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Commit eaf487ca authored by Omar Sandoval's avatar Omar Sandoval Committed by Jens Axboe
Browse files

parport/pd: stop sharing request queue across multiple gendisks 



Compile-tested only.

Cc: Tim Waugh <tim@cyberelk.net>
Signed-off-by: default avatarOmar Sandoval <osandov@fb.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent a893cd76

drivers/block/paride/pd.c

+34 −16
Original line number Diff line number Diff line
@@ -381,12 +381,33 @@ static enum action do_pd_write_start(void); 
static enum action do_pd_read_drq(void);

static enum action do_pd_write_done(void);



static struct request_queue *pd_queue;

static int pd_queue;

static int pd_claimed;



static struct pd_unit *pd_current; /* current request's drive */

static PIA *pi_current; /* current request's PIA */



static int set_next_request(void)

{

	struct gendisk *disk;

	struct request_queue *q;

	int old_pos = pd_queue;



	do {

		disk = pd[pd_queue].gd;

		q = disk ? disk->queue : NULL;

		if (++pd_queue == PD_UNITS)

			pd_queue = 0;

		if (q) {

			pd_req = blk_fetch_request(q);

			if (pd_req)

				break;

		}

	} while (pd_queue != old_pos);



	return pd_req != NULL;

}



static void run_fsm(void)

{

	while (1) {
@@ -418,8 +439,7 @@ static void run_fsm(void) 
				spin_lock_irqsave(&pd_lock, saved_flags);

				if (!__blk_end_request_cur(pd_req,

						res == Ok ? 0 : -EIO)) {

					pd_req = blk_fetch_request(pd_queue);

					if (!pd_req)

					if (!set_next_request())

						stop = 1;

				}

				spin_unlock_irqrestore(&pd_lock, saved_flags);
@@ -839,7 +859,13 @@ static void pd_probe_drive(struct pd_unit *disk) 
	p->first_minor = (disk - pd) << PD_BITS;

	disk->gd = p;

	p->private_data = disk;

	p->queue = pd_queue;

	p->queue = blk_init_queue(do_pd_request, &pd_lock);

	if (!p->queue) {

		disk->gd = NULL;

		put_disk(p);

		return;

	}

	blk_queue_max_hw_sectors(p->queue, cluster);



	if (disk->drive == -1) {

		for (disk->drive = 0; disk->drive <= 1; disk->drive++)
@@ -919,26 +945,18 @@ static int __init pd_init(void) 
	if (disable)

		goto out1;



	pd_queue = blk_init_queue(do_pd_request, &pd_lock);

	if (!pd_queue)

		goto out1;



	blk_queue_max_hw_sectors(pd_queue, cluster);



	if (register_blkdev(major, name))

		goto out2;

		goto out1;



	printk("%s: %s version %s, major %d, cluster %d, nice %d\n",

	       name, name, PD_VERSION, major, cluster, nice);

	if (!pd_detect())

		goto out3;

		goto out2;



	return 0;



out3:

	unregister_blkdev(major, name);

out2:

	blk_cleanup_queue(pd_queue);

	unregister_blkdev(major, name);

out1:

	return -ENODEV;

}
@@ -953,11 +971,11 @@ static void __exit pd_exit(void) 
		if (p) {

			disk->gd = NULL;

			del_gendisk(p);

			blk_cleanup_queue(p->queue);

			put_disk(p);

			pi_release(disk->pi);

		}

	}

	blk_cleanup_queue(pd_queue);

}



MODULE_LICENSE("GPL");