5.4-stable review patch. If anyone has any objections, please let me know.
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From: Geert Uytterhoeven geert+renesas@glider.be
commit 6792b7fce610bcd1cf3e07af3607fe7e2c38c1d8 upstream.
When the exact mapping type driver was not available, the old physmap_of_core driver fell back to mapping the region as ROM. Unfortunately this feature was lost when the DT and pdata cases were merged. Revive this useful feature.
Fixes: 642b1e8dbed7bbbf ("mtd: maps: Merge physmap_of.c into physmap-core.c") Signed-off-by: Geert Uytterhoeven geert+renesas@glider.be Signed-off-by: Miquel Raynal miquel.raynal@bootlin.com Link: https://lore.kernel.org/linux-mtd/550e8c8c1da4c4baeb3d71ff79b14a18d4194f9e.1... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/mtd/maps/physmap-core.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
--- a/drivers/mtd/maps/physmap-core.c +++ b/drivers/mtd/maps/physmap-core.c @@ -533,6 +533,17 @@ static int physmap_flash_probe(struct pl if (info->probe_type) { info->mtds[i] = do_map_probe(info->probe_type, &info->maps[i]); + + /* Fall back to mapping region as ROM */ + if (!info->mtds[i] && IS_ENABLED(CONFIG_MTD_ROM) && + strcmp(info->probe_type, "map_rom")) { + dev_warn(&dev->dev, + "map_probe() failed for type %s\n", + info->probe_type); + + info->mtds[i] = do_map_probe("map_rom", + &info->maps[i]); + } } else { int j;