aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/generic/pending-4.19/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/generic/pending-4.19/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch')
-rw-r--r--target/linux/generic/pending-4.19/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch97
1 files changed, 97 insertions, 0 deletions
diff --git a/target/linux/generic/pending-4.19/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch b/target/linux/generic/pending-4.19/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch
new file mode 100644
index 0000000000..992aa4662e
--- /dev/null
+++ b/target/linux/generic/pending-4.19/490-ubi-auto-attach-mtd-device-named-ubi-or-data-on-boot.patch
@@ -0,0 +1,97 @@
+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
+@@ -1172,6 +1172,73 @@ 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;
+@@ -1255,6 +1322,12 @@ 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);