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mtd: add fast path to mtd_write_page()

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If we overwrite a whole sector, don't perform a read-modify-write cycle.
This commit is contained in:
Benjamin Valentin 2023-02-06 15:46:34 +01:00
parent ebc869a83f
commit 44476137e3
1 changed files with 7 additions and 0 deletions
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7
drivers/mtd/mtd.c
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@ -183,6 +183,12 @@ static size_t _write_sector(mtd_dev_t *mtd, const void *data, uint32_t sector,
len = sector_size - offset;
}
/* fast path: skip reading the sector if we overwrite it completely */
if (offset == 0 && len == sector_size) {
work = (void *)data;
goto write;
}
/* copy sector to RAM */
res = mtd_read_page(mtd, work, sector_page, 0, sector_size);
if (res < 0) {
@ -198,6 +204,7 @@ static size_t _write_sector(mtd_dev_t *mtd, const void *data, uint32_t sector,
/* modify sector in RAM */
memcpy(work + offset, data, len);
write:
/* write back modified sector copy */
res = mtd_write_page_raw(mtd, work, sector_page, 0, sector_size);
if (res < 0) {