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- From: Daniel Golle <daniel@makrotopia.org>
- Subject: ubi: auto-attach mtd device named "ubi" or "data" on boot
- Signed-off-by: Daniel Golle <daniel@makrotopia.org>
- ---
- drivers/mtd/ubi/build.c | 36 ++++++++++++++++++++++++++++++++++++
- 1 file changed, 36 insertions(+)
- --- a/drivers/mtd/ubi/build.c
- +++ b/drivers/mtd/ubi/build.c
- @@ -1171,6 +1171,73 @@ static struct mtd_info * __init open_mtd
- return mtd;
- }
-
- +/*
- + * This function tries attaching mtd partitions named either "ubi" or "data"
- + * during boot.
- + */
- +static void __init ubi_auto_attach(void)
- +{
- + int err;
- + struct mtd_info *mtd;
- + loff_t offset = 0;
- + size_t len;
- + char magic[4];
- +
- + /* try attaching mtd device named "ubi" or "data" */
- + mtd = open_mtd_device("ubi");
- + if (IS_ERR(mtd))
- + mtd = open_mtd_device("data");
- +
- + if (IS_ERR(mtd))
- + return;
- +
- + /* get the first not bad block */
- + if (mtd_can_have_bb(mtd))
- + while (mtd_block_isbad(mtd, offset)) {
- + offset += mtd->erasesize;
- +
- + if (offset > mtd->size) {
- + pr_err("UBI error: Failed to find a non-bad "
- + "block on mtd%d\n", mtd->index);
- + goto cleanup;
- + }
- + }
- +
- + /* check if the read from flash was successful */
- + err = mtd_read(mtd, offset, 4, &len, (void *) magic);
- + if ((err && !mtd_is_bitflip(err)) || len != 4) {
- + pr_err("UBI error: unable to read from mtd%d\n", mtd->index);
- + goto cleanup;
- + }
- +
- + /* check for a valid ubi magic */
- + if (strncmp(magic, "UBI#", 4)) {
- + pr_err("UBI error: no valid UBI magic found inside mtd%d\n", mtd->index);
- + goto cleanup;
- + }
- +
- + /* don't auto-add media types where UBI doesn't makes sense */
- + if (mtd->type != MTD_NANDFLASH &&
- + mtd->type != MTD_NORFLASH &&
- + mtd->type != MTD_DATAFLASH &&
- + mtd->type != MTD_MLCNANDFLASH)
- + goto cleanup;
- +
- + mutex_lock(&ubi_devices_mutex);
- + pr_notice("UBI: auto-attach mtd%d\n", mtd->index);
- + err = ubi_attach_mtd_dev(mtd, UBI_DEV_NUM_AUTO, 0, 0);
- + mutex_unlock(&ubi_devices_mutex);
- + if (err < 0) {
- + pr_err("UBI error: cannot attach mtd%d\n", mtd->index);
- + goto cleanup;
- + }
- +
- + return;
- +
- +cleanup:
- + put_mtd_device(mtd);
- +}
- +
- static int __init ubi_init(void)
- {
- int err, i, k;
- @@ -1254,6 +1321,12 @@ static int __init ubi_init(void)
- }
- }
-
- + /* auto-attach mtd devices only if built-in to the kernel and no ubi.mtd
- + * parameter was given */
- + if (IS_ENABLED(CONFIG_MTD_ROOTFS_ROOT_DEV) &&
- + !ubi_is_module() && !mtd_devs)
- + ubi_auto_attach();
- +
- err = ubiblock_init();
- if (err) {
- pr_err("UBI error: block: cannot initialize, error %d\n", err);
|
