Merge tag 'for-v2020.01' of https://gitlab.denx.de/u-boot/custodians/u-boot-ubiWIP/17Oct2019

ubi enhancements for 2020.01
- provide a way for skipping crc checks ported from linux, and add an
  U-Boot command to set this flag on already installed systems.
- fix redundand environment management

6 files changed, 27 insertions, 1 deletions

diff --git a/drivers/mtd/ubi/debug.c b/drivers/mtd/ubi/debug.c
index 0a7427522c..f3d348da83 100644
--- a/drivers/mtd/ubi/debug.c
+++ b/drivers/mtd/ubi/debug.c
@@ -109,6 +109,7 @@ void ubi_dump_vol_info(const struct ubi_volume *vol)
 	printf("\tlast_eb_bytes   %d\n", vol->last_eb_bytes);
 	printf("\tcorrupted       %d\n", vol->corrupted);
 	printf("\tupd_marker      %d\n", vol->upd_marker);
+	printf("\tskip_check      %d\n", vol->skip_check);
 
 	if (vol->name_len <= UBI_VOL_NAME_MAX &&
 	    strnlen(vol->name, vol->name_len + 1) == vol->name_len) {
diff --git a/drivers/mtd/ubi/kapi.c b/drivers/mtd/ubi/kapi.c
index 2e171b0209..bcea71b1b2 100644
--- a/drivers/mtd/ubi/kapi.c
+++ b/drivers/mtd/ubi/kapi.c
@@ -196,7 +196,7 @@ struct ubi_volume_desc *ubi_open_volume(int ubi_num, int vol_id, int mode)
 	desc->mode = mode;
 
 	mutex_lock(&ubi->ckvol_mutex);
-	if (!vol->checked) {
+	if (!vol->checked && !vol->skip_check) {
 		/* This is the first open - check the volume */
 		err = ubi_check_volume(ubi, vol_id);
 		if (err < 0) {
diff --git a/drivers/mtd/ubi/ubi-media.h b/drivers/mtd/ubi/ubi-media.h
index bd7a580961..4af85c4247 100644
--- a/drivers/mtd/ubi/ubi-media.h
+++ b/drivers/mtd/ubi/ubi-media.h
@@ -48,6 +48,11 @@ enum {
  * Volume flags used in the volume table record.
  *
  * @UBI_VTBL_AUTORESIZE_FLG: auto-resize this volume
+ * @UBI_VTBL_SKIP_CRC_CHECK_FLG: skip the CRC check done on a static volume at
+ *				 open time. Should only be set on volumes that
+ *				 are used by upper layers doing this kind of
+ *				 check. Main use-case for this flag is
+ *				 boot-time reduction
  *
  * %UBI_VTBL_AUTORESIZE_FLG flag can be set only for one volume in the volume
  * table. UBI automatically re-sizes the volume which has this flag and makes
@@ -79,6 +84,7 @@ enum {
  */
 enum {
 	UBI_VTBL_AUTORESIZE_FLG = 0x01,
+	UBI_VTBL_SKIP_CRC_CHECK_FLG = 0x02,
 };
 
 /*
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 918d03590c..f44960186b 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -293,6 +293,9 @@ struct ubi_fm_pool {
  *           atomic LEB change
  *
  * @eba_tbl: EBA table of this volume (LEB->PEB mapping)
+ * @skip_check: %1 if CRC check of this static volume should be skipped.
+ *		Directly reflects the presence of the
+ *		%UBI_VTBL_SKIP_CRC_CHECK_FLG flag in the vtbl entry
  * @checked: %1 if this static volume was checked
  * @corrupted: %1 if the volume is corrupted (static volumes only)
  * @upd_marker: %1 if the update marker is set for this volume
@@ -341,6 +344,7 @@ struct ubi_volume {
 	void *upd_buf;
 
 	int *eba_tbl;
+	unsigned int skip_check:1;
 	unsigned int checked:1;
 	unsigned int corrupted:1;
 	unsigned int upd_marker:1;
diff --git a/drivers/mtd/ubi/vmt.c b/drivers/mtd/ubi/vmt.c
index 94c8a98d47..a2ff1b5769 100644
--- a/drivers/mtd/ubi/vmt.c
+++ b/drivers/mtd/ubi/vmt.c
@@ -162,6 +162,9 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
 	if (!vol)
 		return -ENOMEM;
 
+	if (req->flags & UBI_VOL_SKIP_CRC_CHECK_FLG)
+		vol->skip_check = 1;
+
 	spin_lock(&ubi->volumes_lock);
 	if (vol_id == UBI_VOL_NUM_AUTO) {
 		/* Find unused volume ID */
@@ -295,6 +298,10 @@ int ubi_create_volume(struct ubi_device *ubi, struct ubi_mkvol_req *req)
 		vtbl_rec.vol_type = UBI_VID_DYNAMIC;
 	else
 		vtbl_rec.vol_type = UBI_VID_STATIC;
+
+	if (vol->skip_check)
+		vtbl_rec.flags |= UBI_VTBL_SKIP_CRC_CHECK_FLG;
+
 	memcpy(vtbl_rec.name, vol->name, vol->name_len);
 
 	err = ubi_change_vtbl_record(ubi, vol_id, &vtbl_rec);
@@ -738,6 +745,11 @@ static int self_check_volume(struct ubi_device *ubi, int vol_id)
 			ubi_err(ubi, "bad used_bytes");
 			goto fail;
 		}
+
+		if (vol->skip_check) {
+			ubi_err(ubi, "bad skip_check");
+			goto fail;
+		}
 	} else {
 		if (vol->used_ebs < 0 || vol->used_ebs > vol->reserved_pebs) {
 			ubi_err(ubi, "bad used_ebs");
diff --git a/drivers/mtd/ubi/vtbl.c b/drivers/mtd/ubi/vtbl.c
index fe96d3a894..fb535c1a87 100644
--- a/drivers/mtd/ubi/vtbl.c
+++ b/drivers/mtd/ubi/vtbl.c
@@ -554,6 +554,9 @@ static int init_volumes(struct ubi_device *ubi,
 		vol->name[vol->name_len] = '\0';
 		vol->vol_id = i;
 
+		if (vtbl[i].flags & UBI_VTBL_SKIP_CRC_CHECK_FLG)
+			vol->skip_check = 1;
+
 		if (vtbl[i].flags & UBI_VTBL_AUTORESIZE_FLG) {
 			/* Auto re-size flag may be set only for one volume */
 			if (ubi->autoresize_vol_id != -1) {