diff options
Diffstat (limited to 'target/linux/generic/pending-4.9/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch')
| -rw-r--r-- | target/linux/generic/pending-4.9/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch | 73 |
1 files changed, 73 insertions, 0 deletions
diff --git a/target/linux/generic/pending-4.9/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch b/target/linux/generic/pending-4.9/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch new file mode 100644 index 0000000000..a8dcad458f --- /dev/null +++ b/target/linux/generic/pending-4.9/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch @@ -0,0 +1,73 @@ +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 +@@ -1212,6 +1212,49 @@ 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_NORFLASH || ++ mtd->type == MTD_DATAFLASH || ++ mtd->type == MTD_MLCNANDFLASH) { ++ 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", mtd->index); ++ put_mtd_device(mtd); ++ } ++ } ++ } ++} ++ + static int __init ubi_init(void) + { + int err, i, k; +@@ -1295,6 +1338,12 @@ 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", err); |