev_attrib.block_size & 0xff;
+	put_unaligned_be32(blocks, &buf[0]);
+	put_unaligned_be32(dev->dev_attrib.block_size, &buf[4]);
 
 	rbuf = transport_kmap_data_sg(cmd);
 	if (rbuf) {
@@ -102,18 +96,8 @@ sbc_emulate_readcapacity_16(struct se_cmd *cmd)
 	unsigned long long blocks = dev->transport->get_blocks(dev);
 
 	memset(buf, 0, sizeof(buf));
-	buf[0] = (blocks >> 56) & 0xff;
-	buf[1] = (blocks >> 48) & 0xff;
-	buf[2] = (blocks >> 40) & 0xff;
-	buf[3] = (blocks >> 32) & 0xff;
-	buf[4] = (blocks >> 24) & 0xff;
-	buf[5] = (blocks >> 16) & 0xff;
-	buf[6] = (blocks >> 8) & 0xff;
-	buf[7] = blocks & 0xff;
-	buf[8] = (dev->dev_attrib.block_size >> 24) & 0xff;
-	buf[9] = (dev->dev_attrib.block_size >> 16) & 0xff;
-	buf[10] = (dev->dev_attrib.block_size >> 8) & 0xff;
-	buf[11] = dev->dev_attrib.block_size & 0xff;
+	put_unaligned_be64(blocks, &buf[0]);
+	put_unaligned_be32(dev->dev_attrib.block_size, &buf[8]);
 	/*
 	 * Set P_TYPE and PROT_EN bits for DIF support
 	 */
@@ -134,8 +118,8 @@ sbc_emulate_readcapacity_16(struct se_cmd *cmd)
 
 	if (dev->transport->get_alignment_offset_lbas) {
 		u16 lalba = dev->transport->get_alignment_offset_lbas(dev);
-		buf[14] = (lalba >> 8) & 0x3f;
-		buf[15] = lalba & 0xff;
+
+		put_unaligned_be16(lalba, &buf[14]);
 	}
 
 	/*
@@ -262,18 +246,17 @@ static inline u32 transport_get_sectors_6(unsigned char *cdb)
 
 static inline u32 transport_get_sectors_10(unsigned char *cdb)
 {
-	return (u32)(cdb[7] << 8) + cdb[8];
+	return get_unaligned_be16(&cdb[7]);
 }
 
 static inline u32 transport_get_sectors_12(unsigned char *cdb)
 {
-	return (u32)(cdb[6] << 24) + (cdb[7] << 16) + (cdb[8] << 8) + cdb[9];
+	return get_unaligned_be32(&cdb[6]);
 }
 
 static inline u32 transport_get_sectors_16(unsigned char *cdb)
 {
-	return (u32)(cdb[10] << 24) + (cdb[11] << 16) +
-		    (cdb[12] << 8) + cdb[13];
+	return get_unaligned_be32(&cdb[10]);
 }
 
 /*
@@ -281,29 +264,23 @@ static inline u32 transport_get_sectors_16(unsigned char *cdb)
  */
 static inline u32 transport_get_sectors_32(unsigned char *cdb)
 {
-	return (u32)(cdb[28] << 24) + (cdb[29] << 16) +
-		    (cdb[30] << 8) + cdb[31];
+	return get_unaligned_be32(&cdb[28]);
 
 }
 
 static inline u32 transport_lba_21(unsigned char *cdb)
 {
-	return ((cdb[1] & 0x1f) << 16) | (cdb[2] << 8) | cdb[3];
+	return get_unaligned_be24(&cdb[1]) & 0x1fffff;
 }
 
 static inline u32 transport_lba_32(unsigned char *cdb)
 {
-	return (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
+	return get_unaligned_be32(&cdb[2]);
 }
 
 static inline unsigned long long transport_lba_64(unsigned char *cdb)
 {
-	unsigned int __v1, __v2;
-
-	__v1 = (cdb[2] << 24) | (cdb[3] << 16) | (cdb[4] << 8) | cdb[5];
-	__v2 = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
-
-	return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
+	return get_unaligned_be64(&cdb[2]);
 }
 
 /*
@@ -311,12 +288,7 @@ static inline unsigned long long transport_lba_64(unsigned char *cdb)
  */
 static inline unsigned long long transport_lba_64_ext(unsigned char *cdb)
 {
-	unsigned int __v1, __v2;
-
-	__v1 = (cdb[12] << 24) | (cdb[13] << 16) | (cdb[14] << 8) | cdb[15];
-	__v2 = (cdb[16] << 24) | (cdb[17] << 16) | (cdb[18] << 8) | cdb[19];
-
-	return ((unsigned long long)__v2) | (unsigned long long)__v1 << 32;
+	return get_unaligned_be64(&cdb[12]);
 }
 
 static sense_reason_t
@@ -1051,8 +1023,7 @@ sbc_parse_cdb(struct se_cmd *cmd, struct sbc_ops *ops)
 				cmd->t_task_cdb[1] & 0x1f);
 			return TCM_INVALID_CDB_FIELD;
 		}
-		size = (cdb[10] << 24) | (cdb[11] << 16) |
-		       (cdb[12] << 8) | cdb[13];
+		size = get_unaligned_be32(&cdb[10]);
 		break;
 	case SYNCHRONIZE_CACHE:
 	case SYNCHRONIZE_CACHE_16:
diff --git a/drivers/target/target_core_spc.c b/drivers/target/target_core_spc.c
index 2a91ed3ef380..f59ac7671031 100644
--- a/drivers/target/target_core_spc.c
+++ b/drivers/target/target_core_spc.c
@@ -287,8 +287,8 @@ check_t10_vend_desc:
 		/* Skip over Obsolete field in RTPI payload
 		 * in Table 472 */
 		off += 2;
-		buf[off++] = ((lun->lun_rtpi >> 8) & 0xff);
-		buf[off++] = (lun->lun_rtpi & 0xff);
+		put_unaligned_be16(lun->lun_rtpi, &buf[off]);
+		off += 2;
 		len += 8; /* Header size + Designation descriptor */
 		/*
 		 * Target port group identifier, see spc4r17
@@ -316,8 +316,8 @@ check_t10_vend_desc:
 		off++; /* Skip over Reserved */
 		buf[off++] = 4; /* DESIGNATOR LENGTH */
 		off += 2; /* Skip over Reserved Field */
-		buf[off++] = ((tg_pt_gp_id >> 8) & 0xff);
-		buf[off++] = (tg_pt_gp_id & 0xff);
+		put_unaligned_be16(tg_pt_gp_id, &buf[off]);
+		off += 2;
 		len += 8; /* Header size + Designation descriptor */
 		/*
 		 * Logical Unit Group identifier, see spc4r17
@@ -343,8 +343,8 @@ check_lu_gp:
 		off++; /* Skip over Reserved */
 		buf[off++] = 4; /* DESIGNATOR LENGTH */
 		off += 2; /* Skip over Reserved Field */
-		buf[off++] = ((lu_gp_id >> 8) & 0xff);
-		buf[off++] = (lu_gp_id & 0xff);
+		put_unaligned_be16(lu_gp_id, &buf[off]);
+		off += 2;
 		len += 8; /* Header size + Designation descriptor */
 		/*
 		 * SCSI name string designator, see spc4r17
@@ -431,8 +431,7 @@ check_scsi_name:
 		/* Header size + Designation descriptor */
 		len += (scsi_target_len + 4);
 	}
-	buf[2] = ((len >> 8) & 0xff);
-	buf[3] = (len & 0xff); /* Page Length for VPD 0x83 */
+	put_unaligned_be16(len, &buf[2]); /* Page Length for VPD 0x83 */
 	return 0;
 }
 EXPORT_SYMBOL(spc_emulate_evpd_83);
@@ -1288,7 +1287,7 @@ spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
 		cmd->execute_cmd = spc_emulate_modeselect;
 		break;
 	case MODE_SELECT_10:
-		*size = (cdb[7] << 8) + cdb[8];
+		*size = get_unaligned_be16(&cdb[7]);
 		cmd->execute_cmd = spc_emulate_modeselect;
 		break;
 	case MODE_SENSE:
@@ -1296,25 +1295,25 @@ spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
 		cmd->execute_cmd = spc_emulate_modesense;
 		break;
 	case MODE_SENSE_10:
-		*size = (cdb[7] << 8) + cdb[8];
+		*size = get_unaligned_be16(&cdb[7]);
 		cmd->execute_cmd = spc_emulate_modesense;
 		break;
 	case LOG_SELECT:
 	case LOG_SENSE:
-		*size = (cdb[7] << 8) + cdb[8];
+		*size = get_unaligned_be16(&cdb[7]);
 		break;
 	case PERSISTENT_RESERVE_IN:
-		*size = (cdb[7] << 8) + cdb[8];
+		*size = get_unaligned_be16(&cdb[7]);
 		cmd->execute_cmd = target_scsi3_emulate_pr_in;
 		break;
 	case PERSISTENT_RESERVE_OUT:
-		*size = (cdb[7] << 8) + cdb[8];
+		*size = get_unaligned_be16(&cdb[7]);
 		cmd->execute_cmd = target_scsi3_emulate_pr_out;
 		break;
 	case RELEASE:
 	case RELEASE_10:
 		if (cdb[0] == RELEASE_10)
-			*size = (cdb[7] << 8) | cdb[8];
+			*size = get_unaligned_be16(&cdb[7]);
 		else
 			*size = cmd->data_length;
 
@@ -1327,7 +1326,7 @@ spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
 		 * Assume the passthrough or $FABRIC_MOD will tell us about it.
 		 */
 		if (cdb[0] == RESERVE_10)
-			*size = (cdb[7] << 8) | cdb[8];
+			*size = get_unaligned_be16(&cdb[7]);
 		else
 			*size = cmd->data_length;
 
@@ -1338,7 +1337,7 @@ spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
 		cmd->execute_cmd = spc_emulate_request_sense;
 		break;
 	case INQUIRY:
-		*size = (cdb[3] << 8) + cdb[4];
+		*size = get_unaligned_be16(&cdb[3]);
 
 		/*
 		 * Do implicit HEAD_OF_QUEUE processing for INQUIRY.
@@ -1349,7 +1348,7 @@ spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
 		break;
 	case SECURITY_PROTOCOL_IN:
 	case SECURITY_PROTOCOL_OUT:
-		*size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
+		*size = get_unaligned_be32(&cdb[6]);
 		break;
 	case EXTENDED_COPY:
 		*size = get_unaligned_be32(&cdb[10]);
@@ -1361,19 +1360,18 @@ spc_parse_cdb(struct se_cmd *cmd, unsigned int *size)
 		break;
 	case READ_ATTRIBUTE:
 	case WRITE_ATTRIBUTE:
-		*size = (cdb[10] << 24) | (cdb[11] << 16) |
-		       (cdb[12] << 8) | cdb[13];
+		*size = get_unaligned_be32(&cdb[10]);
 		break;
 	case RECEIVE_DIAGNOSTIC:
 	case SEND_DIAGNOSTIC:
-		*size = (cdb[3] << 8) | cdb[4];
+		*size = get_unaligned_be16(&cdb[3]);
 		break;
 	case WRITE_BUFFER:
-		*size = (cdb[6] << 16) + (cdb[7] << 8) + cdb[8];
+		*size = get_unaligned_be24(&cdb[6]);
 		break;
 	case REPORT_LUNS:
 		cmd->execute_cmd = spc_emulate_report_luns;
-		*size = (cdb[6] << 24) | (cdb[7] << 16) | (cdb[8] << 8) | cdb[9];
+		*size = get_unaligned_be32(&cdb[6]);
 		/*
 		 * Do implicit HEAD_OF_QUEUE processing for REPORT_LUNS
 		 * See spc4r17 section 5.3
diff --git a/drivers/target/target_core_xcopy.c b/drivers/target/target_core_xcopy.c
index cac5a20a4de0..f12cf0c12531 100644
--- a/drivers/target/target_core_xcopy.c
+++ b/drivers/target/target_core_xcopy.c
@@ -311,9 +311,7 @@ static int target_xcopy_parse_segdesc_02(struct se_cmd *se_cmd, struct xcopy_op
 		(unsigned long long)xop->dst_lba);
 
 	if (dc != 0) {
-		xop->dbl = (desc[29] & 0xff) << 16;
-		xop->dbl |= (desc[30] & 0xff) << 8;
-		xop->dbl |= desc[31] & 0xff;
+		xop->dbl = get_unaligned_be24(&desc[29]);
 
 		pr_debug("XCOPY seg desc 0x02: DC=1 w/ dbl: %u\n", xop->dbl);
 	}
diff --git a/include/target/target_core_backend.h b/include/target/target_core_backend.h
index e475531565fd..b76071161cdc 100644
--- a/include/target/target_core_backend.h
+++ b/include/target/target_core_backend.h
@@ -2,6 +2,7 @@
 #define TARGET_CORE_BACKEND_H
 
 #include <linux/types.h>
+#include <asm/unaligned.h>
 #include <target/target_core_base.h>
 
 #define TRANSPORT_FLAG_PASSTHROUGH		0x1
@@ -109,4 +110,11 @@ sector_t target_to_linux_sector(struct se_device *dev, sector_t lb);
 bool target_configure_unmap_from_queue(struct se_dev_attrib *attrib,
 				       struct request_queue *q);
 
+
+/* Only use get_unaligned_be24() if reading p - 1 is allowed. */
+static inline uint32_t get_unaligned_be24(const uint8_t *const p)
+{
+	return get_unaligned_be32(p - 1) & 0xffffffU;
+}
+
 #endif /* TARGET_CORE_BACKEND_H */