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| author | Linus Walleij <linus.walleij@linaro.org> | 2019-05-02 16:30:30 +0200 |
|---|---|---|
| committer | Richard Weinberger <richard@nod.at> | 2019-05-06 21:48:46 +0200 |
| commit | 20700171929316ed88fdd11b3099518a0bd2f36e (patch) | |
| tree | 9fa87aa15c7afc017a9e3142fdc164a24eab8699 /drivers/mtd | |
| parent | 1fca1f6abb38a6c2a082c1df01601d0898454d7a (diff) | |
| download | linux-20700171929316ed88fdd11b3099518a0bd2f36e.tar.bz2 | |
mtd: afs: simplify partition detection
Instead of reading out the AFS footers twice, create a separate
function to just check if there is a footer or not. Rids a few
local variables and prepare us to join the actual parser into
one function.
Cc: Ryan Harkin <ryan.harkin@linaro.org>
Acked-by: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'drivers/mtd')
| -rw-r--r-- | drivers/mtd/parsers/afs.c | 33 |
1 files changed, 22 insertions, 11 deletions
diff --git a/drivers/mtd/parsers/afs.c b/drivers/mtd/parsers/afs.c index c489938cd665..ccc198818057 100644 --- a/drivers/mtd/parsers/afs.c +++ b/drivers/mtd/parsers/afs.c @@ -68,6 +68,26 @@ static u32 word_sum(void *words, int num) return sum; } +static bool afs_is_v1(struct mtd_info *mtd, u_int off) +{ + /* The magic is 12 bytes from the end of the erase block */ + u_int ptr = off + mtd->erasesize - 12; + u32 magic; + size_t sz; + int ret; + + ret = mtd_read(mtd, ptr, 4, &sz, (u_char *)&magic); + if (ret < 0) { + printk(KERN_ERR "AFS: mtd read failed at 0x%x: %d\n", + ptr, ret); + return false; + } + if (ret >= 0 && sz != 4) + return false; + + return (magic == AFSV1_FOOTER_MAGIC); +} + static int afs_read_footer_v1(struct mtd_info *mtd, u_int *img_start, u_int *iis_start, u_int off, u_int mask) @@ -176,18 +196,9 @@ static int parse_afs_partitions(struct mtd_info *mtd, */ mask = mtd->size - 1; - /* - * First, calculate the size of the array we need for the - * partition information. We include in this the size of - * the strings. - */ + /* Count the partitions by looping over all erase blocks */ for (i = off = sz = 0; off < mtd->size; off += mtd->erasesize) { - u_int iis_ptr, img_ptr; - - ret = afs_read_footer_v1(mtd, &img_ptr, &iis_ptr, off, mask); - if (ret < 0) - return ret; - if (ret) { + if (afs_is_v1(mtd, off)) { sz += sizeof(struct mtd_partition); i += 1; } |