forked from Minki/linux
mtd: handle partitioning on devices with 0 erasesize
erasesize is meaningful for flash devices but for SRAM there is no concept of an erase block so erasesize is set to 0. When partitioning these devices instead of ensuring partitions fall on erasesize boundaries we ensure they fall on writesize boundaries. Helped-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz> Acked-by: Boris Brezillon <boris.brezillon@free-electrons.com> Signed-off-by: Brian Norris <computersforpeace@gmail.com>
This commit is contained in:
parent
c46adf0976
commit
1eeef2d748
@ -393,8 +393,12 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
|
||||
const struct mtd_partition *part, int partno,
|
||||
uint64_t cur_offset)
|
||||
{
|
||||
int wr_alignment = (master->flags & MTD_NO_ERASE) ? master->writesize:
|
||||
master->erasesize;
|
||||
struct mtd_part *slave;
|
||||
u32 remainder;
|
||||
char *name;
|
||||
u64 tmp;
|
||||
|
||||
/* allocate the partition structure */
|
||||
slave = kzalloc(sizeof(*slave), GFP_KERNEL);
|
||||
@ -499,10 +503,11 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
|
||||
if (slave->offset == MTDPART_OFS_APPEND)
|
||||
slave->offset = cur_offset;
|
||||
if (slave->offset == MTDPART_OFS_NXTBLK) {
|
||||
tmp = cur_offset;
|
||||
slave->offset = cur_offset;
|
||||
if (mtd_mod_by_eb(cur_offset, master) != 0) {
|
||||
/* Round up to next erasesize */
|
||||
slave->offset = (mtd_div_by_eb(cur_offset, master) + 1) * master->erasesize;
|
||||
remainder = do_div(tmp, wr_alignment);
|
||||
if (remainder) {
|
||||
slave->offset += wr_alignment - remainder;
|
||||
printk(KERN_NOTICE "Moving partition %d: "
|
||||
"0x%012llx -> 0x%012llx\n", partno,
|
||||
(unsigned long long)cur_offset, (unsigned long long)slave->offset);
|
||||
@ -567,19 +572,22 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
|
||||
slave->mtd.erasesize = master->erasesize;
|
||||
}
|
||||
|
||||
if ((slave->mtd.flags & MTD_WRITEABLE) &&
|
||||
mtd_mod_by_eb(slave->offset, &slave->mtd)) {
|
||||
tmp = slave->offset;
|
||||
remainder = do_div(tmp, wr_alignment);
|
||||
if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
|
||||
/* Doesn't start on a boundary of major erase size */
|
||||
/* FIXME: Let it be writable if it is on a boundary of
|
||||
* _minor_ erase size though */
|
||||
slave->mtd.flags &= ~MTD_WRITEABLE;
|
||||
printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
|
||||
printk(KERN_WARNING"mtd: partition \"%s\" doesn't start on an erase/write block boundary -- force read-only\n",
|
||||
part->name);
|
||||
}
|
||||
if ((slave->mtd.flags & MTD_WRITEABLE) &&
|
||||
mtd_mod_by_eb(slave->mtd.size, &slave->mtd)) {
|
||||
|
||||
tmp = slave->mtd.size;
|
||||
remainder = do_div(tmp, wr_alignment);
|
||||
if ((slave->mtd.flags & MTD_WRITEABLE) && remainder) {
|
||||
slave->mtd.flags &= ~MTD_WRITEABLE;
|
||||
printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
|
||||
printk(KERN_WARNING"mtd: partition \"%s\" doesn't end on an erase/write block -- force read-only\n",
|
||||
part->name);
|
||||
}
|
||||
|
||||
|
Loading…
Reference in New Issue
Block a user