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Subject[PATCH AUTOSEL 4.18 058/131] mtd: rawnand: make subop helpers return unsigned values
Date
From: Miquel Raynal <miquel.raynal@bootlin.com>

[ Upstream commit 760c435e0f85ed19e48a90d746ce1de2cd02def7 ]

A report from Colin Ian King pointed a CoverityScan issue where error
values on these helpers where not checked in the drivers. These
helpers can error out only in case of a software bug in driver code,
not because of a runtime/hardware error. Hence, let's WARN_ON() in this
case and return 0 which is harmless anyway.

Fixes: 8878b126df76 ("mtd: nand: add ->exec_op() implementation")
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Boris Brezillon <boris.brezillon@bootlin.com>
Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
drivers/mtd/nand/raw/nand_base.c | 44 ++++++++++++++++----------------
include/linux/mtd/rawnand.h | 16 ++++++------
2 files changed, 30 insertions(+), 30 deletions(-)

diff --git a/drivers/mtd/nand/raw/nand_base.c b/drivers/mtd/nand/raw/nand_base.c
index b01d15ec4c56..3e3e6a8f1abc 100644
--- a/drivers/mtd/nand/raw/nand_base.c
+++ b/drivers/mtd/nand/raw/nand_base.c
@@ -2668,8 +2668,8 @@ static bool nand_subop_instr_is_valid(const struct nand_subop *subop,
return subop && instr_idx < subop->ninstrs;
}

-static int nand_subop_get_start_off(const struct nand_subop *subop,
- unsigned int instr_idx)
+static unsigned int nand_subop_get_start_off(const struct nand_subop *subop,
+ unsigned int instr_idx)
{
if (instr_idx)
return 0;
@@ -2688,12 +2688,12 @@ static int nand_subop_get_start_off(const struct nand_subop *subop,
*
* Given an address instruction, returns the offset of the first cycle to issue.
*/
-int nand_subop_get_addr_start_off(const struct nand_subop *subop,
- unsigned int instr_idx)
+unsigned int nand_subop_get_addr_start_off(const struct nand_subop *subop,
+ unsigned int instr_idx)
{
- if (!nand_subop_instr_is_valid(subop, instr_idx) ||
- subop->instrs[instr_idx].type != NAND_OP_ADDR_INSTR)
- return -EINVAL;
+ if (WARN_ON(!nand_subop_instr_is_valid(subop, instr_idx) ||
+ subop->instrs[instr_idx].type != NAND_OP_ADDR_INSTR))
+ return 0;

return nand_subop_get_start_off(subop, instr_idx);
}
@@ -2710,14 +2710,14 @@ EXPORT_SYMBOL_GPL(nand_subop_get_addr_start_off);
*
* Given an address instruction, returns the number of address cycle to issue.
*/
-int nand_subop_get_num_addr_cyc(const struct nand_subop *subop,
- unsigned int instr_idx)
+unsigned int nand_subop_get_num_addr_cyc(const struct nand_subop *subop,
+ unsigned int instr_idx)
{
int start_off, end_off;

- if (!nand_subop_instr_is_valid(subop, instr_idx) ||
- subop->instrs[instr_idx].type != NAND_OP_ADDR_INSTR)
- return -EINVAL;
+ if (WARN_ON(!nand_subop_instr_is_valid(subop, instr_idx) ||
+ subop->instrs[instr_idx].type != NAND_OP_ADDR_INSTR))
+ return 0;

start_off = nand_subop_get_addr_start_off(subop, instr_idx);

@@ -2742,12 +2742,12 @@ EXPORT_SYMBOL_GPL(nand_subop_get_num_addr_cyc);
*
* Given a data instruction, returns the offset to start from.
*/
-int nand_subop_get_data_start_off(const struct nand_subop *subop,
- unsigned int instr_idx)
+unsigned int nand_subop_get_data_start_off(const struct nand_subop *subop,
+ unsigned int instr_idx)
{
- if (!nand_subop_instr_is_valid(subop, instr_idx) ||
- !nand_instr_is_data(&subop->instrs[instr_idx]))
- return -EINVAL;
+ if (WARN_ON(!nand_subop_instr_is_valid(subop, instr_idx) ||
+ !nand_instr_is_data(&subop->instrs[instr_idx])))
+ return 0;

return nand_subop_get_start_off(subop, instr_idx);
}
@@ -2764,14 +2764,14 @@ EXPORT_SYMBOL_GPL(nand_subop_get_data_start_off);
*
* Returns the length of the chunk of data to send/receive.
*/
-int nand_subop_get_data_len(const struct nand_subop *subop,
- unsigned int instr_idx)
+unsigned int nand_subop_get_data_len(const struct nand_subop *subop,
+ unsigned int instr_idx)
{
int start_off = 0, end_off;

- if (!nand_subop_instr_is_valid(subop, instr_idx) ||
- !nand_instr_is_data(&subop->instrs[instr_idx]))
- return -EINVAL;
+ if (WARN_ON(!nand_subop_instr_is_valid(subop, instr_idx) ||
+ !nand_instr_is_data(&subop->instrs[instr_idx])))
+ return 0;

start_off = nand_subop_get_data_start_off(subop, instr_idx);

diff --git a/include/linux/mtd/rawnand.h b/include/linux/mtd/rawnand.h
index 3e8ec3b8a39c..87c635d6c773 100644
--- a/include/linux/mtd/rawnand.h
+++ b/include/linux/mtd/rawnand.h
@@ -986,14 +986,14 @@ struct nand_subop {
unsigned int last_instr_end_off;
};

-int nand_subop_get_addr_start_off(const struct nand_subop *subop,
- unsigned int op_id);
-int nand_subop_get_num_addr_cyc(const struct nand_subop *subop,
- unsigned int op_id);
-int nand_subop_get_data_start_off(const struct nand_subop *subop,
- unsigned int op_id);
-int nand_subop_get_data_len(const struct nand_subop *subop,
- unsigned int op_id);
+unsigned int nand_subop_get_addr_start_off(const struct nand_subop *subop,
+ unsigned int op_id);
+unsigned int nand_subop_get_num_addr_cyc(const struct nand_subop *subop,
+ unsigned int op_id);
+unsigned int nand_subop_get_data_start_off(const struct nand_subop *subop,
+ unsigned int op_id);
+unsigned int nand_subop_get_data_len(const struct nand_subop *subop,
+ unsigned int op_id);

/**
* struct nand_op_parser_addr_constraints - Constraints for address instructions
--
2.17.1
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