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From: Daniel Golle <daniel@makrotopia.org>
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Subject: ubi: auto-attach mtd device named "ubi" or "data" on boot
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Signed-off-by: Daniel Golle <daniel@makrotopia.org>
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---
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drivers/mtd/ubi/build.c | 36 ++++++++++++++++++++++++++++++++++++
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1 file changed, 36 insertions(+)
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--- a/drivers/mtd/ubi/build.c
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+++ b/drivers/mtd/ubi/build.c
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@@ -1181,6 +1181,73 @@ static struct mtd_info * __init open_mtd
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return mtd;
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}
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+/*
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+ * This function tries attaching mtd partitions named either "ubi" or "data"
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+ * during boot.
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+ */
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+static void __init ubi_auto_attach(void)
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+{
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+ int err;
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+ struct mtd_info *mtd;
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+ loff_t offset = 0;
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+ size_t len;
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+ char magic[4];
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+
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+ /* try attaching mtd device named "ubi" or "data" */
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+ mtd = open_mtd_device("ubi");
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+ if (IS_ERR(mtd))
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+ mtd = open_mtd_device("data");
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+
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+ if (IS_ERR(mtd))
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+ return;
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+
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+ /* get the first not bad block */
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+ if (mtd_can_have_bb(mtd))
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+ while (mtd_block_isbad(mtd, offset)) {
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+ offset += mtd->erasesize;
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+
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+ if (offset > mtd->size) {
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+ pr_err("UBI error: Failed to find a non-bad "
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+ "block on mtd%d\n", mtd->index);
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+ goto cleanup;
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+ }
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+ }
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+
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+ /* check if the read from flash was successful */
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+ err = mtd_read(mtd, offset, 4, &len, (void *) magic);
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+ if ((err && !mtd_is_bitflip(err)) || len != 4) {
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+ pr_err("UBI error: unable to read from mtd%d\n", mtd->index);
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+ goto cleanup;
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+ }
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+
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+ /* check for a valid ubi magic */
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+ if (strncmp(magic, "UBI#", 4)) {
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+ pr_err("UBI error: no valid UBI magic found inside mtd%d\n", mtd->index);
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+ goto cleanup;
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+ }
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+
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+ /* don't auto-add media types where UBI doesn't makes sense */
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+ if (mtd->type != MTD_NANDFLASH &&
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+ mtd->type != MTD_NORFLASH &&
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+ mtd->type != MTD_DATAFLASH &&
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+ mtd->type != MTD_MLCNANDFLASH)
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+ goto cleanup;
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+
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+ mutex_lock(&ubi_devices_mutex);
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+ pr_notice("UBI: auto-attach mtd%d\n", mtd->index);
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+ err = ubi_attach_mtd_dev(mtd, UBI_DEV_NUM_AUTO, 0, 0);
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+ mutex_unlock(&ubi_devices_mutex);
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+ if (err < 0) {
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+ pr_err("UBI error: cannot attach mtd%d\n", mtd->index);
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+ goto cleanup;
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+ }
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+
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+ return;
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+
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+cleanup:
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+ put_mtd_device(mtd);
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+}
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+
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static int __init ubi_init(void)
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{
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int err, i, k;
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@@ -1264,6 +1331,12 @@ static int __init ubi_init(void)
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}
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}
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+ /* auto-attach mtd devices only if built-in to the kernel and no ubi.mtd
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+ * parameter was given */
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+ if (IS_ENABLED(CONFIG_MTD_ROOTFS_ROOT_DEV) &&
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+ !ubi_is_module() && !mtd_devs)
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+ ubi_auto_attach();
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+
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err = ubiblock_init();
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if (err) {
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pr_err("UBI error: block: cannot initialize, error %d\n", err);
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