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[MTD][MTDPART] Seperate main loop from per-partition code in add_mtd_partition 

add_mtd_partition was a 150+ line monster consisting mostly of a single
loop.  Seperate the loop from most of the body.  Now it should be
obvious which variables are carried around from iteration to iteration.

Signed-off-by: Jörn Engel <joern@logfs.org>
Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: David Woodhouse <David.Woodhouse@intel.com>
This commit is contained in:
Atsushi Nemoto 2008-07-19 01:00:18 +09:00 committed by David Woodhouse
parent 4b5e33a7bf
commit 7788ba71a6
1 changed files with 166 additions and 158 deletions
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84
drivers/mtd/mtdpart.c
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@ -313,45 +313,32 @@ int del_mtd_partitions(struct mtd_info *master)
return 0;
}
/*
* This function, given a master MTD object and a partition table, creates
* and registers slave MTD objects which are bound to the master according to
* the partition definitions.
* (Q: should we register the master MTD object as well?)
*/
int add_mtd_partitions(struct mtd_info *master,
const struct mtd_partition *parts,
int nbparts)
static struct mtd_part *add_one_partition(struct mtd_info *master,
const struct mtd_partition *part, int partno,
u_int32_t cur_offset)
{
struct mtd_part *slave;
u_int32_t cur_offset = 0;
int i;
printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
for (i = 0; i < nbparts; i++) {
/* allocate the partition structure */
slave = kzalloc (sizeof(*slave), GFP_KERNEL);
if (!slave) {
printk ("memory allocation error while creating partitions for \"%s\"\n",
printk("memory allocation error while creating partitions for \"%s\"\n",
master->name);
del_mtd_partitions(master);
return -ENOMEM;
return NULL;
}
list_add(&slave->list, &mtd_partitions);
/* set up the MTD object for this partition */
slave->mtd.type = master->type;
slave->mtd.flags = master->flags & ~parts[i].mask_flags;
slave->mtd.size = parts[i].size;
slave->mtd.flags = master->flags & ~part->mask_flags;
slave->mtd.size = part->size;
slave->mtd.writesize = master->writesize;
slave->mtd.oobsize = master->oobsize;
slave->mtd.oobavail = master->oobavail;
slave->mtd.subpage_sft = master->subpage_sft;
slave->mtd.name = parts[i].name;
slave->mtd.name = part->name;
slave->mtd.owner = master->owner;
slave->mtd.read = part_read;
@ -383,7 +370,7 @@ int add_mtd_partitions(struct mtd_info *master,
slave->mtd.get_fact_prot_info = part_get_fact_prot_info;
if (master->sync)
slave->mtd.sync = part_sync;
if (!i && master->suspend && master->resume) {
if (!partno && master->suspend && master->resume) {
slave->mtd.suspend = part_suspend;
slave->mtd.resume = part_resume;
}
@ -399,8 +386,8 @@ int add_mtd_partitions(struct mtd_info *master,
slave->mtd.block_markbad = part_block_markbad;
slave->mtd.erase = part_erase;
slave->master = master;
slave->offset = parts[i].offset;
slave->index = i;
slave->offset = part->offset;
slave->index = partno;
if (slave->offset == MTDPART_OFS_APPEND)
slave->offset = cur_offset;
@ -410,13 +397,12 @@ int add_mtd_partitions(struct mtd_info *master,
/* Round up to next erasesize */
slave->offset = ((cur_offset / master->erasesize) + 1) * master->erasesize;
printk(KERN_NOTICE "Moving partition %d: "
"0x%08x -> 0x%08x\n", i,
"0x%08x -> 0x%08x\n", partno,
cur_offset, slave->offset);
}
}
if (slave->mtd.size == MTDPART_SIZ_FULL)
slave->mtd.size = master->size - slave->offset;
cur_offset = slave->offset + slave->mtd.size;
printk (KERN_NOTICE "0x%08x-0x%08x : \"%s\"\n", slave->offset,
slave->offset + slave->mtd.size, slave->mtd.name);
@ -427,12 +413,12 @@ int add_mtd_partitions(struct mtd_info *master,
slave->offset = 0;
slave->mtd.size = 0;
printk ("mtd: partition \"%s\" is out of reach -- disabled\n",
parts[i].name);
part->name);
}
if (slave->offset + slave->mtd.size > master->size) {
slave->mtd.size = master->size - slave->offset;
printk ("mtd: partition \"%s\" extends beyond the end of device \"%s\" -- size truncated to %#x\n",
parts[i].name, master->name, slave->mtd.size);
part->name, master->name, slave->mtd.size);
}
if (master->numeraseregions>1) {
/* Deal with variable erase size stuff */
@ -440,10 +426,10 @@ int add_mtd_partitions(struct mtd_info *master,
struct mtd_erase_region_info *regions = master->eraseregions;
/* Find the first erase regions which is part of this partition. */
for (i=0; i < master->numeraseregions && slave->offset >= regions[i].offset; i++)
for (i=0; i < master->numeraseregions && regions[i].offset <= slave->offset; i++)
;
for (i--; i < master->numeraseregions && slave->offset + slave->mtd.size > regions[i].offset; i++) {
for (i--; i < master->numeraseregions && regions[i].offset < slave->offset + slave->mtd.size; i++) {
if (slave->mtd.erasesize < regions[i].erasesize) {
slave->mtd.erasesize = regions[i].erasesize;
}
@ -459,13 +445,13 @@ int add_mtd_partitions(struct mtd_info *master,
/* FIXME: Let it be writable if it is on a boundary of _minor_ erase size though */
slave->mtd.flags &= ~MTD_WRITEABLE;
printk ("mtd: partition \"%s\" doesn't start on an erase block boundary -- force read-only\n",
parts[i].name);
part->name);
}
if ((slave->mtd.flags & MTD_WRITEABLE) &&
(slave->mtd.size % slave->mtd.erasesize)) {
slave->mtd.flags &= ~MTD_WRITEABLE;
printk ("mtd: partition \"%s\" doesn't end on an erase block -- force read-only\n",
parts[i].name);
part->name);
}
slave->mtd.ecclayout = master->ecclayout;
@ -480,17 +466,39 @@ int add_mtd_partitions(struct mtd_info *master,
}
}
if(parts[i].mtdp)
{ /* store the object pointer (caller may or may not register it */
*parts[i].mtdp = &slave->mtd;
if(part->mtdp) { /* store the object pointer (caller may or may not register it */
*part->mtdp = &slave->mtd;
slave->registered = 0;
}
else
{
} else {
/* register our partition */
add_mtd_device(&slave->mtd);
slave->registered = 1;
}
return slave;
}
/*
* This function, given a master MTD object and a partition table, creates
* and registers slave MTD objects which are bound to the master according to
* the partition definitions.
* (Q: should we register the master MTD object as well?)
*/
int add_mtd_partitions(struct mtd_info *master,
const struct mtd_partition *parts,
int nbparts)
{
struct mtd_part *slave;
u_int32_t cur_offset = 0;
int i;
printk (KERN_NOTICE "Creating %d MTD partitions on \"%s\":\n", nbparts, master->name);
for (i = 0; i < nbparts; i++) {
slave = add_one_partition(master, parts + i, i, cur_offset);
if (!slave)
return -ENOMEM;
cur_offset = slave->offset + slave->mtd.size;
}
return 0;