ubi: Replace erase_block() with sync_erase()

Since erase_block() has same logic with sync_erase(), just replace it
with sync_erase(), also rename 'sync_erase()' to 'ubi_sync_erase()'.
Signed-off-by: Zhihao Cheng <chengzhihao1@huawei.com>
Signed-off-by: Richard Weinberger <richard@nod.at>

drivers/mtd/ubi/fastmap.c

@@ -1389,50 +1389,6 @@ static int ubi_write_fastmap(struct ubi_device *ubi,
 	return ret;
 }
 
-/**
- * erase_block - Manually erase a PEB.
- * @ubi: UBI device object
- * @e: the physical eraseblock to erase
- *
- * This function returns zero in case of success and a negative error code in
- * case of failure.
- */
-static int erase_block(struct ubi_device *ubi, struct ubi_wl_entry *e)
-{
-	int err;
-	struct ubi_ec_hdr *ec_hdr;
-	long long ec = e->ec;
-
-	ec_hdr = kzalloc(ubi->ec_hdr_alsize, GFP_NOFS);
-	if (!ec_hdr)
-		return -ENOMEM;
-
-	err = ubi_io_sync_erase(ubi, e->pnum, 0);
-	if (err < 0)
-		goto out;
-
-	ec += err;
-	if (ec > UBI_MAX_ERASECOUNTER) {
-		err = -EINVAL;
-		goto out;
-	}
-
-	ec_hdr->ec = cpu_to_be64(ec);
-	err = ubi_io_write_ec_hdr(ubi, e->pnum, ec_hdr);
-	if (err < 0)
-		goto out;
-
-	e->ec = ec;
-	spin_lock(&ubi->wl_lock);
-	if (e->ec > ubi->max_ec)
-		ubi->max_ec = e->ec;
-	spin_unlock(&ubi->wl_lock);
-
-out:
-	kfree(ec_hdr);
-	return err;
-}
-
 /**
  * invalidate_fastmap - destroys a fastmap.
  * @ubi: UBI device object
@@ -1573,7 +1529,7 @@ int ubi_update_fastmap(struct ubi_device *ubi)
 
 		if (!tmp_e) {
 			if (old_fm && old_fm->e[i]) {
-				ret = erase_block(ubi, old_fm->e[i]);
+				ret = ubi_sync_erase(ubi, old_fm->e[i], 0);
 				if (ret < 0) {
 					ubi_err(ubi, "could not erase old fastmap PEB");
 
@@ -1625,7 +1581,7 @@ int ubi_update_fastmap(struct ubi_device *ubi)
 	if (old_fm) {
 		/* no fresh anchor PEB was found, reuse the old one */
 		if (!tmp_e) {
-			ret = erase_block(ubi, old_fm->e[0]);
+			ret = ubi_sync_erase(ubi, old_fm->e[0], 0);
 			if (ret < 0) {
 				ubi_err(ubi, "could not erase old anchor PEB");
 

drivers/mtd/ubi/ubi.h

@@ -902,6 +902,7 @@ int self_check_eba(struct ubi_device *ubi, struct ubi_attach_info *ai_fastmap,
 		   struct ubi_attach_info *ai_scan);
 
 /* wl.c */
+int ubi_sync_erase(struct ubi_device *ubi, struct ubi_wl_entry *e, int torture);
 int ubi_wl_get_peb(struct ubi_device *ubi);
 int ubi_wl_put_peb(struct ubi_device *ubi, int vol_id, int lnum,
 		   int pnum, int torture);

drivers/mtd/ubi/wl.c

@@ -427,7 +427,7 @@ static int prot_queue_del(struct ubi_device *ubi, int pnum)
 }
 
 /**
- * sync_erase - synchronously erase a physical eraseblock.
+ * ubi_sync_erase - synchronously erase a physical eraseblock.
  * @ubi: UBI device description object
  * @e: the physical eraseblock to erase
  * @torture: if the physical eraseblock has to be tortured
@@ -435,8 +435,7 @@ static int prot_queue_del(struct ubi_device *ubi, int pnum)
  * This function returns zero in case of success and a negative error code in
  * case of failure.
  */
-static int sync_erase(struct ubi_device *ubi, struct ubi_wl_entry *e,
-		      int torture)
+int ubi_sync_erase(struct ubi_device *ubi, struct ubi_wl_entry *e, int torture)
 {
 	int err;
 	struct ubi_ec_hdr *ec_hdr;
@@ -1094,7 +1093,7 @@ static int __erase_worker(struct ubi_device *ubi, struct ubi_work *wl_wrk)
 	dbg_wl("erase PEB %d EC %d LEB %d:%d",
 	       pnum, e->ec, wl_wrk->vol_id, wl_wrk->lnum);
 
-	err = sync_erase(ubi, e, wl_wrk->torture);
+	err = ubi_sync_erase(ubi, e, wl_wrk->torture);
 	if (!err) {
 		spin_lock(&ubi->wl_lock);
 
@@ -1749,7 +1748,7 @@ static int erase_aeb(struct ubi_device *ubi, struct ubi_ainf_peb *aeb, bool sync
 	ubi->lookuptbl[e->pnum] = e;
 
 	if (sync) {
-		err = sync_erase(ubi, e, false);
+		err = ubi_sync_erase(ubi, e, false);
 		if (err)
 			goto out_free;