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Date: Wed, 6 Nov 2019 14:49:10 +0530
From: Vignesh Raghavendra <vigneshr@...com>
To: <Tudor.Ambarus@...rochip.com>, <boris.brezillon@...labora.com>
CC: <miquel.raynal@...tlin.com>, <richard@....at>,
<linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 03/20] mtd: spi-nor: Check for errors after each
Register Operation
On 02/11/19 4:53 PM, Tudor.Ambarus@...rochip.com wrote:
> From: Tudor Ambarus <tudor.ambarus@...rochip.com>
>
> Check for the return vales of each Register Operation.
>
> Signed-off-by: Tudor Ambarus <tudor.ambarus@...rochip.com>
> ---
Reviewed-by: Vignesh Raghavendra <vigneshr@...com>
Regards
Vignesh
> 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 0cb3122e74ad..5debb0f7ca13 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)
> @@ -859,7 +867,9 @@ static int spi_nor_write_sr_cr(struct spi_nor *nor, const 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 =
> @@ -889,7 +899,10 @@ 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;
> @@ -1397,7 +1410,9 @@ 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)
> @@ -1452,7 +1467,9 @@ 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)
> @@ -1479,7 +1496,9 @@ 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)
> @@ -1500,7 +1519,7 @@ 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);
> @@ -1849,9 +1868,13 @@ 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)
> @@ -2022,7 +2045,9 @@ 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)
> @@ -2063,7 +2088,9 @@ 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)
> @@ -2680,7 +2707,9 @@ 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;
>
> @@ -2718,14 +2747,19 @@ 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);
> @@ -2735,8 +2769,10 @@ 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;
> @@ -2787,7 +2823,10 @@ 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;
>
--
Regards
Vignesh
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