target: Remove t10_reservation.pr_aptpl_buf_len

It's only ever set to PR_APTPL_BUF_LEN, so we don't need a variable.
Signed-off-by: Andy Grover <agrover@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>

drivers/target/target_core_device.c

@@ -1410,7 +1410,6 @@ struct se_device *target_alloc_device(struct se_hba *hba, const char *name)
 	INIT_LIST_HEAD(&dev->t10_alua.tg_pt_gps_list);
 	spin_lock_init(&dev->t10_alua.tg_pt_gps_lock);
 
-	dev->t10_pr.pr_aptpl_buf_len = PR_APTPL_BUF_LEN;
 	dev->t10_wwn.t10_dev = dev;
 	dev->t10_alua.t10_dev = dev;
 

drivers/target/target_core_pr.c

@@ -606,8 +606,7 @@ static struct t10_pr_registration *__core_scsi3_do_alloc_registration(
 		return NULL;
 	}
 
-	pr_reg->pr_aptpl_buf = kzalloc(dev->t10_pr.pr_aptpl_buf_len,
-					GFP_ATOMIC);
+	pr_reg->pr_aptpl_buf = kzalloc(PR_APTPL_BUF_LEN, GFP_ATOMIC);
 	if (!pr_reg->pr_aptpl_buf) {
 		pr_err("Unable to allocate pr_reg->pr_aptpl_buf\n");
 		kmem_cache_free(t10_pr_reg_cache, pr_reg);
@@ -804,7 +803,7 @@ int core_scsi3_alloc_aptpl_registration(
 		pr_err("Unable to allocate struct t10_pr_registration\n");
 		return -ENOMEM;
 	}
-	pr_reg->pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len, GFP_KERNEL);
+	pr_reg->pr_aptpl_buf = kzalloc(PR_APTPL_BUF_LEN, GFP_KERNEL);
 
 	INIT_LIST_HEAD(&pr_reg->pr_reg_list);
 	INIT_LIST_HEAD(&pr_reg->pr_reg_abort_list);
@@ -2090,8 +2089,7 @@ core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
 				se_sess->se_node_acl, se_sess);
 
 		if (core_scsi3_update_and_write_aptpl(cmd->se_dev,
-				&pr_reg->pr_aptpl_buf[0],
-				pr_tmpl->pr_aptpl_buf_len)) {
+				pr_reg->pr_aptpl_buf, PR_APTPL_BUF_LEN)) {
 			pr_tmpl->pr_aptpl_active = 1;
 			pr_debug("SPC-3 PR: Set APTPL Bit Activated for REGISTER\n");
 		}
@@ -2140,8 +2138,7 @@ core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
 	 * Allocate APTPL metadata buffer used for UNREGISTER ops
 	 */
 	if (aptpl) {
-		pr_aptpl_buf = kzalloc(pr_tmpl->pr_aptpl_buf_len,
-					GFP_KERNEL);
+		pr_aptpl_buf = kzalloc(PR_APTPL_BUF_LEN, GFP_KERNEL);
 		if (!pr_aptpl_buf) {
 			pr_err("Unable to allocate"
 				" pr_aptpl_buf\n");
@@ -2229,8 +2226,7 @@ core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
 			return 0;
 		}
 
-		if (!core_scsi3_update_and_write_aptpl(dev, &pr_aptpl_buf[0],
-				pr_tmpl->pr_aptpl_buf_len)) {
+		if (!core_scsi3_update_and_write_aptpl(dev, pr_aptpl_buf, PR_APTPL_BUF_LEN)) {
 			pr_tmpl->pr_aptpl_active = 1;
 			pr_debug("SPC-3 PR: Set APTPL Bit Activated"
 					" for UNREGISTER\n");
@@ -2262,8 +2258,7 @@ core_scsi3_emulate_pro_register(struct se_cmd *cmd, u64 res_key, u64 sa_res_key,
 		goto out_put_pr_reg;
 	}
 
-	if (!core_scsi3_update_and_write_aptpl(dev, &pr_aptpl_buf[0],
-						pr_tmpl->pr_aptpl_buf_len)) {
+	if (!core_scsi3_update_and_write_aptpl(dev, pr_aptpl_buf, PR_APTPL_BUF_LEN)) {
 		pr_tmpl->pr_aptpl_active = 1;
 		pr_debug("SPC-3 PR: Set APTPL Bit Activated"
 			" for REGISTER\n");
@@ -2448,8 +2443,7 @@ core_scsi3_pro_reserve(struct se_cmd *cmd, int type, int scope, u64 res_key)
 
 	if (pr_tmpl->pr_aptpl_active) {
 		if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
-				&pr_reg->pr_aptpl_buf[0],
-				pr_tmpl->pr_aptpl_buf_len)) {
+				pr_reg->pr_aptpl_buf, PR_APTPL_BUF_LEN)) {
 			pr_debug("SPC-3 PR: Updated APTPL metadata"
 					" for RESERVE\n");
 		}
@@ -2669,7 +2663,7 @@ core_scsi3_emulate_pro_release(struct se_cmd *cmd, int type, int scope,
 write_aptpl:
 	if (pr_tmpl->pr_aptpl_active) {
 		if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
-			&pr_reg->pr_aptpl_buf[0], pr_tmpl->pr_aptpl_buf_len)) {
+			pr_reg->pr_aptpl_buf, PR_APTPL_BUF_LEN)) {
 			pr_debug("SPC-3 PR: Updated APTPL metadata for RELEASE\n");
 		}
 	}
@@ -2996,8 +2990,7 @@ core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
 
 		if (pr_tmpl->pr_aptpl_active) {
 			if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
-					&pr_reg_n->pr_aptpl_buf[0],
-					pr_tmpl->pr_aptpl_buf_len)) {
+					pr_reg_n->pr_aptpl_buf,	PR_APTPL_BUF_LEN)) {
 				pr_debug("SPC-3 PR: Updated APTPL"
 					" metadata for  PREEMPT%s\n", (preempt_type == PREEMPT_AND_ABORT) ?
 					"_AND_ABORT" : "");
@@ -3132,8 +3125,7 @@ core_scsi3_pro_preempt(struct se_cmd *cmd, int type, int scope, u64 res_key,
 
 	if (pr_tmpl->pr_aptpl_active) {
 		if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
-				&pr_reg_n->pr_aptpl_buf[0],
-				pr_tmpl->pr_aptpl_buf_len)) {
+				pr_reg_n->pr_aptpl_buf, PR_APTPL_BUF_LEN)) {
 			pr_debug("SPC-3 PR: Updated APTPL metadata for PREEMPT"
 				"%s\n", (preempt_type == PREEMPT_AND_ABORT) ? "_AND_ABORT" : "");
 		}
@@ -3576,8 +3568,7 @@ core_scsi3_emulate_pro_register_and_move(struct se_cmd *cmd, u64 res_key,
 	} else {
 		pr_tmpl->pr_aptpl_active = 1;
 		if (!core_scsi3_update_and_write_aptpl(cmd->se_dev,
-				&dest_pr_reg->pr_aptpl_buf[0],
-				pr_tmpl->pr_aptpl_buf_len)) {
+				dest_pr_reg->pr_aptpl_buf, PR_APTPL_BUF_LEN)) {
 			pr_debug("SPC-3 PR: Set APTPL Bit Activated for"
 					" REGISTER_AND_MOVE\n");
 		}

include/target/target_core_base.h

@@ -374,9 +374,7 @@ struct t10_reservation {
 	/* Activate Persistence across Target Power Loss enabled
 	 * for SCSI device */
 	int pr_aptpl_active;
-	/* Used by struct t10_reservation->pr_aptpl_buf_len */
 #define PR_APTPL_BUF_LEN			8192
-	u32 pr_aptpl_buf_len;
 	u32 pr_generation;
 	spinlock_t registration_lock;
 	spinlock_t aptpl_reg_lock;