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Merge #19252

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19252: mtd: add fast path to mtd_write_page() r=benpicco a=benpicco




Co-authored-by: Benjamin Valentin <benjamin.valentin@ml-pa.com>
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bors[bot] 2023-02-08 00:52:25 +00:00 committed by GitHub
commit f22ce155bb
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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; 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 */ /* copy sector to RAM */
res = mtd_read_page(mtd, work, sector_page, 0, sector_size); res = mtd_read_page(mtd, work, sector_page, 0, sector_size);
if (res < 0) { 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 */ /* modify sector in RAM */
memcpy(work + offset, data, len); memcpy(work + offset, data, len);
write:
/* write back modified sector copy */ /* write back modified sector copy */
res = mtd_write_page_raw(mtd, work, sector_page, 0, sector_size); res = mtd_write_page_raw(mtd, work, sector_page, 0, sector_size);
if (res < 0) { if (res < 0) {