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memstick: fix hangs on unexpected device removal in mspro_blk 

mspro_block_remove() is called from detect thread that first calls the
mspro_block_stop(), which stops the request queue.  If we call
del_gendisk() with the queue stopped we get a deadlock.

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Cc: Alex Dubov <oakad@yahoo.com>
Cc: <stable@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Maxim Levitsky 2010-08-11 14:17:52 -07:00 committed by Linus Torvalds
parent 21fd0495ea
commit d862b13bc8
1 changed files with 3 additions and 2 deletions
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5
drivers/memstick/core/mspro_block.c
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@ -1339,13 +1339,14 @@ static void mspro_block_remove(struct memstick_dev *card)
struct mspro_block_data *msb = memstick_get_drvdata(card);
unsigned long flags;
del_gendisk(msb->disk);
dev_dbg(&card->dev, "mspro block remove\n");
spin_lock_irqsave(&msb->q_lock, flags);
msb->eject = 1;
blk_start_queue(msb->queue);
spin_unlock_irqrestore(&msb->q_lock, flags);
del_gendisk(msb->disk);
dev_dbg(&card->dev, "mspro block remove\n");
blk_cleanup_queue(msb->queue);
msb->queue = NULL;