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mtd: rawnand: make subop helpers return unsigned values 

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: 8878b126df ("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>
This commit is contained in:
Miquel Raynal 2018-07-19 00:09:12 +02:00
parent d166541e90
commit 760c435e0f
2 changed files with 30 additions and 30 deletions
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44
drivers/mtd/nand/raw/nand_base.c
View File

@ -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);

16
include/linux/mtd/rawnand.h
View File

@ -1007,14 +1007,14 @@ 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