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mmc: Ensure hardware partitions don't mess with mmcblk device naming.

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With the hardware partitions support (which represent additional logical
devices present on MMC), devidx does not correspond with index used to form
/dev/mmcblkX names. So use an additional allocated index for device names.

Signed-off-by: Andrei Warkentin <andreiw@motorola.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
This commit is contained in:
Andrei Warkentin 2011-04-21 22:46:13 -05:00 committed by Chris Ball
parent 393c1a34dd
commit f06c9153f5
1 changed files with 19 additions and 7 deletions
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26
drivers/mmc/card/block.c
View file

@ -75,6 +75,7 @@ static int max_devices;
/* 256 minors, so at most 256 separate devices */
static DECLARE_BITMAP(dev_use, 256);
static DECLARE_BITMAP(name_use, 256);
/*
* There is one mmc_blk_data per slot.
@ -88,6 +89,7 @@ struct mmc_blk_data {
unsigned int usage;
unsigned int read_only;
unsigned int part_type;
unsigned int name_idx;
/*
* Only set in main mmc_blk_data associated
@ -766,6 +768,20 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
goto out;
}
/*
* !subname implies we are creating main mmc_blk_data that will be
* associated with mmc_card with mmc_set_drvdata. Due to device
* partitions, devidx will not coincide with a per-physical card
* index anymore so we keep track of a name index.
*/
if (!subname) {
md->name_idx = find_first_zero_bit(name_use, max_devices);
__set_bit(md->name_idx, name_use);
}
else
md->name_idx = ((struct mmc_blk_data *)
dev_to_disk(parent)->private_data)->name_idx;
/*
* Set the read-only status based on the supported commands
* and the write protect switch.
@ -811,13 +827,8 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card,
* messages to tell when the card is present.
*/
if (subname)
snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
"mmcblk%d%s",
mmc_get_devidx(dev_to_disk(parent)), subname);
else
snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
"mmcblk%d", devidx);
snprintf(md->disk->disk_name, sizeof(md->disk->disk_name),
"mmcblk%d%s", md->name_idx, subname ? subname : "");
blk_queue_logical_block_size(md->queue.queue, 512);
set_capacity(md->disk, size);
@ -944,6 +955,7 @@ static void mmc_blk_remove_parts(struct mmc_card *card,
struct list_head *pos, *q;
struct mmc_blk_data *part_md;
__clear_bit(md->name_idx, name_use);
list_for_each_safe(pos, q, &md->part) {
part_md = list_entry(pos, struct mmc_blk_data, part);
list_del(pos);