diff --git a/iscsi-scst/kernel/isert-scst/iser.h b/iscsi-scst/kernel/isert-scst/iser.h
index 082cf9cd4..65ae7e3db 100644
--- a/iscsi-scst/kernel/isert-scst/iser.h
+++ b/iscsi-scst/kernel/isert-scst/iser.h
@@ -36,10 +36,13 @@
 #ifndef __ISER_H__
 #define __ISER_H__
 
-#include <linux/version.h>
 #include <linux/interrupt.h>
 #include <linux/workqueue.h>
 #include <rdma/ib_verbs.h>
+#ifndef INSIDE_KERNEL_TREE
+#include <linux/version.h>
+#endif
+
 #if defined(RHEL_MAJOR) && RHEL_MAJOR -0 == 5
 static inline u16 vlan_dev_vlan_id(const void *dev)
 {
diff --git a/iscsi-scst/kernel/isert-scst/iser_rdma.c b/iscsi-scst/kernel/isert-scst/iser_rdma.c
index e24b5ecdb..bfc03f0d9 100644
--- a/iscsi-scst/kernel/isert-scst/iser_rdma.c
+++ b/iscsi-scst/kernel/isert-scst/iser_rdma.c
@@ -36,9 +36,11 @@
 
 #include <linux/kernel.h>
 #include <linux/vmalloc.h>
-#include <linux/version.h>
 #include <linux/in.h>
 #include <linux/in6.h>
+#ifndef INSIDE_KERNEL_TREE
+#include <linux/version.h>
+#endif
 
 #include "isert_dbg.h"
 #include "iser.h"
diff --git a/iscsi-scst/kernel/isert-scst/isert.h b/iscsi-scst/kernel/isert-scst/isert.h
index ee48c33ea..7a4554bce 100644
--- a/iscsi-scst/kernel/isert-scst/isert.h
+++ b/iscsi-scst/kernel/isert-scst/isert.h
@@ -43,7 +43,6 @@
 #include <linux/mutex.h>
 #include <linux/wait.h>
 #include <linux/init.h>
-#include <linux/version.h>
 
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 37)
 #include <asm/atomic.h>
@@ -55,6 +54,7 @@
 #include <scst/isert_scst.h>
 #include <scst/iscsi_scst.h>
 #else
+#include <linux/version.h>
 #include "isert_scst.h"
 #include "iscsi_scst.h"
 #endif
diff --git a/iscsi-scst/kernel/isert-scst/isert_dbg.h b/iscsi-scst/kernel/isert-scst/isert_dbg.h
index 4531b0c09..9bf2aba17 100644
--- a/iscsi-scst/kernel/isert-scst/isert_dbg.h
+++ b/iscsi-scst/kernel/isert-scst/isert_dbg.h
@@ -16,8 +16,6 @@
 #ifndef ISERT_DBG_H
 #define ISERT_DBG_H
 
-#include <linux/version.h>
-
 #ifdef LOG_PREFIX
 #undef LOG_PREFIX
 #endif
@@ -27,6 +25,7 @@
 #ifdef INSIDE_KERNEL_TREE
 #include <scst/scst_debug.h>
 #else
+#include <linux/version.h>
 #include <scst_debug.h>
 #endif
 
diff --git a/iscsi-scst/kernel/isert-scst/isert_login.c b/iscsi-scst/kernel/isert-scst/isert_login.c
index f0220e958..a6ffea6af 100644
--- a/iscsi-scst/kernel/isert-scst/isert_login.c
+++ b/iscsi-scst/kernel/isert-scst/isert_login.c
@@ -39,7 +39,9 @@
 #include <linux/errno.h>	/* error codes */
 #include <linux/poll.h>
 #include <linux/vmalloc.h>
+#ifndef INSIDE_KERNEL_TREE
 #include <linux/version.h>
+#endif
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 20)
 #include <linux/freezer.h>
 #else
diff --git a/iscsi-scst/kernel/session.c b/iscsi-scst/kernel/session.c
index 19f9b4f84..6111b73d1 100644
--- a/iscsi-scst/kernel/session.c
+++ b/iscsi-scst/kernel/session.c
@@ -14,7 +14,9 @@
  *  GNU General Public License for more details.
  */
 
+#ifndef INSIDE_KERNEL_TREE
 #include <linux/version.h>
+#endif
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(3, 2, 0)
 #include <linux/export.h>
 #endif
diff --git a/scst/src/dev_handlers/scst_user.c b/scst/src/dev_handlers/scst_user.c
index debed3370..6f94728e9 100644
--- a/scst/src/dev_handlers/scst_user.c
+++ b/scst/src/dev_handlers/scst_user.c
@@ -22,10 +22,6 @@
 #include <linux/poll.h>
 #include <linux/stddef.h>
 #include <linux/slab.h>
-#include <linux/version.h>
-#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
-#include <linux/sched/signal.h>
-#endif
 
 #define LOG_PREFIX		DEV_USER_NAME
 
@@ -33,11 +29,16 @@
 #include <scst/scst.h>
 #include <scst/scst_user.h>
 #else
+#include <linux/version.h>
 #include "scst.h"
 #include "scst_user.h"
 #endif
 #include "scst_dev_handler.h"
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
+#include <linux/sched/signal.h>
+#endif
+
 #ifndef INSIDE_KERNEL_TREE
 #if defined(CONFIG_HIGHMEM4G) || defined(CONFIG_HIGHMEM64G)
 #warning HIGHMEM kernel configurations are not supported by this module, \
diff --git a/scst/src/dev_handlers/scst_vdisk.c b/scst/src/dev_handlers/scst_vdisk.c
index db750af52..40e4b038e 100644
--- a/scst/src/dev_handlers/scst_vdisk.c
+++ b/scst/src/dev_handlers/scst_vdisk.c
@@ -1091,7 +1091,9 @@ check:
 			if (virt_dev->unmap_opt_gran == virt_dev->unmap_align)
 				virt_dev->unmap_align = 0;
 			virt_dev->unmap_max_lba_cnt = q->limits.max_discard_sectors >> (block_shift - 9);
+#if LINUX_VERSION_CODE < KERNEL_VERSION(4, 12, 0)
 			virt_dev->discard_zeroes_data = q->limits.discard_zeroes_data;
+#endif
 #else
 			sBUG();
 #endif
diff --git a/scst/src/scst_debug.c b/scst/src/scst_debug.c
index 8d36da1c7..3e5de31b0 100644
--- a/scst/src/scst_debug.c
+++ b/scst/src/scst_debug.c
@@ -19,8 +19,6 @@
  *  GNU General Public License for more details.
  */
 
-#include <linux/version.h>
-
 #ifndef INSIDE_KERNEL_TREE
 #include <linux/version.h>
 #endif
diff --git a/scst/src/scst_event.c b/scst/src/scst_event.c
index 4ec509bf0..ff2a0074b 100644
--- a/scst/src/scst_event.c
+++ b/scst/src/scst_event.c
@@ -11,7 +11,9 @@
 #include <linux/stddef.h>
 #include <linux/slab.h>
 #include <linux/module.h>
+#ifndef INSIDE_KERNEL_TREE
 #include <linux/version.h>
+#endif
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
 #include <linux/sched/signal.h>
 #endif
diff --git a/scst/src/scst_lib.c b/scst/src/scst_lib.c
index 788a17351..735261405 100644
--- a/scst/src/scst_lib.c
+++ b/scst/src/scst_lib.c
@@ -33,7 +33,9 @@
 #include <asm/kmap_types.h>
 #include <asm/unaligned.h>
 #include <asm/checksum.h>
+#ifndef INSIDE_KERNEL_TREE
 #include <linux/version.h>
+#endif
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 27)
 #include <linux/crc-t10dif.h>
 #endif
@@ -43,10 +45,6 @@
 #include <linux/namei.h>
 #include <linux/mount.h>
 
-#ifndef INSIDE_KERNEL_TREE
-#include <linux/version.h>
-#endif
-
 #if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 29)
 #include <linux/writeback.h>
 #endif
@@ -8366,7 +8364,7 @@ out:
 static void scsi_end_async(struct request *req, int error)
 {
 	struct scsi_io_context *sioc = req->end_io_data;
-	int errors;
+	int result;
 
 	TRACE_DBG("sioc %p, cmd %p, error %d / %d", sioc, sioc->data, error,
 		  req->errors);
@@ -8378,20 +8376,31 @@ static void scsi_end_async(struct request *req, int error)
 		lockdep_assert_held(req->q->queue_lock);
 #endif
 
-	errors = req->errors && !IS_ERR_VALUE((long)req->errors) ? req->errors :
-		IS_ERR_VALUE((long)req->errors) || error ?
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0)
+	result = scsi_req(req)->result;
+#else
+	result = req->errors;
+#endif
+	result = result && !IS_ERR_VALUE((long)result) ? result :
+		IS_ERR_VALUE((long)result) || error ?
 		SAM_STAT_CHECK_CONDITION : 0;
 
-	if (sioc->done)
+	if (sioc->done) {
+		int resid_len;
+
 #if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 11, 0)
-		sioc->done(sioc->data, sioc->sense, errors,
-			   scsi_req(req)->resid_len);
+		resid_len = scsi_req(req)->resid_len;
 #elif LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
-		sioc->done(sioc->data, sioc->sense, errors, req->resid_len);
-#else
-		sioc->done(sioc->data, sioc->sense, errors, req->data_len);
+		resid_len = req->resid_len;
 #endif
 
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(2, 6, 30)
+		sioc->done(sioc->data, sioc->sense, result, resid_len);
+#else
+		sioc->done(sioc->data, sioc->sense, result, req->data_len);
+#endif
+	}
+
 	kmem_cache_free(scsi_io_context_cache, sioc);
 
 	__blk_put_request(req->q, req);
@@ -8479,7 +8488,11 @@ int scst_scsi_exec_async(struct scst_cmd *cmd, void *data,
 	req->sense = sioc->sense;
 	req->sense_len = sizeof(sioc->sense);
 	rq->timeout = cmd->timeout;
+#if LINUX_VERSION_CODE >= KERNEL_VERSION(4, 12, 0)
+	req->retries = cmd->retries;
+#else
 	rq->retries = cmd->retries;
+#endif
 	rq->end_io_data = sioc;
 #if LINUX_VERSION_CODE > KERNEL_VERSION(2, 6, 35)
 	rq->cmd_flags |= REQ_FAILFAST_MASK;