[PATCH v3 15/32] mtd: spi-nor: Check for errors after each Register Operation

Tudor.Ambarus
2019-10-29T11:18:23Z

From: Tudor Ambarus <tudor.ambarus@microchip.com>

Check for the return vales of each Register Operation.

Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
---
drivers/mtd/spi-nor/spi-nor.c | 81 ++++++++++++++++++++++++++++++++-----------
1 file changed, 60 insertions(+), 21 deletions(-)

diff --git a/drivers/mtd/spi-nor/spi-nor.c b/drivers/mtd/spi-nor/spi-nor.c
index 889fd77dbe96..21f01fdcfa16 100644
--- a/drivers/mtd/spi-nor/spi-nor.c
+++ b/drivers/mtd/spi-nor/spi-nor.c
@@ -595,11 +595,15 @@ static int st_micron_set_4byte(struct spi_nor *nor, bool enable)
{
int ret;

- spi_nor_write_enable(nor);
+ ret == spi_nor_write_enable(nor);
+ if (ret)
+ return ret;
+
ret = macronix_set_4byte(nor, enable);
- spi_nor_write_disable(nor);
+ if (ret)
+ return ret;

- return ret;
+ return spi_nor_write_disable(nor);
}

static int spansion_set_4byte(struct spi_nor *nor, bool enable)
@@ -665,11 +669,15 @@ static int winbond_set_4byte(struct spi_nor *nor, bool enable)
* Register to be set to 1, so all 3-byte-address reads come from the
* second 16M. We must clear the register to enable normal behavior.
*/
- spi_nor_write_enable(nor);
+ ret = spi_nor_write_enable(nor);
+ if (ret)
+ return ret;
+
ret = spi_nor_write_ear(nor, 0);
- spi_nor_write_disable(nor);
+ if (ret)
+ return ret;

- return ret;
+ return spi_nor_write_disable(nor);
}

static int spi_nor_xread_sr(struct spi_nor *nor, u8 *sr)
@@ -855,7 +863,9 @@ static int spi_nor_write_sr_cr(struct spi_nor *nor, u8 *sr_cr)
{
int ret;

- spi_nor_write_enable(nor);
+ ret = spi_nor_write_enable(nor);
+ if (ret)
+ return ret;

if (nor->spimem) {
struct spi_mem_op op =
@@ -885,7 +895,10 @@ static int spi_nor_write_sr_and_check(struct spi_nor *nor, u8 status_new,
{
int ret;

- spi_nor_write_enable(nor);
+ ret = spi_nor_write_enable(nor);
+ if (ret)
+ return ret;
+
ret = spi_nor_write_sr(nor, status_new);
if (ret)
return ret;
@@ -1393,7 +1406,9 @@ static int spi_nor_erase_multi_sectors(struct spi_nor *nor, u64 addr, u32 len)
list_for_each_entry_safe(cmd, next, &erase_list, list) {
nor->erase_opcode = cmd->opcode;
while (cmd->count) {
- spi_nor_write_enable(nor);
+ ret = spi_nor_write_enable(nor);
+ if (ret)
+ goto destroy_erase_cmd_list;

ret = spi_nor_erase_sector(nor, addr);
if (ret)
@@ -1448,7 +1463,9 @@ static int spi_nor_erase(struct mtd_info *mtd, struct erase_info *instr)
if (len == mtd->size && !(nor->flags & SNOR_F_NO_OP_CHIP_ERASE)) {
unsigned long timeout;

- spi_nor_write_enable(nor);
+ ret = spi_nor_write_enable(nor);
+ if (ret)
+ goto erase_err;

ret = spi_nor_erase_chip(nor);
if (ret)
@@ -1475,7 +1492,9 @@ static int spi_nor_erase(struct mtd_info *mtd, struct erase_info *instr)
/* "sector"-at-a-time erase */
} else if (spi_nor_has_uniform_erase(nor)) {
while (len) {
- spi_nor_write_enable(nor);
+ ret = spi_nor_write_enable(nor);
+ if (ret)
+ goto erase_err;

ret = spi_nor_erase_sector(nor, addr);
if (ret)
@@ -1496,7 +1515,7 @@ static int spi_nor_erase(struct mtd_info *mtd, struct erase_info *instr)
goto erase_err;
}

- spi_nor_write_disable(nor);
+ ret = spi_nor_write_disable(nor);

erase_err:
spi_nor_unlock_and_unprep(nor, SPI_NOR_OPS_ERASE);
@@ -1845,9 +1864,13 @@ static int macronix_quad_enable(struct spi_nor *nor)
if (nor->bouncebuf[0] & SR_QUAD_EN_MX)
return 0;

- spi_nor_write_enable(nor);
+ ret = spi_nor_write_enable(nor);
+ if (ret)
+ return ret;

- spi_nor_write_sr(nor, nor->bouncebuf[0] | SR_QUAD_EN_MX);
+ ret = spi_nor_write_sr(nor, nor->bouncebuf[0] | SR_QUAD_EN_MX);
+ if (ret)
+ return ret;

ret = spi_nor_wait_till_ready(nor);
if (ret)
@@ -2018,7 +2041,9 @@ static int sr2_bit7_quad_enable(struct spi_nor *nor)
/* Update the Quad Enable bit. */
*sr2 |= SR2_QUAD_EN_BIT7;

- spi_nor_write_enable(nor);
+ ret = spi_nor_write_enable(nor);
+ if (ret)
+ return ret;

ret = spi_nor_write_sr2(nor, sr2);
if (ret)
@@ -2059,7 +2084,9 @@ static int spi_nor_clear_sr_bp(struct spi_nor *nor)
if (ret)
return ret;

- spi_nor_write_enable(nor);
+ ret = spi_nor_write_enable(nor);
+ if (ret)
+ return ret;

ret = spi_nor_write_sr(nor, nor->bouncebuf[0] & ~mask);
if (ret)
@@ -2676,7 +2703,9 @@ static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
if (ret)
return ret;

- spi_nor_write_enable(nor);
+ ret = spi_nor_write_enable(nor);
+ if (ret)
+ goto sst_write_err;

nor->sst_write_second = false;

@@ -2714,14 +2743,19 @@ static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
}
nor->sst_write_second = false;

- spi_nor_write_disable(nor);
+ ret = spi_nor_write_disable(nor);
+ if (ret)
+ goto sst_write_err;
+
ret = spi_nor_wait_till_ready(nor);
if (ret)
goto sst_write_err;

/* Write out trailing byte if it exists. */
if (actual != len) {
- spi_nor_write_enable(nor);
+ ret = spi_nor_write_enable(nor);
+ if (ret)
+ goto sst_write_err;

nor->program_opcode = SPINOR_OP_BP;
ret = spi_nor_write_data(nor, to, 1, buf + actual);
@@ -2731,8 +2765,10 @@ static int sst_write(struct mtd_info *mtd, loff_t to, size_t len,
ret = spi_nor_wait_till_ready(nor);
if (ret)
goto sst_write_err;
- spi_nor_write_disable(nor);
+
actual += 1;
+
+ ret = spi_nor_write_disable(nor);
}
sst_write_err:
*retlen += actual;
@@ -2783,7 +2819,10 @@ static int spi_nor_write(struct mtd_info *mtd, loff_t to, size_t len,

addr = spi_nor_convert_addr(nor, addr);

- spi_nor_write_enable(nor);
+ ret = spi_nor_write_enable(nor);
+ if (ret)
+ goto write_err;
+
ret = spi_nor_write_data(nor, addr, page_remain, buf + i);
if (ret < 0)
goto write_err;
--
2.9.5