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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: David Woodhouse <dwmw2@infradead.org>
Signed-off-by: Pierre Ossman <drzeus@drzeus.cx>
hifive-unleashed-5.1
David Woodhouse 2007-11-21 18:45:12 +01:00 committed by Pierre Ossman
parent b37a05069b
commit 1dff314451
1 changed files with 6 additions and 8 deletions
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14
drivers/mmc/card/block.c
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@ -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);