1 --- a/drivers/mtd/mtdpart.c
2 +++ b/drivers/mtd/mtdpart.c
3 @@ -446,14 +446,12 @@ static struct mtd_part *allocate_partiti
4 if (slave->offset == MTDPART_OFS_APPEND)
5 slave->offset = cur_offset;
6 if (slave->offset == MTDPART_OFS_NXTBLK) {
7 - slave->offset = cur_offset;
8 - if (mtd_mod_by_eb(cur_offset, master) != 0) {
9 - /* Round up to next erasesize */
10 - slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize;
11 + /* Round up to next erasesize */
12 + slave->offset = mtd_roundup_to_eb(cur_offset, master);
13 + if (slave->offset != cur_offset)
14 printk(KERN_NOTICE "Moving partition %d: "
15 "0x%012llx -> 0x%012llx\n", partno,
16 (unsigned long long)cur_offset, (unsigned long long)slave->offset);
19 if (slave->offset == MTDPART_OFS_RETAIN) {
20 slave->offset = cur_offset;
21 @@ -673,6 +671,17 @@ run_parsers_by_type(struct mtd_part *sla
25 +static inline unsigned long
26 +mtd_pad_erasesize(struct mtd_info *mtd, int offset, int len)
28 + unsigned long mask = mtd->erasesize - 1;
30 + len += offset & mask;
31 + len = (len + mask) & ~mask;
32 + len -= offset & mask;
36 #ifdef CONFIG_MTD_SPLIT_FIRMWARE_NAME
37 #define SPLIT_FIRMWARE_NAME CONFIG_MTD_SPLIT_FIRMWARE_NAME
39 @@ -956,6 +965,24 @@ int mtd_is_partition(const struct mtd_in
41 EXPORT_SYMBOL_GPL(mtd_is_partition);
43 +struct mtd_info *mtdpart_get_master(const struct mtd_info *mtd)
45 + if (!mtd_is_partition(mtd))
46 + return (struct mtd_info *)mtd;
48 + return PART(mtd)->master;
50 +EXPORT_SYMBOL_GPL(mtdpart_get_master);
52 +uint64_t mtdpart_get_offset(const struct mtd_info *mtd)
54 + if (!mtd_is_partition(mtd))
57 + return PART(mtd)->offset;
59 +EXPORT_SYMBOL_GPL(mtdpart_get_offset);
61 /* Returns the size of the entire flash chip */
62 uint64_t mtd_get_device_size(const struct mtd_info *mtd)
64 --- a/include/linux/mtd/partitions.h
65 +++ b/include/linux/mtd/partitions.h
66 @@ -90,6 +90,8 @@ int mtd_is_partition(const struct mtd_in
67 int mtd_add_partition(struct mtd_info *master, const char *name,
68 long long offset, long long length);
69 int mtd_del_partition(struct mtd_info *master, int partno);
70 +struct mtd_info *mtdpart_get_master(const struct mtd_info *mtd);
71 +uint64_t mtdpart_get_offset(const struct mtd_info *mtd);
72 uint64_t mtd_get_device_size(const struct mtd_info *mtd);
73 extern void __weak arch_split_mtd_part(struct mtd_info *master,
74 const char *name, int offset, int size);
75 --- a/include/linux/mtd/mtd.h
76 +++ b/include/linux/mtd/mtd.h
77 @@ -333,6 +333,24 @@ static inline uint32_t mtd_mod_by_eb(uin
78 return do_div(sz, mtd->erasesize);
81 +static inline uint64_t mtd_roundup_to_eb(uint64_t sz, struct mtd_info *mtd)
83 + if (mtd_mod_by_eb(sz, mtd) == 0)
86 + /* Round up to next erase block */
87 + return (mtd_div_by_eb(sz, mtd) + 1) * mtd->erasesize;
90 +static inline uint64_t mtd_rounddown_to_eb(uint64_t sz, struct mtd_info *mtd)
92 + if (mtd_mod_by_eb(sz, mtd) == 0)
95 + /* Round down to the start of the current erase block */
96 + return (mtd_div_by_eb(sz, mtd)) * mtd->erasesize;
99 static inline uint32_t mtd_div_by_ws(uint64_t sz, struct mtd_info *mtd)
101 if (mtd->writesize_shift)