Commit 1dff3144 authored by David Woodhouse's avatar David Woodhouse Committed by Pierre Ossman
Browse files

mmc: Avoid re-using minor numbers before the original device is closed. 



Move the code which marks the minor number as free to mmc_blk_put() so
that it happens on the final close() (or removal), instead of doing it
at removal even when the device is still logically open.

Signed-off-by: default avatarDavid Woodhouse <dwmw2@infradead.org>
Signed-off-by: default avatarPierre Ossman <drzeus@drzeus.cx>
parent b37a0506

drivers/mmc/card/block.c

+6 −8
Original line number Diff line number Diff line
@@ -44,6 +44,9 @@ 
 * max 8 partitions per card

 */

#define MMC_SHIFT	3

#define MMC_NUM_MINORS	(256 >> MMC_SHIFT)



static unsigned long dev_use[MMC_NUM_MINORS/(8*sizeof(unsigned long))];



/*

 * There is one mmc_blk_data per slot.
@@ -80,6 +83,9 @@ static void mmc_blk_put(struct mmc_blk_data *md) 
	mutex_lock(&open_lock);

	md->usage--;

	if (md->usage == 0) {

		int devidx = md->disk->first_minor >> MMC_SHIFT;

		__clear_bit(devidx, dev_use);



		put_disk(md->disk);

		kfree(md);

	}
@@ -406,9 +412,6 @@ static int mmc_blk_issue_rq(struct mmc_queue *mq, struct request *req) 
	return 0;

}



#define MMC_NUM_MINORS	(256 >> MMC_SHIFT)



static unsigned long dev_use[MMC_NUM_MINORS/(8*sizeof(unsigned long))];



static inline int mmc_blk_readonly(struct mmc_card *card)

{
@@ -574,17 +577,12 @@ static void mmc_blk_remove(struct mmc_card *card) 
	struct mmc_blk_data *md = mmc_get_drvdata(card);



	if (md) {

		int devidx;



		/* Stop new requests from getting into the queue */

		del_gendisk(md->disk);



		/* Then flush out any already in there */

		mmc_cleanup_queue(&md->queue);



		devidx = md->disk->first_minor >> MMC_SHIFT;

		__clear_bit(devidx, dev_use);



		mmc_blk_put(md);

	}

	mmc_set_drvdata(card, NULL);

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