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authorShmulik Ladkani <shmulik.ladkani@gmail.com>2012-09-05 09:30:20 +0400
committerDavid Woodhouse <David.Woodhouse@intel.com>2012-09-29 18:44:25 +0400
commit7baf04261062826ea225ab23e07c541e279143fa (patch)
tree8cb93944ca5a5d073d7eb6868e7f67374e614fa7 /drivers/mtd
parent2fe87aef33b77d66fada83f5dc57b6798ad5df07 (diff)
downloadlinux-7baf04261062826ea225ab23e07c541e279143fa.tar.xz
mtd: cmdlinepart: make the partitions rule more strict
Huang Shijie <shijie8@gmail.com> explains: Assume we have a 1GiB(8Gib) NAND chip, and we set the partitions in the command line like this: #gpmi-nand:100m(boot),100m(kernel),1g(rootfs) In this case, the partition truncating occurs. The current code will get the following result: ---------------------------------- root@freescale ~$ cat /proc/mtd dev: size erasesize name mtd0: 06400000 00040000 "boot" mtd1: 06400000 00040000 "kernel" ---------------------------------- It is obvious that we lost the truncated partition `rootfs` which should be 824MiB in this case. Also, forbid 0-sized partitions. Signed-off-by: Shmulik Ladkani <shmulik.ladkani@gmail.com> Signed-off-by: Artem Bityutskiy <artem.bityutskiy@linux.intel.com> Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
Diffstat (limited to 'drivers/mtd')
-rw-r--r--drivers/mtd/cmdlinepart.c12
1 files changed, 11 insertions, 1 deletions
diff --git a/drivers/mtd/cmdlinepart.c b/drivers/mtd/cmdlinepart.c
index 17b0bd463839..aed1b8a63c9f 100644
--- a/drivers/mtd/cmdlinepart.c
+++ b/drivers/mtd/cmdlinepart.c
@@ -319,12 +319,22 @@ static int parse_cmdline_partitions(struct mtd_info *master,
if (part->parts[i].size == SIZE_REMAINING)
part->parts[i].size = master->size - offset;
+ if (part->parts[i].size == 0) {
+ printk(KERN_WARNING ERRP
+ "%s: skipping zero sized partition\n",
+ part->mtd_id);
+ part->num_parts--;
+ memmove(&part->parts[i],
+ &part->parts[i + 1],
+ sizeof(*part->parts) * (part->num_parts - i));
+ continue;
+ }
+
if (offset + part->parts[i].size > master->size) {
printk(KERN_WARNING ERRP
"%s: partitioning exceeds flash size, truncating\n",
part->mtd_id);
part->parts[i].size = master->size - offset;
- part->num_parts = i;
}
offset += part->parts[i].size;
}