Commit b3025457 authored by Benjamin Herrenschmidt's avatar Benjamin Herrenschmidt Committed by Jens Axboe
Browse files

block/swim3: Locking fixes 



The old PowerMac swim3 driver has some "interesting" locking issues,
using a private lock and failing to lock the queue before completing
requests, which triggered WARN_ONs among others.

This rips out the private lock, makes everything operate under the
block queue lock, and generally makes things simpler.

We used to also share a queue between the two possible instances which
was problematic since we might pick the wrong controller in some cases,
so make the queue and the current request per-instance and use
queuedata to point to our private data which is a lot cleaner.

We still share the queue lock but then, it's nearly impossible to actually
use 2 swim3's simultaneously: one would need to have a Wallstreet
PowerBook, the only machine afaik with two of these on the motherboard,
and populate both hotswap bays with a floppy drive (the machine ships
only with one), so nobody cares...

While at it, add a little fix to clear up stale interrupts when loading
the driver or plugging a floppy drive in a bay.

Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent dfaf3c03

drivers/block/swim3.c

+215 −147
Original line number Diff line number Diff line
@@ -16,6 +16,8 @@ 
 * handle GCR disks

 */



#undef DEBUG



#include <linux/stddef.h>

#include <linux/kernel.h>

#include <linux/sched.h>
@@ -36,13 +38,11 @@ 
#include <asm/machdep.h>

#include <asm/pmac_feature.h>



static DEFINE_MUTEX(swim3_mutex);

static struct request_queue *swim3_queue;

static struct gendisk *disks[2];

static struct request *fd_req;



#define MAX_FLOPPIES	2



static DEFINE_MUTEX(swim3_mutex);

static struct gendisk *disks[MAX_FLOPPIES];



enum swim_state {

	idle,

	locating,
@@ -177,7 +177,6 @@ struct swim3 { 


struct floppy_state {

	enum swim_state	state;

	spinlock_t lock;

	struct swim3 __iomem *swim3;	/* hardware registers */

	struct dbdma_regs __iomem *dma;	/* DMA controller registers */

	int	swim3_intr;	/* interrupt number for SWIM3 */
@@ -204,8 +203,20 @@ struct floppy_state { 
	int	wanted;

	struct macio_dev *mdev;

	char	dbdma_cmd_space[5 * sizeof(struct dbdma_cmd)];

	int	index;

	struct request *cur_req;

};



#define swim3_err(fmt, arg...)	dev_err(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)

#define swim3_warn(fmt, arg...)	dev_warn(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)

#define swim3_info(fmt, arg...)	dev_info(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)



#ifdef DEBUG

#define swim3_dbg(fmt, arg...)	dev_dbg(&fs->mdev->ofdev.dev, "[fd%d] " fmt, fs->index, arg)

#else

#define swim3_dbg(fmt, arg...)	do { } while(0)

#endif



static struct floppy_state floppy_states[MAX_FLOPPIES];

static int floppy_count = 0;

static DEFINE_SPINLOCK(swim3_lock);
@@ -224,17 +235,8 @@ static unsigned short write_postamble[] = { 
	0, 0, 0, 0, 0, 0

};



static void swim3_select(struct floppy_state *fs, int sel);

static void swim3_action(struct floppy_state *fs, int action);

static int swim3_readbit(struct floppy_state *fs, int bit);

static void do_fd_request(struct request_queue * q);

static void start_request(struct floppy_state *fs);

static void set_timeout(struct floppy_state *fs, int nticks,

			void (*proc)(unsigned long));

static void scan_track(struct floppy_state *fs);

static void seek_track(struct floppy_state *fs, int n);

static void init_dma(struct dbdma_cmd *cp, int cmd, void *buf, int count);

static void setup_transfer(struct floppy_state *fs);

static void act(struct floppy_state *fs);

static void scan_timeout(unsigned long data);

static void seek_timeout(unsigned long data);
@@ -254,18 +256,21 @@ static unsigned int floppy_check_events(struct gendisk *disk, 
					unsigned int clearing);

static int floppy_revalidate(struct gendisk *disk);



static bool swim3_end_request(int err, unsigned int nr_bytes)

static bool swim3_end_request(struct floppy_state *fs, int err, unsigned int nr_bytes)

{

	if (__blk_end_request(fd_req, err, nr_bytes))

		return true;

	struct request *req = fs->cur_req;

	int rc;



	fd_req = NULL;

	return false;

}

	swim3_dbg("  end request, err=%d nr_bytes=%d, cur_req=%p\n",

		  err, nr_bytes, req);



static bool swim3_end_request_cur(int err)

{

	return swim3_end_request(err, blk_rq_cur_bytes(fd_req));

	if (err)

		nr_bytes = blk_rq_cur_bytes(req);

	rc = __blk_end_request(req, err, nr_bytes);

	if (rc)

		return true;

	fs->cur_req = NULL;

	return false;

}



static void swim3_select(struct floppy_state *fs, int sel)
@@ -303,50 +308,53 @@ static int swim3_readbit(struct floppy_state *fs, int bit) 
	return (stat & DATA) == 0;

}



static void do_fd_request(struct request_queue * q)

{

	int i;



	for(i=0; i<floppy_count; i++) {

		struct floppy_state *fs = &floppy_states[i];

		if (fs->mdev->media_bay &&

		    check_media_bay(fs->mdev->media_bay) != MB_FD)

			continue;

		start_request(fs);

	}

}



static void start_request(struct floppy_state *fs)

{

	struct request *req;

	unsigned long x;



	swim3_dbg("start request, initial state=%d\n", fs->state);



	if (fs->state == idle && fs->wanted) {

		fs->state = available;

		wake_up(&fs->wait);

		return;

	}

	while (fs->state == idle) {

		if (!fd_req) {

			fd_req = blk_fetch_request(swim3_queue);

			if (!fd_req)

		swim3_dbg("start request, idle loop, cur_req=%p\n", fs->cur_req);

		if (!fs->cur_req) {

			fs->cur_req = blk_fetch_request(disks[fs->index]->queue);

			swim3_dbg("  fetched request %p\n", fs->cur_req);

			if (!fs->cur_req)

				break;

		}

		req = fd_req;

#if 0

		printk("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",

		req = fs->cur_req;



		if (fs->mdev->media_bay &&

		    check_media_bay(fs->mdev->media_bay) != MB_FD) {

			swim3_dbg("%s", "  media bay absent, dropping req\n");

			swim3_end_request(fs, -ENODEV, 0);

			continue;

		}



#if 0 /* This is really too verbose */

		swim3_dbg("do_fd_req: dev=%s cmd=%d sec=%ld nr_sec=%u buf=%p\n",

			  req->rq_disk->disk_name, req->cmd,

		       (long)blk_rq_pos(req), blk_rq_sectors(req), req->buffer);

		printk("           errors=%d current_nr_sectors=%u\n",

			  (long)blk_rq_pos(req), blk_rq_sectors(req),

			  req->buffer);

		swim3_dbg("           errors=%d current_nr_sectors=%u\n",

			  req->errors, blk_rq_cur_sectors(req));

#endif



		if (blk_rq_pos(req) >= fs->total_secs) {

			swim3_end_request_cur(-EIO);

			swim3_dbg("  pos out of bounds (%ld, max is %ld)\n",

				  (long)blk_rq_pos(req), (long)fs->total_secs);

			swim3_end_request(fs, -EIO, 0);

			continue;

		}

		if (fs->ejected) {

			swim3_end_request_cur(-EIO);

			swim3_dbg("%s", "  disk ejected\n");

			swim3_end_request(fs, -EIO, 0);

			continue;

		}
@@ -354,7 +362,8 @@ static void start_request(struct floppy_state *fs) 
			if (fs->write_prot < 0)

				fs->write_prot = swim3_readbit(fs, WRITE_PROT);

			if (fs->write_prot) {

				swim3_end_request_cur(-EIO);

				swim3_dbg("%s", "  try to write, disk write protected\n");

				swim3_end_request(fs, -EIO, 0);

				continue;

			}

		}
@@ -369,7 +378,6 @@ static void start_request(struct floppy_state *fs) 
		x = ((long)blk_rq_pos(req)) % fs->secpercyl;

		fs->head = x / fs->secpertrack;

		fs->req_sector = x % fs->secpertrack + 1;

		fd_req = req;

		fs->state = do_transfer;

		fs->retries = 0;
@@ -377,12 +385,14 @@ static void start_request(struct floppy_state *fs) 
	}

}



static void do_fd_request(struct request_queue * q)

{

	start_request(q->queuedata);

}



static void set_timeout(struct floppy_state *fs, int nticks,

			void (*proc)(unsigned long))

{

	unsigned long flags;



	spin_lock_irqsave(&fs->lock, flags);

	if (fs->timeout_pending)

		del_timer(&fs->timeout);

	fs->timeout.expires = jiffies + nticks;
@@ -390,7 +400,6 @@ static void set_timeout(struct floppy_state *fs, int nticks, 
	fs->timeout.data = (unsigned long) fs;

	add_timer(&fs->timeout);

	fs->timeout_pending = 1;

	spin_unlock_irqrestore(&fs->lock, flags);

}



static inline void scan_track(struct floppy_state *fs)
@@ -442,40 +451,45 @@ static inline void setup_transfer(struct floppy_state *fs) 
	struct swim3 __iomem *sw = fs->swim3;

	struct dbdma_cmd *cp = fs->dma_cmd;

	struct dbdma_regs __iomem *dr = fs->dma;

	struct request *req = fs->cur_req;



	if (blk_rq_cur_sectors(fd_req) <= 0) {

		printk(KERN_ERR "swim3: transfer 0 sectors?\n");

	if (blk_rq_cur_sectors(req) <= 0) {

		swim3_warn("%s", "Transfer 0 sectors ?\n");

		return;

	}

	if (rq_data_dir(fd_req) == WRITE)

	if (rq_data_dir(req) == WRITE)

		n = 1;

	else {

		n = fs->secpertrack - fs->req_sector + 1;

		if (n > blk_rq_cur_sectors(fd_req))

			n = blk_rq_cur_sectors(fd_req);

		if (n > blk_rq_cur_sectors(req))

			n = blk_rq_cur_sectors(req);

	}



	swim3_dbg("  setup xfer at sect %d (of %d) head %d for %d\n",

		  fs->req_sector, fs->secpertrack, fs->head, n);



	fs->scount = n;

	swim3_select(fs, fs->head? READ_DATA_1: READ_DATA_0);

	out_8(&sw->sector, fs->req_sector);

	out_8(&sw->nsect, n);

	out_8(&sw->gap3, 0);

	out_le32(&dr->cmdptr, virt_to_bus(cp));

	if (rq_data_dir(fd_req) == WRITE) {

	if (rq_data_dir(req) == WRITE) {

		/* Set up 3 dma commands: write preamble, data, postamble */

		init_dma(cp, OUTPUT_MORE, write_preamble, sizeof(write_preamble));

		++cp;

		init_dma(cp, OUTPUT_MORE, fd_req->buffer, 512);

		init_dma(cp, OUTPUT_MORE, req->buffer, 512);

		++cp;

		init_dma(cp, OUTPUT_LAST, write_postamble, sizeof(write_postamble));

	} else {

		init_dma(cp, INPUT_LAST, fd_req->buffer, n * 512);

		init_dma(cp, INPUT_LAST, req->buffer, n * 512);

	}

	++cp;

	out_le16(&cp->command, DBDMA_STOP);

	out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);

	in_8(&sw->error);

	out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);

	if (rq_data_dir(fd_req) == WRITE)

	if (rq_data_dir(req) == WRITE)

		out_8(&sw->control_bis, WRITE_SECTORS);

	in_8(&sw->intr);

	out_le32(&dr->control, (RUN << 16) | RUN);
@@ -488,12 +502,16 @@ static inline void setup_transfer(struct floppy_state *fs) 
static void act(struct floppy_state *fs)

{

	for (;;) {

		swim3_dbg("  act loop, state=%d, req_cyl=%d, cur_cyl=%d\n",

			  fs->state, fs->req_cyl, fs->cur_cyl);



		switch (fs->state) {

		case idle:

			return;		/* XXX shouldn't get here */



		case locating:

			if (swim3_readbit(fs, TRACK_ZERO)) {

				swim3_dbg("%s", "    locate track 0\n");

				fs->cur_cyl = 0;

				if (fs->req_cyl == 0)

					fs->state = do_transfer;
@@ -511,7 +529,7 @@ static void act(struct floppy_state *fs) 
				break;

			}

			if (fs->req_cyl == fs->cur_cyl) {

				printk("whoops, seeking 0\n");

				swim3_warn("%s", "Whoops, seeking 0\n");

				fs->state = do_transfer;

				break;

			}
@@ -527,7 +545,9 @@ static void act(struct floppy_state *fs) 
		case do_transfer:

			if (fs->cur_cyl != fs->req_cyl) {

				if (fs->retries > 5) {

					swim3_end_request_cur(-EIO);

					swim3_err("Wrong cylinder in transfer, want: %d got %d\n",

						  fs->req_cyl, fs->cur_cyl);

					swim3_end_request(fs, -EIO, 0);

					fs->state = idle;

					return;

				}
@@ -542,7 +562,7 @@ static void act(struct floppy_state *fs) 
			return;



		default:

			printk(KERN_ERR"swim3: unknown state %d\n", fs->state);

			swim3_err("Unknown state %d\n", fs->state);

			return;

		}

	}
@@ -552,59 +572,75 @@ static void scan_timeout(unsigned long data) 
{

	struct floppy_state *fs = (struct floppy_state *) data;

	struct swim3 __iomem *sw = fs->swim3;

	unsigned long flags;



	swim3_dbg("* scan timeout, state=%d\n", fs->state);



	spin_lock_irqsave(&swim3_lock, flags);

	fs->timeout_pending = 0;

	out_8(&sw->control_bic, DO_ACTION | WRITE_SECTORS);

	out_8(&sw->select, RELAX);

	out_8(&sw->intr_enable, 0);

	fs->cur_cyl = -1;

	if (fs->retries > 5) {

		swim3_end_request_cur(-EIO);

		swim3_end_request(fs, -EIO, 0);

		fs->state = idle;

		start_request(fs);

	} else {

		fs->state = jogging;

		act(fs);

	}

	spin_unlock_irqrestore(&swim3_lock, flags);

}



static void seek_timeout(unsigned long data)

{

	struct floppy_state *fs = (struct floppy_state *) data;

	struct swim3 __iomem *sw = fs->swim3;

	unsigned long flags;



	swim3_dbg("* seek timeout, state=%d\n", fs->state);



	spin_lock_irqsave(&swim3_lock, flags);

	fs->timeout_pending = 0;

	out_8(&sw->control_bic, DO_SEEK);

	out_8(&sw->select, RELAX);

	out_8(&sw->intr_enable, 0);

	printk(KERN_ERR "swim3: seek timeout\n");

	swim3_end_request_cur(-EIO);

	swim3_err("%s", "Seek timeout\n");

	swim3_end_request(fs, -EIO, 0);

	fs->state = idle;

	start_request(fs);

	spin_unlock_irqrestore(&swim3_lock, flags);

}



static void settle_timeout(unsigned long data)

{

	struct floppy_state *fs = (struct floppy_state *) data;

	struct swim3 __iomem *sw = fs->swim3;

	unsigned long flags;



	swim3_dbg("* settle timeout, state=%d\n", fs->state);



	spin_lock_irqsave(&swim3_lock, flags);

	fs->timeout_pending = 0;

	if (swim3_readbit(fs, SEEK_COMPLETE)) {

		out_8(&sw->select, RELAX);

		fs->state = locating;

		act(fs);

		return;

		goto unlock;

	}

	out_8(&sw->select, RELAX);

	if (fs->settle_time < 2*HZ) {

		++fs->settle_time;

		set_timeout(fs, 1, settle_timeout);

		return;

		goto unlock;

	}

	printk(KERN_ERR "swim3: seek settle timeout\n");

	swim3_end_request_cur(-EIO);

	swim3_err("%s", "Seek settle timeout\n");

	swim3_end_request(fs, -EIO, 0);

	fs->state = idle;

	start_request(fs);

 unlock:

	spin_unlock_irqrestore(&swim3_lock, flags);

}



static void xfer_timeout(unsigned long data)
@@ -612,8 +648,12 @@ static void xfer_timeout(unsigned long data) 
	struct floppy_state *fs = (struct floppy_state *) data;

	struct swim3 __iomem *sw = fs->swim3;

	struct dbdma_regs __iomem *dr = fs->dma;

	unsigned long flags;

	int n;



	swim3_dbg("* xfer timeout, state=%d\n", fs->state);



	spin_lock_irqsave(&swim3_lock, flags);

	fs->timeout_pending = 0;

	out_le32(&dr->control, RUN << 16);

	/* We must wait a bit for dbdma to stop */
@@ -622,12 +662,13 @@ static void xfer_timeout(unsigned long data) 
	out_8(&sw->intr_enable, 0);

	out_8(&sw->control_bic, WRITE_SECTORS | DO_ACTION);

	out_8(&sw->select, RELAX);

	printk(KERN_ERR "swim3: timeout %sing sector %ld\n",

	       (rq_data_dir(fd_req)==WRITE? "writ": "read"),

	       (long)blk_rq_pos(fd_req));

	swim3_end_request_cur(-EIO);

	swim3_err("Timeout %sing sector %ld\n",

	       (rq_data_dir(fs->cur_req)==WRITE? "writ": "read"),

	       (long)blk_rq_pos(fs->cur_req));

	swim3_end_request(fs, -EIO, 0);

	fs->state = idle;

	start_request(fs);

	spin_unlock_irqrestore(&swim3_lock, flags);

}



static irqreturn_t swim3_interrupt(int irq, void *dev_id)
@@ -638,12 +679,17 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id) 
	int stat, resid;

	struct dbdma_regs __iomem *dr;

	struct dbdma_cmd *cp;

	unsigned long flags;

	struct request *req = fs->cur_req;



	swim3_dbg("* interrupt, state=%d\n", fs->state);



	spin_lock_irqsave(&swim3_lock, flags);

	intr = in_8(&sw->intr);

	err = (intr & ERROR_INTR)? in_8(&sw->error): 0;

	if ((intr & ERROR_INTR) && fs->state != do_transfer)

		printk(KERN_ERR "swim3_interrupt, state=%d, dir=%x, intr=%x, err=%x\n",

		       fs->state, rq_data_dir(fd_req), intr, err);

		swim3_err("Non-transfer error interrupt: state=%d, dir=%x, intr=%x, err=%x\n",

			  fs->state, rq_data_dir(req), intr, err);

	switch (fs->state) {

	case locating:

		if (intr & SEEN_SECTOR) {
@@ -653,10 +699,10 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id) 
			del_timer(&fs->timeout);

			fs->timeout_pending = 0;

			if (sw->ctrack == 0xff) {

				printk(KERN_ERR "swim3: seen sector but cyl=ff?\n");

				swim3_err("%s", "Seen sector but cyl=ff?\n");

				fs->cur_cyl = -1;

				if (fs->retries > 5) {

					swim3_end_request_cur(-EIO);

					swim3_end_request(fs, -EIO, 0);

					fs->state = idle;

					start_request(fs);

				} else {
@@ -668,7 +714,7 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id) 
			fs->cur_cyl = sw->ctrack;

			fs->cur_sector = sw->csect;

			if (fs->expect_cyl != -1 && fs->expect_cyl != fs->cur_cyl)

				printk(KERN_ERR "swim3: expected cyl %d, got %d\n",

				swim3_err("Expected cyl %d, got %d\n",

					  fs->expect_cyl, fs->cur_cyl);

			fs->state = do_transfer;

			act(fs);
@@ -704,7 +750,7 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id) 
		fs->timeout_pending = 0;

		dr = fs->dma;

		cp = fs->dma_cmd;

		if (rq_data_dir(fd_req) == WRITE)

		if (rq_data_dir(req) == WRITE)

			++cp;

		/*

		 * Check that the main data transfer has finished.
@@ -729,31 +775,32 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id) 
		if (intr & ERROR_INTR) {

			n = fs->scount - 1 - resid / 512;

			if (n > 0) {

				blk_update_request(fd_req, 0, n << 9);

				blk_update_request(req, 0, n << 9);

				fs->req_sector += n;

			}

			if (fs->retries < 5) {

				++fs->retries;

				act(fs);

			} else {

				printk("swim3: error %sing block %ld (err=%x)\n",

				       rq_data_dir(fd_req) == WRITE? "writ": "read",

				       (long)blk_rq_pos(fd_req), err);

				swim3_end_request_cur(-EIO);

				swim3_err("Error %sing block %ld (err=%x)\n",

				       rq_data_dir(req) == WRITE? "writ": "read",

				       (long)blk_rq_pos(req), err);

				swim3_end_request(fs, -EIO, 0);

				fs->state = idle;

			}

		} else {

			if ((stat & ACTIVE) == 0 || resid != 0) {

				/* musta been an error */

				printk(KERN_ERR "swim3: fd dma: stat=%x resid=%d\n", stat, resid);

				printk(KERN_ERR "  state=%d, dir=%x, intr=%x, err=%x\n",

				       fs->state, rq_data_dir(fd_req), intr, err);

				swim3_end_request_cur(-EIO);

				swim3_err("fd dma error: stat=%x resid=%d\n", stat, resid);

				swim3_err("  state=%d, dir=%x, intr=%x, err=%x\n",

					  fs->state, rq_data_dir(req), intr, err);

				swim3_end_request(fs, -EIO, 0);

				fs->state = idle;

				start_request(fs);

				break;

			}

			if (swim3_end_request(0, fs->scount << 9)) {

			fs->retries = 0;

			if (swim3_end_request(fs, 0, fs->scount << 9)) {

				fs->req_sector += fs->scount;

				if (fs->req_sector > fs->secpertrack) {

					fs->req_sector -= fs->secpertrack;
@@ -770,8 +817,9 @@ static irqreturn_t swim3_interrupt(int irq, void *dev_id) 
			start_request(fs);

		break;

	default:

		printk(KERN_ERR "swim3: don't know what to do in state %d\n", fs->state);

		swim3_err("Don't know what to do in state %d\n", fs->state);

	}

	spin_unlock_irqrestore(&swim3_lock, flags);

	return IRQ_HANDLED;

}
@@ -781,26 +829,31 @@ static void fd_dma_interrupt(int irq, void *dev_id) 
}

*/



/* Called under the mutex to grab exclusive access to a drive */

static int grab_drive(struct floppy_state *fs, enum swim_state state,

		      int interruptible)

{

	unsigned long flags;



	spin_lock_irqsave(&fs->lock, flags);

	if (fs->state != idle) {

	swim3_dbg("%s", "-> grab drive\n");



	spin_lock_irqsave(&swim3_lock, flags);

	if (fs->state != idle && fs->state != available) {

		++fs->wanted;

		while (fs->state != available) {

			spin_unlock_irqrestore(&swim3_lock, flags);

			if (interruptible && signal_pending(current)) {

				--fs->wanted;

				spin_unlock_irqrestore(&fs->lock, flags);

				return -EINTR;

			}

			interruptible_sleep_on(&fs->wait);

			spin_lock_irqsave(&swim3_lock, flags);

		}

		--fs->wanted;

	}

	fs->state = state;

	spin_unlock_irqrestore(&fs->lock, flags);

	spin_unlock_irqrestore(&swim3_lock, flags);



	return 0;

}
@@ -808,10 +861,12 @@ static void release_drive(struct floppy_state *fs) 
{

	unsigned long flags;



	spin_lock_irqsave(&fs->lock, flags);

	swim3_dbg("%s", "-> release drive\n");



	spin_lock_irqsave(&swim3_lock, flags);

	fs->state = idle;

	start_request(fs);

	spin_unlock_irqrestore(&fs->lock, flags);

	spin_unlock_irqrestore(&swim3_lock, flags);

}



static int fd_eject(struct floppy_state *fs)
@@ -966,6 +1021,7 @@ static int floppy_release(struct gendisk *disk, fmode_t mode) 
{

	struct floppy_state *fs = disk->private_data;

	struct swim3 __iomem *sw = fs->swim3;



	mutex_lock(&swim3_mutex);

	if (fs->ref_count > 0 && --fs->ref_count == 0) {

		swim3_action(fs, MOTOR_OFF);
@@ -1031,30 +1087,48 @@ static const struct block_device_operations floppy_fops = { 
	.revalidate_disk= floppy_revalidate,

};



static void swim3_mb_event(struct macio_dev* mdev, int mb_state)

{

	struct floppy_state *fs = macio_get_drvdata(mdev);

	struct swim3 __iomem *sw = fs->swim3;



	if (!fs)

		return;

	if (mb_state != MB_FD)

		return;



	/* Clear state */

	out_8(&sw->intr_enable, 0);

	in_8(&sw->intr);

	in_8(&sw->error);

}



static int swim3_add_device(struct macio_dev *mdev, int index)

{

	struct device_node *swim = mdev->ofdev.dev.of_node;

	struct floppy_state *fs = &floppy_states[index];

	int rc = -EBUSY;



	/* Do this first for message macros */

	memset(fs, 0, sizeof(*fs));

	fs->mdev = mdev;

	fs->index = index;



	/* Check & Request resources */

	if (macio_resource_count(mdev) < 2) {

		printk(KERN_WARNING "ifd%d: no address for %s\n",

		       index, swim->full_name);

		swim3_err("%s", "No address in device-tree\n");

		return -ENXIO;

	}

	if (macio_irq_count(mdev) < 2) {

		printk(KERN_WARNING "fd%d: no intrs for device %s\n",

			index, swim->full_name);

	if (macio_irq_count(mdev) < 1) {

		swim3_err("%s", "No interrupt in device-tree\n");

		return -ENXIO;

	}

	if (macio_request_resource(mdev, 0, "swim3 (mmio)")) {

		printk(KERN_ERR "fd%d: can't request mmio resource for %s\n",

		       index, swim->full_name);

		swim3_err("%s", "Can't request mmio resource\n");

		return -EBUSY;

	}

	if (macio_request_resource(mdev, 1, "swim3 (dma)")) {

		printk(KERN_ERR "fd%d: can't request dma resource for %s\n",

		       index, swim->full_name);

		swim3_err("%s", "Can't request dma resource\n");

		macio_release_resource(mdev, 0);

		return -EBUSY;

	}
@@ -1063,22 +1137,18 @@ static int swim3_add_device(struct macio_dev *mdev, int index) 
	if (mdev->media_bay == NULL)

		pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 1);

	

	memset(fs, 0, sizeof(*fs));

	spin_lock_init(&fs->lock);

	fs->state = idle;

	fs->swim3 = (struct swim3 __iomem *)

		ioremap(macio_resource_start(mdev, 0), 0x200);

	if (fs->swim3 == NULL) {

		printk("fd%d: couldn't map registers for %s\n",

		       index, swim->full_name);

		swim3_err("%s", "Couldn't map mmio registers\n");

		rc = -ENOMEM;

		goto out_release;

	}

	fs->dma = (struct dbdma_regs __iomem *)

		ioremap(macio_resource_start(mdev, 1), 0x200);

	if (fs->dma == NULL) {

		printk("fd%d: couldn't map DMA for %s\n",

		       index, swim->full_name);

		swim3_err("%s", "Couldn't map dma registers\n");

		iounmap(fs->swim3);

		rc = -ENOMEM;

		goto out_release;
@@ -1090,31 +1160,25 @@ static int swim3_add_device(struct macio_dev *mdev, int index) 
	fs->secpercyl = 36;

	fs->secpertrack = 18;

	fs->total_secs = 2880;

	fs->mdev = mdev;

	init_waitqueue_head(&fs->wait);



	fs->dma_cmd = (struct dbdma_cmd *) DBDMA_ALIGN(fs->dbdma_cmd_space);

	memset(fs->dma_cmd, 0, 2 * sizeof(struct dbdma_cmd));

	st_le16(&fs->dma_cmd[1].command, DBDMA_STOP);



	if (mdev->media_bay == NULL || check_media_bay(mdev->media_bay) == MB_FD)

		swim3_mb_event(mdev, MB_FD);



	if (request_irq(fs->swim3_intr, swim3_interrupt, 0, "SWIM3", fs)) {

		printk(KERN_ERR "fd%d: couldn't request irq %d for %s\n",

		       index, fs->swim3_intr, swim->full_name);

		swim3_err("%s", "Couldn't request interrupt\n");

		pmac_call_feature(PMAC_FTR_SWIM3_ENABLE, swim, 0, 0);

		goto out_unmap;

		return -EBUSY;

	}

/*

	if (request_irq(fs->dma_intr, fd_dma_interrupt, 0, "SWIM3-dma", fs)) {

		printk(KERN_ERR "Couldn't get irq %d for SWIM3 DMA",

		       fs->dma_intr);

		return -EBUSY;

	}

*/



	init_timer(&fs->timeout);



	printk(KERN_INFO "fd%d: SWIM3 floppy controller %s\n", floppy_count,

	swim3_info("SWIM3 floppy controller %s\n",

		mdev->media_bay ? "in media bay" : "");



	return 0;
@@ -1132,41 +1196,42 @@ static int swim3_add_device(struct macio_dev *mdev, int index) 


static int __devinit swim3_attach(struct macio_dev *mdev, const struct of_device_id *match)

{

	int i, rc;

	struct gendisk *disk;

	int index, rc;



	index = floppy_count++;

	if (index >= MAX_FLOPPIES)

		return -ENXIO;



	/* Add the drive */

	rc = swim3_add_device(mdev, floppy_count);

	rc = swim3_add_device(mdev, index);

	if (rc)

		return rc;

	/* Now register that disk. Same comment about failure handling */

	disk = disks[index] = alloc_disk(1);

	if (disk == NULL)

		return -ENOMEM;

	disk->queue = blk_init_queue(do_fd_request, &swim3_lock);

	if (disk->queue == NULL) {

		put_disk(disk);

		return -ENOMEM;

	}

	disk->queue->queuedata = &floppy_states[index];



	/* Now create the queue if not there yet */

	if (swim3_queue == NULL) {

	if (index == 0) {

		/* If we failed, there isn't much we can do as the driver is still

		 * too dumb to remove the device, just bail out

		 */

		if (register_blkdev(FLOPPY_MAJOR, "fd"))

			return 0;

		swim3_queue = blk_init_queue(do_fd_request, &swim3_lock);

		if (swim3_queue == NULL) {

			unregister_blkdev(FLOPPY_MAJOR, "fd");

			return 0;

		}

	}



	/* Now register that disk. Same comment about failure handling */

	i = floppy_count++;

	disk = disks[i] = alloc_disk(1);

	if (disk == NULL)

		return 0;



	disk->major = FLOPPY_MAJOR;

	disk->first_minor = i;

	disk->first_minor = index;

	disk->fops = &floppy_fops;

	disk->private_data = &floppy_states[i];

	disk->queue = swim3_queue;

	disk->private_data = &floppy_states[index];

	disk->flags |= GENHD_FL_REMOVABLE;

	sprintf(disk->disk_name, "fd%d", i);

	sprintf(disk->disk_name, "fd%d", index);

	set_capacity(disk, 2880);

	add_disk(disk);
@@ -1194,6 +1259,9 @@ static struct macio_driver swim3_driver = 
		.of_match_table	= swim3_match,

	},

	.probe		= swim3_attach,

#ifdef CONFIG_PMAC_MEDIABAY

	.mediabay_event	= swim3_mb_event,

#endif

#if 0

	.suspend	= swim3_suspend,

	.resume		= swim3_resume,

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