mtd: Stop updating erase_info->state and calling mtd_erase_callback()

MTD users are no longer checking erase_info->state to determine if the
erase operation failed or succeeded. Moreover, mtd_erase_callback() is
now a NOP.

We can safely get rid of all mtd_erase_callback() calls and all
erase_info->state assignments. While at it, get rid of the
erase_info->state field, all MTD_ERASE_XXX definitions and the
mtd_erase_callback() function.

Signed-off-by: Boris Brezillon <boris.brezillon@bootlin.com>
Reviewed-by: Richard Weinberger <richard@nod.at>
Reviewed-by: Miquel Raynal <miquel.raynal@bootlin.com>
Acked-by: Bert Kenward <bkenward@solarflare.com>
---
Changes in v2:
- Address a few coding style issues (reported by Miquel)
- Remove comments that are no longer valid (reported by Miquel)

drivers/mtd/chips/cfi_cmdset_0001.c

@@ -1993,20 +1993,8 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip,
 
 static int cfi_intelext_erase_varsize(struct mtd_info *mtd, struct erase_info *instr)
 {
-	unsigned long ofs, len;
-	int ret;
-
-	ofs = instr->addr;
-	len = instr->len;
-
-	ret = cfi_varsize_frob(mtd, do_erase_oneblock, ofs, len, NULL);
-	if (ret)
-		return ret;
-
-	instr->state = MTD_ERASE_DONE;
-	mtd_erase_callback(instr);
-
-	return 0;
+	return cfi_varsize_frob(mtd, do_erase_oneblock, instr->addr,
+				instr->len, NULL);
 }
 
 static void cfi_intelext_sync (struct mtd_info *mtd)

drivers/mtd/chips/cfi_cmdset_0002.c

@@ -2415,20 +2415,8 @@ static int __xipram do_erase_oneblock(struct map_info *map, struct flchip *chip,
 
 static int cfi_amdstd_erase_varsize(struct mtd_info *mtd, struct erase_info *instr)
 {
-	unsigned long ofs, len;
-	int ret;
-
-	ofs = instr->addr;
-	len = instr->len;
-
-	ret = cfi_varsize_frob(mtd, do_erase_oneblock, ofs, len, NULL);
-	if (ret)
-		return ret;
-
-	instr->state = MTD_ERASE_DONE;
-	mtd_erase_callback(instr);
-
-	return 0;
+	return cfi_varsize_frob(mtd, do_erase_oneblock, instr->addr,
+				instr->len, NULL);
 }
 
 
@@ -2436,7 +2424,6 @@ static int cfi_amdstd_erase_chip(struct mtd_info *mtd, struct erase_info *instr)
 {
 	struct map_info *map = mtd->priv;
 	struct cfi_private *cfi = map->fldrv_priv;
-	int ret = 0;
 
 	if (instr->addr != 0)
 		return -EINVAL;
@@ -2444,14 +2431,7 @@ static int cfi_amdstd_erase_chip(struct mtd_info *mtd, struct erase_info *instr)
 	if (instr->len != mtd->size)
 		return -EINVAL;
 
-	ret = do_erase_chip(map, &cfi->chips[0]);
-	if (ret)
-		return ret;
-
-	instr->state = MTD_ERASE_DONE;
-	mtd_erase_callback(instr);
-
-	return 0;
+	return do_erase_chip(map, &cfi->chips[0]);
 }
 
 static int do_atmel_lock(struct map_info *map, struct flchip *chip,

drivers/mtd/chips/cfi_cmdset_0020.c

@@ -965,9 +965,6 @@ static int cfi_staa_erase_varsize(struct mtd_info *mtd,
 		}
 	}
 
-	instr->state = MTD_ERASE_DONE;
-	mtd_erase_callback(instr);
-
 	return 0;
 }
 

drivers/mtd/chips/map_ram.c

@@ -131,8 +131,6 @@ static int mapram_erase (struct mtd_info *mtd, struct erase_info *instr)
 	allff = map_word_ff(map);
 	for (i=0; i<instr->len; i += map_bankwidth(map))
 		map_write(map, allff, instr->addr + i);
-	instr->state = MTD_ERASE_DONE;
-	mtd_erase_callback(instr);
 	return 0;
 }
 

drivers/mtd/devices/bcm47xxsflash.c

@@ -68,7 +68,6 @@ static int bcm47xxsflash_poll(struct bcm47xxsflash *b47s, int timeout)
 static int bcm47xxsflash_erase(struct mtd_info *mtd, struct erase_info *erase)
 {
 	struct bcm47xxsflash *b47s = mtd->priv;
-	int err;
 
 	switch (b47s->type) {
 	case BCM47XXSFLASH_TYPE_ST:
@@ -89,13 +88,7 @@ static int bcm47xxsflash_erase(struct mtd_info *mtd, struct erase_info *erase)
 		break;
 	}
 
-	err = bcm47xxsflash_poll(b47s, HZ);
-	if (err)
-		erase->state = MTD_ERASE_FAILED;
-	else
-		erase->state = MTD_ERASE_DONE;
-
-	return err;
+	return bcm47xxsflash_poll(b47s, HZ);
 }
 
 static int bcm47xxsflash_read(struct mtd_info *mtd, loff_t from, size_t len,

drivers/mtd/devices/block2mtd.c

@@ -88,17 +88,12 @@ static int block2mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
 	size_t len = instr->len;
 	int err;
 
-	instr->state = MTD_ERASING;
 	mutex_lock(&dev->write_mutex);
 	err = _block2mtd_erase(dev, from, len);
 	mutex_unlock(&dev->write_mutex);
-	if (err) {
+	if (err)
 		pr_err("erase failed err = %d\n", err);
-		instr->state = MTD_ERASE_FAILED;
-	} else
-		instr->state = MTD_ERASE_DONE;
 
-	mtd_erase_callback(instr);
 	return err;
 }
 

drivers/mtd/devices/docg3.c

@@ -1191,39 +1191,27 @@ static int doc_erase(struct mtd_info *mtd, struct erase_info *info)
 {
 	struct docg3 *docg3 = mtd->priv;
 	uint64_t len;
-	int block0, block1, page, ret, ofs = 0;
+	int block0, block1, page, ret = 0, ofs = 0;
 
 	doc_dbg("doc_erase(from=%lld, len=%lld\n", info->addr, info->len);
 
-	info->state = MTD_ERASE_PENDING;
 	calc_block_sector(info->addr + info->len, &block0, &block1, &page,
 			  &ofs, docg3->reliable);
-	ret = -EINVAL;
 	if (info->addr + info->len > mtd->size || page || ofs)
-		goto reset_err;
+		return -EINVAL;
 
-	ret = 0;
 	calc_block_sector(info->addr, &block0, &block1, &page, &ofs,
 			  docg3->reliable);
 	mutex_lock(&docg3->cascade->lock);
 	doc_set_device_id(docg3, docg3->device_id);
 	doc_set_reliable_mode(docg3);
 	for (len = info->len; !ret && len > 0; len -= mtd->erasesize) {
-		info->state = MTD_ERASING;
 		ret = doc_erase_block(docg3, block0, block1);
 		block0 += 2;
 		block1 += 2;
 	}
 	mutex_unlock(&docg3->cascade->lock);
 
-	if (ret)
-		goto reset_err;
-
-	info->state = MTD_ERASE_DONE;
-	return 0;
-
-reset_err:
-	info->state = MTD_ERASE_FAILED;
 	return ret;
 }
 

drivers/mtd/devices/lart.c

@@ -414,10 +414,7 @@ static int flash_erase (struct mtd_info *mtd,struct erase_info *instr)
    while (len)
 	 {
 		if (!erase_block (addr))
-		  {
-			 instr->state = MTD_ERASE_FAILED;
 			 return (-EIO);
-		  }
 
 		addr += mtd->eraseregions[i].erasesize;
 		len -= mtd->eraseregions[i].erasesize;
@@ -425,9 +422,6 @@ static int flash_erase (struct mtd_info *mtd,struct erase_info *instr)
 		if (addr == mtd->eraseregions[i].offset + (mtd->eraseregions[i].erasesize * mtd->eraseregions[i].numblocks)) i++;
 	 }
 
-   instr->state = MTD_ERASE_DONE;
-   mtd_erase_callback(instr);
-
    return (0);
 }
 

drivers/mtd/devices/mtd_dataflash.c

@@ -220,10 +220,6 @@ static int dataflash_erase(struct mtd_info *mtd, struct erase_info *instr)
 	}
 	mutex_unlock(&priv->lock);
 
-	/* Inform MTD subsystem that erase is complete */
-	instr->state = MTD_ERASE_DONE;
-	mtd_erase_callback(instr);
-
 	return 0;
 }
 

drivers/mtd/devices/mtdram.c

@@ -60,8 +60,7 @@ static int ram_erase(struct mtd_info *mtd, struct erase_info *instr)
 	if (check_offs_len(mtd, instr->addr, instr->len))
 		return -EINVAL;
 	memset((char *)mtd->priv + instr->addr, 0xff, instr->len);
-	instr->state = MTD_ERASE_DONE;
-	mtd_erase_callback(instr);
+
 	return 0;
 }
 

drivers/mtd/devices/phram.c

@@ -39,13 +39,6 @@ static int phram_erase(struct mtd_info *mtd, struct erase_info *instr)
 
 	memset(start + instr->addr, 0xff, instr->len);
 
-	/*
-	 * This'll catch a few races. Free the thing before returning :)
-	 * I don't feel at all ashamed. This kind of thing is possible anyway
-	 * with flash, but unlikely.
-	 */
-	instr->state = MTD_ERASE_DONE;
-	mtd_erase_callback(instr);
 	return 0;
 }
 

drivers/mtd/devices/pmc551.c

@@ -184,12 +184,10 @@ static int pmc551_erase(struct mtd_info *mtd, struct erase_info *instr)
 	}
 
       out:
-	instr->state = MTD_ERASE_DONE;
 #ifdef CONFIG_MTD_PMC551_DEBUG
 	printk(KERN_DEBUG "pmc551_erase() done\n");
 #endif
 
-	mtd_erase_callback(instr);
 	return 0;
 }
 

drivers/mtd/devices/powernv_flash.c

@@ -175,19 +175,11 @@ static int powernv_flash_erase(struct mtd_info *mtd, struct erase_info *erase)
 {
 	int rc;
 
-	erase->state = MTD_ERASING;
-
-	/* todo: register our own notifier to do a true async implementation */
 	rc =  powernv_flash_async_op(mtd, FLASH_OP_ERASE, erase->addr,
 			erase->len, NULL, NULL);
-
-	if (rc) {
+	if (rc)
 		erase->fail_addr = erase->addr;
-		erase->state = MTD_ERASE_FAILED;
-	} else {
-		erase->state = MTD_ERASE_DONE;
-	}
-	mtd_erase_callback(erase);
+
 	return rc;
 }
 

drivers/mtd/devices/slram.c

@@ -84,12 +84,7 @@ static int slram_erase(struct mtd_info *mtd, struct erase_info *instr)
 	slram_priv_t *priv = mtd->priv;
 
 	memset(priv->start + instr->addr, 0xff, instr->len);
-	/* This'll catch a few races. Free the thing before returning :)
-	 * I don't feel at all ashamed. This kind of thing is possible anyway
-	 * with flash, but unlikely.
-	 */
-	instr->state = MTD_ERASE_DONE;
-	mtd_erase_callback(instr);
+
 	return(0);
 }
 

drivers/mtd/devices/spear_smi.c

@@ -518,7 +518,6 @@ static int spear_mtd_erase(struct mtd_info *mtd, struct erase_info *e_info)
 		/* preparing the command for flash */
 		ret = spear_smi_erase_sector(dev, bank, command, 4);
 		if (ret) {
-			e_info->state = MTD_ERASE_FAILED;
 			mutex_unlock(&flash->lock);
 			return ret;
 		}
@@ -527,8 +526,6 @@ static int spear_mtd_erase(struct mtd_info *mtd, struct erase_info *e_info)
 	}
 
 	mutex_unlock(&flash->lock);
-	e_info->state = MTD_ERASE_DONE;
-	mtd_erase_callback(e_info);
 
 	return 0;
 }

drivers/mtd/devices/sst25l.c

@@ -195,7 +195,6 @@ static int sst25l_erase(struct mtd_info *mtd, struct erase_info *instr)
 		err = sst25l_erase_sector(flash, addr);
 		if (err) {
 			mutex_unlock(&flash->lock);
-			instr->state = MTD_ERASE_FAILED;
 			dev_err(&flash->spi->dev, "Erase failed\n");
 			return err;
 		}
@@ -205,8 +204,6 @@ static int sst25l_erase(struct mtd_info *mtd, struct erase_info *instr)
 
 	mutex_unlock(&flash->lock);
 
-	instr->state = MTD_ERASE_DONE;
-	mtd_erase_callback(instr);
 	return 0;
 }
 

drivers/mtd/devices/st_spi_fsm.c

@@ -1825,13 +1825,9 @@ static int stfsm_mtd_erase(struct mtd_info *mtd, struct erase_info *instr)
 
 	mutex_unlock(&fsm->lock);
 
-	instr->state = MTD_ERASE_DONE;
-	mtd_erase_callback(instr);
-
 	return 0;
 
 out1:
-	instr->state = MTD_ERASE_FAILED;
 	mutex_unlock(&fsm->lock);
 
 	return ret;

drivers/mtd/lpddr/lpddr2_nvm.c

@@ -380,14 +380,8 @@ static int lpddr2_nvm_write(struct mtd_info *mtd, loff_t start_add,
  */
 static int lpddr2_nvm_erase(struct mtd_info *mtd, struct erase_info *instr)
 {
-	int ret = lpddr2_nvm_do_block_op(mtd, instr->addr, instr->len,
+	return lpddr2_nvm_do_block_op(mtd, instr->addr, instr->len,
 				      LPDDR2_NVM_ERASE);
-	if (!ret) {
-		instr->state = MTD_ERASE_DONE;
-		mtd_erase_callback(instr);
-	}
-
-	return ret;
 }
 
 /*

drivers/mtd/lpddr/lpddr_cmds.c

@@ -693,8 +693,6 @@ static int lpddr_erase(struct mtd_info *mtd, struct erase_info *instr)
 		ofs += size;
 		len -= size;
 	}
-	instr->state = MTD_ERASE_DONE;
-	mtd_erase_callback(instr);
 
 	return 0;
 }

drivers/mtd/mtdconcat.c

@@ -446,7 +446,6 @@ static int concat_erase(struct mtd_info *mtd, struct erase_info *instr)
 		erase->addr = 0;
 		offset += subdev->size;
 	}
-	instr->state = erase->state;
 	kfree(erase);
 
 	return err;