bcm53xx: add early support for kernel 4.14

Don't switch to it by default yet as it requires more testing.

Signed-off-by: Rafał Miłecki <rafal@milecki.pl>

1 files changed, 59 insertions, 0 deletions

diff --git a/target/linux/bcm53xx/patches-4.14/500-UBI-Detect-EOF-mark-and-erase-all-remaining-blocks.patch b/target/linux/bcm53xx/patches-4.14/500-UBI-Detect-EOF-mark-and-erase-all-remaining-blocks.patch
new file mode 100644
index 0000000..271d98c
--- /dev/null
+++ b/target/linux/bcm53xx/patches-4.14/500-UBI-Detect-EOF-mark-and-erase-all-remaining-blocks.patch
@@ -0,0 +1,59 @@
+From 2a2af518266a29323cf30c3f9ba9ef2ceb1dd84b Mon Sep 17 00:00:00 2001
+From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
+Date: Thu, 16 Oct 2014 20:52:16 +0200
+Subject: [PATCH] UBI: Detect EOF mark and erase all remaining blocks
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
+---
+ drivers/mtd/ubi/attach.c | 5 +++++
+ drivers/mtd/ubi/io.c     | 4 ++++
+ drivers/mtd/ubi/ubi.h    | 1 +
+ 3 files changed, 10 insertions(+)
+
+--- a/drivers/mtd/ubi/attach.c
++++ b/drivers/mtd/ubi/attach.c
+@@ -95,6 +95,9 @@ static int self_check_ai(struct ubi_devi
+ #define AV_ADD		BIT(1)
+ #define AV_FIND_OR_ADD	(AV_FIND | AV_ADD)
+ 
++/* Set on finding block with 0xdeadc0de, indicates erasing all blocks behind */
++bool erase_all_next;
++
+ /**
+  * find_or_add_av - internal function to find a volume, add a volume or do
+  *		    both (find and add if missing).
+@@ -1592,6 +1595,8 @@ int ubi_attach(struct ubi_device *ubi, i
+ 	if (!ai)
+ 		return -ENOMEM;
+ 
++	erase_all_next = false;
++
+ #ifdef CONFIG_MTD_UBI_FASTMAP
+ 	/* On small flash devices we disable fastmap in any case. */
+ 	if ((int)mtd_div_by_eb(ubi->mtd->size, ubi->mtd) <= UBI_FM_MAX_START) {
+--- a/drivers/mtd/ubi/io.c
++++ b/drivers/mtd/ubi/io.c
+@@ -759,6 +759,10 @@ int ubi_io_read_ec_hdr(struct ubi_device
+ 	}
+ 
+ 	magic = be32_to_cpu(ec_hdr->magic);
++	if (magic == 0xdeadc0de)
++		erase_all_next = true;
++	if (erase_all_next)
++		return read_err ? UBI_IO_FF_BITFLIPS : UBI_IO_FF;
+ 	if (magic != UBI_EC_HDR_MAGIC) {
+ 		if (mtd_is_eccerr(read_err))
+ 			return UBI_IO_BAD_HDR_EBADMSG;
+--- a/drivers/mtd/ubi/ubi.h
++++ b/drivers/mtd/ubi/ubi.h
+@@ -822,6 +822,7 @@ extern struct mutex ubi_devices_mutex;
+ extern struct blocking_notifier_head ubi_notifiers;
+ 
+ /* attach.c */
++extern bool erase_all_next;
+ struct ubi_ainf_peb *ubi_alloc_aeb(struct ubi_attach_info *ai, int pnum,
+ 				   int ec);
+ void ubi_free_aeb(struct ubi_attach_info *ai, struct ubi_ainf_peb *aeb);