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Commit b10fa99e authored by Ulf Hansson's avatar Ulf Hansson
Browse files

mmc: block: Convert to IDA for partition device indexes 



Instead of using an mmc specific implementation to deal with indexes
through a BITMAP, let's convert to use the IDA library.

Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
parent 06b5cca5

drivers/mmc/card/block.c

+27 −9
Original line number Diff line number Diff line
@@ -35,6 +35,7 @@ 
#include <linux/capability.h>

#include <linux/compat.h>

#include <linux/pm_runtime.h>

#include <linux/idr.h>



#include <linux/mmc/ioctl.h>

#include <linux/mmc/card.h>
@@ -78,14 +79,14 @@ static int perdev_minors = CONFIG_MMC_BLOCK_MINORS; 
/*

 * We've only got one major, so number of mmcblk devices is

 * limited to (1 << 20) / number of minors per device.  It is also

 * currently limited by the size of the static bitmaps below.

 * limited by the MAX_DEVICES below.

 */

static int max_devices;



#define MAX_DEVICES 256



/* TODO: Replace these with struct ida */

static DECLARE_BITMAP(dev_use, MAX_DEVICES);

static DEFINE_IDA(mmc_blk_ida);

static DEFINE_SPINLOCK(mmc_blk_lock);



/*

 * There is one mmc_blk_data per slot.
@@ -178,7 +179,9 @@ static void mmc_blk_put(struct mmc_blk_data *md) 
		int devidx = mmc_get_devidx(md->disk);

		blk_cleanup_queue(md->queue.queue);



		__clear_bit(devidx, dev_use);

		spin_lock(&mmc_blk_lock);

		ida_remove(&mmc_blk_ida, devidx);

		spin_unlock(&mmc_blk_lock);



		put_disk(md->disk);

		kfree(md);
@@ -2189,10 +2192,23 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card, 
	struct mmc_blk_data *md;

	int devidx, ret;



	devidx = find_first_zero_bit(dev_use, max_devices);

	if (devidx >= max_devices)

		return ERR_PTR(-ENOSPC);

	__set_bit(devidx, dev_use);

again:

	if (!ida_pre_get(&mmc_blk_ida, GFP_KERNEL))

		return ERR_PTR(-ENOMEM);



	spin_lock(&mmc_blk_lock);

	ret = ida_get_new(&mmc_blk_ida, &devidx);

	spin_unlock(&mmc_blk_lock);



	if (ret == -EAGAIN)

		goto again;

	else if (ret)

		return ERR_PTR(ret);



	if (devidx >= max_devices) {

		ret = -ENOSPC;

		goto out;

	}



	md = kzalloc(sizeof(struct mmc_blk_data), GFP_KERNEL);

	if (!md) {
@@ -2289,7 +2305,9 @@ static struct mmc_blk_data *mmc_blk_alloc_req(struct mmc_card *card, 
 err_kfree:

	kfree(md);

 out:

	__clear_bit(devidx, dev_use);

	spin_lock(&mmc_blk_lock);

	ida_remove(&mmc_blk_ida, devidx);

	spin_unlock(&mmc_blk_lock);

	return ERR_PTR(ret);

}