kernel: backport queued bcm47xxpart changes

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>

SVN-Revision: 44156

1 files changed, 95 insertions, 0 deletions

diff --git a/target/linux/generic/patches-3.18/041-mtd-bcm47xxpart-backports-from-3.20.patch b/target/linux/generic/patches-3.18/041-mtd-bcm47xxpart-backports-from-3.20.patch
new file mode 100644
index 0000000000..59180c2084
--- /dev/null
+++ b/target/linux/generic/patches-3.18/041-mtd-bcm47xxpart-backports-from-3.20.patch
@@ -0,0 +1,95 @@
+--- a/drivers/mtd/bcm47xxpart.c
++++ b/drivers/mtd/bcm47xxpart.c
+@@ -15,6 +15,8 @@
+ #include <linux/mtd/mtd.h>
+ #include <linux/mtd/partitions.h>
+ 
++#include <uapi/linux/magic.h>
++
+ /*
+  * NAND flash on Netgear R6250 was verified to contain 15 partitions.
+  * This will result in allocating too big array for some old devices, but the
+@@ -39,7 +41,8 @@
+ #define ML_MAGIC1			0x39685a42
+ #define ML_MAGIC2			0x26594131
+ #define TRX_MAGIC			0x30524448
+-#define SQSH_MAGIC			0x71736873	/* shsq */
++#define SHSQ_MAGIC			0x71736873	/* shsq (weird ZTE H218N endianness) */
++#define UBI_EC_MAGIC			0x23494255	/* UBI# */
+ 
+ struct trx_header {
+ 	uint32_t magic;
+@@ -50,7 +53,7 @@ struct trx_header {
+ 	uint32_t offset[3];
+ } __packed;
+ 
+-static void bcm47xxpart_add_part(struct mtd_partition *part, char *name,
++static void bcm47xxpart_add_part(struct mtd_partition *part, const char *name,
+ 				 u64 offset, uint32_t mask_flags)
+ {
+ 	part->name = name;
+@@ -58,6 +61,26 @@ static void bcm47xxpart_add_part(struct
+ 	part->mask_flags = mask_flags;
+ }
+ 
++static const char *bcm47xxpart_trx_data_part_name(struct mtd_info *master,
++						  size_t offset)
++{
++	uint32_t buf;
++	size_t bytes_read;
++
++	if (mtd_read(master, offset, sizeof(buf), &bytes_read,
++		     (uint8_t *)&buf) < 0) {
++		pr_err("mtd_read error while parsing (offset: 0x%X)!\n",
++			offset);
++		goto out_default;
++	}
++
++	if (buf == UBI_EC_MAGIC)
++		return "ubi";
++
++out_default:
++	return "rootfs";
++}
++
+ static int bcm47xxpart_parse(struct mtd_info *master,
+ 			     struct mtd_partition **pparts,
+ 			     struct mtd_part_parser_data *data)
+@@ -73,8 +96,12 @@ static int bcm47xxpart_parse(struct mtd_
+ 	int last_trx_part = -1;
+ 	int possible_nvram_sizes[] = { 0x8000, 0xF000, 0x10000, };
+ 
+-	if (blocksize <= 0x10000)
+-		blocksize = 0x10000;
++	/*
++	 * Some really old flashes (like AT45DB*) had smaller erasesize-s, but
++	 * partitions were aligned to at least 0x1000 anyway.
++	 */
++	if (blocksize < 0x1000)
++		blocksize = 0x1000;
+ 
+ 	/* Alloc */
+ 	parts = kzalloc(sizeof(struct mtd_partition) * BCM47XXPART_MAX_PARTS,
+@@ -186,8 +213,11 @@ static int bcm47xxpart_parse(struct mtd_
+ 			 * we want to have jffs2 (overlay) in the same mtd.
+ 			 */
+ 			if (trx->offset[i]) {
++				const char *name;
++
++				name = bcm47xxpart_trx_data_part_name(master, offset + trx->offset[i]);
+ 				bcm47xxpart_add_part(&parts[curr_part++],
+-						     "rootfs",
++						     name,
+ 						     offset + trx->offset[i],
+ 						     0);
+ 				i++;
+@@ -205,7 +235,8 @@ static int bcm47xxpart_parse(struct mtd_
+ 		}
+ 
+ 		/* Squashfs on devices not using TRX */
+-		if (buf[0x000 / 4] == SQSH_MAGIC) {
++		if (le32_to_cpu(buf[0x000 / 4]) == SQUASHFS_MAGIC ||
++		    buf[0x000 / 4] == SHSQ_MAGIC) {
+ 			bcm47xxpart_add_part(&parts[curr_part++], "rootfs",
+ 					     offset, 0);
+ 			continue;