From 8a52e4100d7c3a4a1dfddfa02b8864a9b0068c13 Mon Sep 17 00:00:00 2001 From: Daniel Golle Date: Sat, 17 May 2014 03:36:18 +0200 Subject: [PATCH 1/5] ubi: auto-attach mtd device named "ubi" or "data" on boot To: openwrt-devel@lists.openwrt.org Signed-off-by: Daniel Golle --- drivers/mtd/ubi/build.c | 36 ++++++++++++++++++++++++++++++++++++ 1 file changed, 36 insertions(+) --- a/drivers/mtd/ubi/build.c +++ b/drivers/mtd/ubi/build.c @@ -1213,6 +1213,48 @@ 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; + + /* 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)) { + size_t len; + char magic[4]; + + /* check for a valid ubi magic */ + err = mtd_read(mtd, 0, 4, &len, (void *) magic); + if (!err && len == 4 && strncmp(magic, "UBI#", 4)) { + pr_err("UBI error: no valid UBI magic found inside mtd%d", mtd->index); + put_mtd_device(mtd); + return; + } + + /* auto-add only media types where UBI makes sense */ + if (mtd->type == MTD_NANDFLASH || + mtd->type == MTD_DATAFLASH || + mtd->type == MTD_MLCNANDFLASH) { + mutex_lock(&ubi_devices_mutex); + pr_notice("UBI: auto-attach mtd%d", 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", mtd->index); + put_mtd_device(mtd); + } + } + } +} + static int __init ubi_init(void) { int err, i, k; @@ -1305,6 +1347,12 @@ 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 (config_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", err);