[PATCH 1/5] mtd: nand: use usual return values for the ->erase() hook

Avoid using specific defined values for checking returned status of the
->erase() hook. Instead, use usual negative error values on failure,  
zero otherwise.

Signed-off-by: Miquel Raynal <redacted>
---
 drivers/mtd/nand/denali.c    | 2 +-
 drivers/mtd/nand/docg4.c     | 7 ++++++-
 drivers/mtd/nand/nand_base.c | 2 +-
 3 files changed, 8 insertions(+), 3 deletions(-)

diff --git a/drivers/mtd/nand/denali.c b/drivers/mtd/nand/denali.c
index 34008a02ddb0..3e19861a46c6 100644
--- a/drivers/mtd/nand/denali.c
+++ b/drivers/mtd/nand/denali.c

@@ -951,7 +951,7 @@ static int denali_erase(struct mtd_info *mtd, int page)
 	irq_status = denali_wait_for_irq(denali,
 					 INTR__ERASE_COMP | INTR__ERASE_FAIL);
 
-	return irq_status & INTR__ERASE_COMP ? 0 : NAND_STATUS_FAIL;
+	return irq_status & INTR__ERASE_COMP ? 0 : -EIO;
 }
 
 static int denali_setup_data_interface(struct mtd_info *mtd, int chipnr,

diff --git a/drivers/mtd/nand/docg4.c b/drivers/mtd/nand/docg4.c
index 2436cbc71662..45c01b4b34c7 100644
--- a/drivers/mtd/nand/docg4.c
+++ b/drivers/mtd/nand/docg4.c

@@ -900,6 +900,7 @@ static int docg4_erase_block(struct mtd_info *mtd, int page)
 	struct docg4_priv *doc = nand_get_controller_data(nand);
 	void __iomem *docptr = doc->virtadr;
 	uint16_t g4_page;
+	int status;
 
 	dev_dbg(doc->dev, "%s: page %04x\n", __func__, page);
 

@@ -939,7 +940,11 @@ static int docg4_erase_block(struct mtd_info *mtd, int page)
 	poll_status(doc);
 	write_nop(docptr);
 
-	return nand->waitfunc(mtd, nand);
+	status = nand->waitfunc(mtd, nand);
+	if (status < 0)
+		return status;
+
+	return status & NAND_STATUS_FAIL ? -EIO : 0;
 }
 
 static int write_page(struct mtd_info *mtd, struct nand_chip *nand,

diff --git a/drivers/mtd/nand/nand_base.c b/drivers/mtd/nand/nand_base.c
index 630048f5abdc..4d1f2bda6095 100644
--- a/drivers/mtd/nand/nand_base.c
+++ b/drivers/mtd/nand/nand_base.c

@@ -3077,7 +3077,7 @@ int nand_erase_nand(struct mtd_info *mtd, struct erase_info *instr,
 		status = chip->erase(mtd, page & chip->pagemask);
 
 		/* See if block erase succeeded */
-		if (status & NAND_STATUS_FAIL) {
+		if (status) {
 			pr_debug("%s: failed erase, page 0x%08x\n",
 					__func__, page);
 			instr->state = MTD_ERASE_FAILED;