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mtd: afs: refactor v1 partition parsing

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Return immediately if we are not finding a valid v1 partition
in afs_read_footer_v1(), invert scanning logic so we continue
to read image information on v1 if we found a footer. This is
needed for the logic we introduce to parse v2 footers.

Cc: Ryan Harkin <ryan.harkin@linaro.org>
Cc: Liviu Dudau <liviu.dudau@arm.com>
Signed-off-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
Linus Walleij 2015-10-15 15:08:47 +02:00 committed by Brian Norris
parent 9498440fff
commit d2fd05bb67
1 changed files with 16 additions and 19 deletions
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35
drivers/mtd/afs.c
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@ -87,25 +87,23 @@ afs_read_footer_v1(struct mtd_info *mtd, u_int *img_start, u_int *iis_start,
return ret;
}
ret = 1;
/*
* Does it contain the magic number?
*/
if (fs.signature != AFSV1_FOOTER_MAGIC)
ret = 0;
return 0;
/*
* Check the checksum.
*/
if (word_sum(&fs, sizeof(fs) / sizeof(u32)) != 0xffffffff)
ret = 0;
return 0;
/*
* Don't touch the SIB.
*/
if (fs.type == 2)
ret = 0;
return 0;
*iis_start = fs.image_info_base & mask;
*img_start = fs.image_start & mask;
@ -115,16 +113,16 @@ afs_read_footer_v1(struct mtd_info *mtd, u_int *img_start, u_int *iis_start,
* be located after the footer structure.
*/
if (*iis_start >= ptr)
ret = 0;
return 0;
/*
* Check the start of this image. The image
* data can not be located after this block.
*/
if (*img_start > off)
ret = 0;
return 0;
return ret;
return 1;
}
static int
@ -190,18 +188,17 @@ static int parse_afs_partitions(struct mtd_info *mtd,
ret = afs_read_footer_v1(mtd, &img_ptr, &iis_ptr, off, mask);
if (ret < 0)
break;
if (ret == 0)
continue;
if (ret) {
ret = afs_read_iis_v1(mtd, &iis, iis_ptr);
if (ret < 0)
break;
if (ret == 0)
continue;
ret = afs_read_iis_v1(mtd, &iis, iis_ptr);
if (ret < 0)
break;
if (ret == 0)
continue;
sz += sizeof(struct mtd_partition);
sz += strlen(iis.name) + 1;
idx += 1;
sz += sizeof(struct mtd_partition);
sz += strlen(iis.name) + 1;
idx += 1;
}
}
if (!sz)