Merge tag 'trace-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Don't destroy user event fields when removal fails

   User event fields are destroyed before the event is removed from
   visibility. But that can fail leaving the still visible event with no
   fields. Move the destroying of the fields to after the event is
   successfully removed from visibility.

 - Initialize function graph state is fork before calling
   copy_exec_state()

   For non-CLONE_VM forks, copy_exec_state() allocates a new
   task_exec_state. If that allocation fails, ftrace_graph_exit_task()
   will free the tasks ret_stack pointer. Since that pointer is still
   using the parent's ret_stack, it mistakenly frees the parent's
   pointer too.

   Call ftrace_graph_init() on the task first which will NULL out the
   new tasks's ret_stack and if the copy fails, it will not free
   anything.

 - Remove FGRAPH_MAX_INDEX

   The macro FGRAPH_MAX_INDEX was added but never used. Remove it.

 - Save ent_size in function graph printing of nested functions

   The function graph tracer needs to look at the next event to see if
   the next event is the return of the current function entry. If it is,
   it prints a single line:

	ktime_get();

   Otherwise it prints it like a nested function:

	tick_nohz_irq_exit() {
	    ktime_get();
	    kcpustat_irq_exit();
	}

   In order to look at the next event, it must save the current event so
   that it has the information to print from it. It saves the event in
   the iterator descriptor called "ent". What it doesn't save is the
   ent_size of the event which is now used to know if the function graph
   arguments are to be printed. The peek doesn't save the size so the
   size used happens to be that of the size of the last event that was
   seen.

   Save the entry event size in the iterator descriptor so that the
   correct size is used.

 - Fix several errors with freeing data in the histogram code

   The histogram code had a lot of leaked or or incorrect accounting
   when failures happen. Correct them.

 - Fix histogram regression of .percent and .graph modifiers

   Up until 6.3 histogram values could have "percent" or "graph"
   modifiers that changed how they were printed. But a change that added
   restricting histograms values from being strings, stack traces and
   other modifiers inadvertently prevented them from using the percent
   and graph modifiers, which were legal use cases for values.

   Put back the percent and graph modifiers.

 - Fix various typos in the comments

 - Set the trace_clock before initializing a histogram with clock
   argument

   The histogram API allows the user to specific which trace clock to
   use via a "clock=" string. The histogram is set up first before the
   clock is checked. If the passed in clock is not valid, it exits
   without fully fixing up the histogram leaving it on the list and a
   use-after-free can trigger.

   Update the clock argument first and if it fails then exit gracefully
   before the histogram trigger is placed on any lists.

 - Restore :mod: trailer after parsing in ftrace_set_clr_event

   The function ftrace_set_clr_event() modifies the parse string and
   needs to put it back to what was passed in. It searches for ":mod:"
   via a strsep() but fails to put back the first ':' in the string.

   Add back the ':' in the passed in string.

 - Take trace_array reference when opening a tracer options file

   The options files are dynamically created and some tracers add their
   own options. When a tracer adds their own list of options, the
   trace_array holding them has an array to hold the list of options for
   each tracer. This array increases in size via a krealloc(), and the
   new entry gets a newly allocated array to hold the options of the new
   tracer being added.

   The element in each entry of the tracer's option array holds a
   pointer back to the trace_array, a pointer to the tracer it is
   associated to, a pointer to the flags of the option.

   The issue is that these arrays are freed when the trace_array is
   freed when its instance it represents is removed from the instances
   directory. There's a race that an open of one of these options files
   can happen when the instance is being removed.

   Add a new helper function to be called by the open function of the
   options file to iterate all existing trace_arrays under a lock and
   find the one that has the given option element in one of it's tracer
   arrays. If found, then update the associated trace_array's reference
   counter to keep it from being freed. If not found, have the open call
   return -ENODEV.

 - Disable interrupts when acquiring the lock in rb_wake_up_waiters()

   The function rb_wake_up_waiters() assumes it will be called in
   interrupt context and does not disable irqs when taking
   cpu_buffer->reader_lock, which can be called in hard interrupt
   context. The issue is in PREEMPT_RT, this function is called in
   thread context leaving this lock open to a deadlock.

   Take the lock with interrupts disabled.

 - Use rcu_assign_pointer() for tmp_ops filter hash

   The tmp_ops used in update_ftrace_direct_mod() assigns its
   filter_hash field directly, but that field is annotated as __rcu and
   sparse complains. Assign it with rcu_assign_pointer()

 - Fix use-after-free in enable_trigger_private_data_free()

   The trace_event_call is accessed through the event_trigger_data's
   trace_event_file pointer to put the trace_event_call on freeing. The
   issue is that the trace_event_file data may have been freed already
   causing a use-after-free. Add a field to the event_trigger_data that
   points directly to the trace_event_call so that it can decrement its
   reference directly without needing to go through the
   trace_event_file.

 - Fix accounting of buffer data remote headers

   trace_buffer_desc_size() and trace_remote_alloc_buffer() undercount
   the number of pages is needed for the asked for size as it doesn't
   take into account the meta data on each page. Add a helper function
   to do the calculation properly and use that in these functions.

 - Catch nr_page_va overflow in ring_buffer_desc sizing

   The number of pages per remote ring buffer is capped by
   ring_buffer_desc::nr_page_va (32 bits). A buffer_size large enough to
   overflow that field would silently allocate a descriptor smaller than
   what was asked for.

 - Do not resize the subbuf order if any per_cpu buffer is disabled

   The mmapping of ring buffers disables resizing the subbuffers, but it
   is done per-cpu whereas the subbuf size change is done for all the
   per_cpu buffers under the buffer->mutex. It could change the size of
   some while the mapping is happening on others. Have the resize of the
   subbuf order check all the per_cpu buffers under the lock to see if
   any of them is disabled before starting and causing an inconsistency
   between buffers that are being mapped.

* tag 'trace-v7.3-rc2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace: (25 commits)
  ring-buffer: Check resize_disabled before publishing the new subbuf order
  tracing/remotes: Catch nr_page_va overflow in ring_buffer_desc sizing
  tracing/remotes: Account for ring buffer page header in size calculation
  tracing: Don't dereference trace_event_file in deferred trigger free
  ftrace: Use rcu_assign_pointer() for tmp_ops filter hash
  ring-buffer: Acquire the lock with irqsave in rb_wake_up_waiters()
  tracing: Take trace_array reference when opening a tracer options file
  tracing: Fix ring_buffer_read_page_size() kernel-doc
  tracing: Restore :mod: trailer after parsing in ftrace_set_clr_event()
  tracing: Fix memory corruption from a "STACKTRACE" histogram key
  tracing: Fix memory corruption from the histogram stacktrace modifier
  tracing: Undo the registration when enabling the histogram trigger fails
  tracing: Take the reference before publishing the named histogram trigger
  tracing: Set the trace clock before registering the histogram trigger
  tracing: Fix typo "preceeded" in comment
  tracing: Fix typo "availabe" in comment
  tracing: Let histogram values keep the percent and graph modifiers
  tracing: Keep the entry count when the histogram stats allocation fails
  tracing: Free histogram the field rejected for a bad modifier
  tracing: Free histogram the var ref when its initialization fails
  ...

1 files changed, 560 insertions, 0 deletions

diff --git a/drivers/block/ps3disk.c b/drivers/block/ps3disk.c
new file mode 100644
index 000000000..700dd0552
--- /dev/null
+++ b/drivers/block/ps3disk.c
@@ -0,0 +1,560 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * PS3 Disk Storage Driver
+ *
+ * Copyright (C) 2007 Sony Computer Entertainment Inc.
+ * Copyright 2007 Sony Corp.
+ */
+
+#include <linux/ata.h>
+#include <linux/blk-mq.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+
+#include <asm/lv1call.h>
+#include <asm/ps3stor.h>
+#include <asm/firmware.h>
+
+
+#define DEVICE_NAME		"ps3disk"
+
+#define BOUNCE_SIZE		(64*1024)
+
+#define PS3DISK_MAX_DISKS	16
+#define PS3DISK_MINORS		16
+
+
+#define PS3DISK_NAME		"ps3d%c"
+
+
+struct ps3disk_private {
+	spinlock_t lock;		/* Request queue spinlock */
+	struct blk_mq_tag_set tag_set;
+	struct gendisk *gendisk;
+	unsigned int blocking_factor;
+	struct request *req;
+	u64 raw_capacity;
+	unsigned char model[ATA_ID_PROD_LEN+1];
+};
+
+
+#define LV1_STORAGE_SEND_ATA_COMMAND	(2)
+#define LV1_STORAGE_ATA_HDDOUT		(0x23)
+
+struct lv1_ata_cmnd_block {
+	u16	features;
+	u16	sector_count;
+	u16	LBA_low;
+	u16	LBA_mid;
+	u16	LBA_high;
+	u8	device;
+	u8	command;
+	u32	is_ext;
+	u32	proto;
+	u32	in_out;
+	u32	size;
+	u64	buffer;
+	u32	arglen;
+};
+
+enum lv1_ata_proto {
+	NON_DATA_PROTO     = 0,
+	PIO_DATA_IN_PROTO  = 1,
+	PIO_DATA_OUT_PROTO = 2,
+	DMA_PROTO = 3
+};
+
+enum lv1_ata_in_out {
+	DIR_WRITE = 0,			/* memory -> device */
+	DIR_READ = 1			/* device -> memory */
+};
+
+static int ps3disk_major;
+
+
+static const struct block_device_operations ps3disk_fops = {
+	.owner		= THIS_MODULE,
+};
+
+
+static void ps3disk_scatter_gather(struct ps3_storage_device *dev,
+				   struct request *req, int gather)
+{
+	unsigned int offset = 0;
+	struct req_iterator iter;
+	struct bio_vec bvec;
+
+	rq_for_each_segment(bvec, req, iter) {
+		dev_dbg(&dev->sbd.core, "%s:%u: %u sectors from %llu\n",
+			__func__, __LINE__, bio_sectors(iter.bio),
+			iter.bio->bi_iter.bi_sector);
+		if (gather)
+			memcpy_from_bvec(dev->bounce_buf + offset, &bvec);
+		else
+			memcpy_to_bvec(&bvec, dev->bounce_buf + offset);
+		offset += bvec.bv_len;
+	}
+}
+
+static blk_status_t ps3disk_submit_request_sg(struct ps3_storage_device *dev,
+					      struct request *req)
+{
+	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
+	int write = rq_data_dir(req), res;
+	const char *op = write ? "write" : "read";
+	u64 start_sector, sectors;
+	unsigned int region_id = dev->regions[dev->region_idx].id;
+
+#ifdef DEBUG
+	unsigned int n = 0;
+	struct bio_vec bv;
+	struct req_iterator iter;
+
+	rq_for_each_segment(bv, req, iter)
+		n++;
+	dev_dbg(&dev->sbd.core,
+		"%s:%u: %s req has %u bvecs for %u sectors\n",
+		__func__, __LINE__, op, n, blk_rq_sectors(req));
+#endif
+
+	start_sector = blk_rq_pos(req) * priv->blocking_factor;
+	sectors = blk_rq_sectors(req) * priv->blocking_factor;
+	dev_dbg(&dev->sbd.core, "%s:%u: %s %llu sectors starting at %llu\n",
+		__func__, __LINE__, op, sectors, start_sector);
+
+	if (write) {
+		ps3disk_scatter_gather(dev, req, 1);
+
+		res = lv1_storage_write(dev->sbd.dev_id, region_id,
+					start_sector, sectors, 0,
+					dev->bounce_lpar, &dev->tag);
+	} else {
+		res = lv1_storage_read(dev->sbd.dev_id, region_id,
+				       start_sector, sectors, 0,
+				       dev->bounce_lpar, &dev->tag);
+	}
+	if (res) {
+		dev_err(&dev->sbd.core, "%s:%u: %s failed %d\n", __func__,
+			__LINE__, op, res);
+		return BLK_STS_IOERR;
+	}
+
+	priv->req = req;
+	return BLK_STS_OK;
+}
+
+static blk_status_t ps3disk_submit_flush_request(struct ps3_storage_device *dev,
+						 struct request *req)
+{
+	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
+	u64 res;
+
+	dev_dbg(&dev->sbd.core, "%s:%u: flush request\n", __func__, __LINE__);
+
+	res = lv1_storage_send_device_command(dev->sbd.dev_id,
+					      LV1_STORAGE_ATA_HDDOUT, 0, 0, 0,
+					      0, &dev->tag);
+	if (res) {
+		dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
+			__func__, __LINE__, res);
+		return BLK_STS_IOERR;
+	}
+
+	priv->req = req;
+	return BLK_STS_OK;
+}
+
+static blk_status_t ps3disk_do_request(struct ps3_storage_device *dev,
+				       struct request *req)
+{
+	dev_dbg(&dev->sbd.core, "%s:%u\n", __func__, __LINE__);
+
+	switch (req_op(req)) {
+	case REQ_OP_FLUSH:
+		return ps3disk_submit_flush_request(dev, req);
+	case REQ_OP_READ:
+	case REQ_OP_WRITE:
+		return ps3disk_submit_request_sg(dev, req);
+	default:
+		blk_dump_rq_flags(req, DEVICE_NAME " bad request");
+		return BLK_STS_IOERR;
+	}
+}
+
+static blk_status_t ps3disk_queue_rq(struct blk_mq_hw_ctx *hctx,
+				     const struct blk_mq_queue_data *bd)
+{
+	struct request_queue *q = hctx->queue;
+	struct ps3_storage_device *dev = q->queuedata;
+	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
+	blk_status_t ret;
+
+	blk_mq_start_request(bd->rq);
+
+	spin_lock_irq(&priv->lock);
+	ret = ps3disk_do_request(dev, bd->rq);
+	spin_unlock_irq(&priv->lock);
+
+	return ret;
+}
+
+static irqreturn_t ps3disk_interrupt(int irq, void *data)
+{
+	struct ps3_storage_device *dev = data;
+	struct ps3disk_private *priv;
+	struct request *req;
+	int res, read;
+	blk_status_t error;
+	u64 tag, status;
+	const char *op;
+
+	res = lv1_storage_get_async_status(dev->sbd.dev_id, &tag, &status);
+
+	if (tag != dev->tag)
+		dev_err(&dev->sbd.core,
+			"%s:%u: tag mismatch, got %llx, expected %llx\n",
+			__func__, __LINE__, tag, dev->tag);
+
+	if (res) {
+		dev_err(&dev->sbd.core, "%s:%u: res=%d status=0x%llx\n",
+			__func__, __LINE__, res, status);
+		return IRQ_HANDLED;
+	}
+
+	priv = ps3_system_bus_get_drvdata(&dev->sbd);
+	req = priv->req;
+	if (!req) {
+		dev_dbg(&dev->sbd.core,
+			"%s:%u non-block layer request completed\n", __func__,
+			__LINE__);
+		dev->lv1_status = status;
+		complete(&dev->done);
+		return IRQ_HANDLED;
+	}
+
+	if (req_op(req) == REQ_OP_FLUSH) {
+		read = 0;
+		op = "flush";
+	} else {
+		read = !rq_data_dir(req);
+		op = read ? "read" : "write";
+	}
+	if (status) {
+		dev_dbg(&dev->sbd.core, "%s:%u: %s failed 0x%llx\n", __func__,
+			__LINE__, op, status);
+		error = BLK_STS_IOERR;
+	} else {
+		dev_dbg(&dev->sbd.core, "%s:%u: %s completed\n", __func__,
+			__LINE__, op);
+		error = 0;
+		if (read)
+			ps3disk_scatter_gather(dev, req, 0);
+	}
+
+	spin_lock(&priv->lock);
+	priv->req = NULL;
+	blk_mq_end_request(req, error);
+	spin_unlock(&priv->lock);
+
+	blk_mq_run_hw_queues(priv->gendisk->queue, true);
+	return IRQ_HANDLED;
+}
+
+static int ps3disk_sync_cache(struct ps3_storage_device *dev)
+{
+	u64 res;
+
+	dev_dbg(&dev->sbd.core, "%s:%u: sync cache\n", __func__, __LINE__);
+
+	res = ps3stor_send_command(dev, LV1_STORAGE_ATA_HDDOUT, 0, 0, 0, 0);
+	if (res) {
+		dev_err(&dev->sbd.core, "%s:%u: sync cache failed 0x%llx\n",
+			__func__, __LINE__, res);
+		return -EIO;
+	}
+	return 0;
+}
+
+
+/* ATA helpers copied from drivers/ata/libata-core.c */
+
+static void swap_buf_le16(u16 *buf, unsigned int buf_words)
+{
+#ifdef __BIG_ENDIAN
+	unsigned int i;
+
+	for (i = 0; i < buf_words; i++)
+		buf[i] = le16_to_cpu(buf[i]);
+#endif /* __BIG_ENDIAN */
+}
+
+static u64 ata_id_n_sectors(const u16 *id)
+{
+	if (ata_id_has_lba(id)) {
+		if (ata_id_has_lba48(id))
+			return ata_id_u64(id, 100);
+		else
+			return ata_id_u32(id, 60);
+	} else {
+		if (ata_id_current_chs_valid(id))
+			return ata_id_u32(id, 57);
+		else
+			return id[1] * id[3] * id[6];
+	}
+}
+
+static void ata_id_string(const u16 *id, unsigned char *s, unsigned int ofs,
+			  unsigned int len)
+{
+	unsigned int c;
+
+	while (len > 0) {
+		c = id[ofs] >> 8;
+		*s = c;
+		s++;
+
+		c = id[ofs] & 0xff;
+		*s = c;
+		s++;
+
+		ofs++;
+		len -= 2;
+	}
+}
+
+static void ata_id_c_string(const u16 *id, unsigned char *s, unsigned int ofs,
+			    unsigned int len)
+{
+	unsigned char *p;
+
+	WARN_ON(!(len & 1));
+
+	ata_id_string(id, s, ofs, len - 1);
+
+	p = s + strnlen(s, len - 1);
+	while (p > s && p[-1] == ' ')
+		p--;
+	*p = '\0';
+}
+
+static int ps3disk_identify(struct ps3_storage_device *dev)
+{
+	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
+	struct lv1_ata_cmnd_block ata_cmnd;
+	u16 *id = dev->bounce_buf;
+	u64 res;
+
+	dev_dbg(&dev->sbd.core, "%s:%u: identify disk\n", __func__, __LINE__);
+
+	memset(&ata_cmnd, 0, sizeof(struct lv1_ata_cmnd_block));
+	ata_cmnd.command = ATA_CMD_ID_ATA;
+	ata_cmnd.sector_count = 1;
+	ata_cmnd.size = ata_cmnd.arglen = ATA_ID_WORDS * 2;
+	ata_cmnd.buffer = dev->bounce_lpar;
+	ata_cmnd.proto = PIO_DATA_IN_PROTO;
+	ata_cmnd.in_out = DIR_READ;
+
+	res = ps3stor_send_command(dev, LV1_STORAGE_SEND_ATA_COMMAND,
+				   ps3_mm_phys_to_lpar(__pa(&ata_cmnd)),
+				   sizeof(ata_cmnd), ata_cmnd.buffer,
+				   ata_cmnd.arglen);
+	if (res) {
+		dev_err(&dev->sbd.core, "%s:%u: identify disk failed 0x%llx\n",
+			__func__, __LINE__, res);
+		return -EIO;
+	}
+
+	swap_buf_le16(id, ATA_ID_WORDS);
+
+	/* All we're interested in are raw capacity and model name */
+	priv->raw_capacity = ata_id_n_sectors(id);
+	ata_id_c_string(id, priv->model, ATA_ID_PROD, sizeof(priv->model));
+	return 0;
+}
+
+static unsigned long ps3disk_mask;
+
+static DEFINE_MUTEX(ps3disk_mask_mutex);
+
+static const struct blk_mq_ops ps3disk_mq_ops = {
+	.queue_rq	= ps3disk_queue_rq,
+};
+
+static int ps3disk_probe(struct ps3_system_bus_device *_dev)
+{
+	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
+	struct ps3disk_private *priv;
+	int error;
+	unsigned int devidx;
+	struct queue_limits lim = {
+		.logical_block_size	= dev->blk_size,
+		.max_hw_sectors		= BOUNCE_SIZE >> 9,
+		.max_segments		= -1,
+		.max_segment_size	= BOUNCE_SIZE,
+		.dma_alignment		= dev->blk_size - 1,
+		.features		= BLK_FEAT_WRITE_CACHE |
+					  BLK_FEAT_ROTATIONAL,
+	};
+	struct gendisk *gendisk;
+
+	if (dev->blk_size < 512) {
+		dev_err(&dev->sbd.core,
+			"%s:%u: cannot handle block size %llu\n", __func__,
+			__LINE__, dev->blk_size);
+		return -EINVAL;
+	}
+
+	BUILD_BUG_ON(PS3DISK_MAX_DISKS > BITS_PER_LONG);
+	mutex_lock(&ps3disk_mask_mutex);
+	devidx = find_first_zero_bit(&ps3disk_mask, PS3DISK_MAX_DISKS);
+	if (devidx >= PS3DISK_MAX_DISKS) {
+		dev_err(&dev->sbd.core, "%s:%u: Too many disks\n", __func__,
+			__LINE__);
+		mutex_unlock(&ps3disk_mask_mutex);
+		return -ENOSPC;
+	}
+	__set_bit(devidx, &ps3disk_mask);
+	mutex_unlock(&ps3disk_mask_mutex);
+
+	priv = kzalloc_obj(*priv);
+	if (!priv) {
+		error = -ENOMEM;
+		goto fail;
+	}
+
+	ps3_system_bus_set_drvdata(_dev, priv);
+	spin_lock_init(&priv->lock);
+
+	dev->bounce_size = BOUNCE_SIZE;
+	dev->bounce_buf = kmalloc(BOUNCE_SIZE, GFP_DMA);
+	if (!dev->bounce_buf) {
+		error = -ENOMEM;
+		goto fail_free_priv;
+	}
+
+	error = ps3stor_setup(dev, ps3disk_interrupt);
+	if (error)
+		goto fail_free_bounce;
+
+	ps3disk_identify(dev);
+
+	error = blk_mq_alloc_sq_tag_set(&priv->tag_set, &ps3disk_mq_ops, 1, 0);
+	if (error)
+		goto fail_teardown;
+
+	gendisk = blk_mq_alloc_disk(&priv->tag_set, &lim, dev);
+	if (IS_ERR(gendisk)) {
+		dev_err(&dev->sbd.core, "%s:%u: blk_mq_alloc_disk failed\n",
+			__func__, __LINE__);
+		error = PTR_ERR(gendisk);
+		goto fail_free_tag_set;
+	}
+
+	priv->gendisk = gendisk;
+	gendisk->major = ps3disk_major;
+	gendisk->first_minor = devidx * PS3DISK_MINORS;
+	gendisk->minors = PS3DISK_MINORS;
+	gendisk->fops = &ps3disk_fops;
+	gendisk->private_data = dev;
+	snprintf(gendisk->disk_name, sizeof(gendisk->disk_name), PS3DISK_NAME,
+		 devidx+'a');
+	priv->blocking_factor = dev->blk_size >> 9;
+	set_capacity(gendisk,
+		     dev->regions[dev->region_idx].size*priv->blocking_factor);
+
+	dev_info(&dev->sbd.core,
+		 "%s is a %s (%llu MiB total, %llu MiB for OtherOS)\n",
+		 gendisk->disk_name, priv->model, priv->raw_capacity >> 11,
+		 get_capacity(gendisk) >> 11);
+
+	error = device_add_disk(&dev->sbd.core, gendisk, NULL);
+	if (error)
+		goto fail_cleanup_disk;
+
+	return 0;
+fail_cleanup_disk:
+	put_disk(gendisk);
+fail_free_tag_set:
+	blk_mq_free_tag_set(&priv->tag_set);
+fail_teardown:
+	ps3stor_teardown(dev);
+fail_free_bounce:
+	kfree(dev->bounce_buf);
+fail_free_priv:
+	kfree(priv);
+	ps3_system_bus_set_drvdata(_dev, NULL);
+fail:
+	mutex_lock(&ps3disk_mask_mutex);
+	__clear_bit(devidx, &ps3disk_mask);
+	mutex_unlock(&ps3disk_mask_mutex);
+	return error;
+}
+
+static void ps3disk_remove(struct ps3_system_bus_device *_dev)
+{
+	struct ps3_storage_device *dev = to_ps3_storage_device(&_dev->core);
+	struct ps3disk_private *priv = ps3_system_bus_get_drvdata(&dev->sbd);
+
+	mutex_lock(&ps3disk_mask_mutex);
+	__clear_bit(MINOR(disk_devt(priv->gendisk)) / PS3DISK_MINORS,
+		    &ps3disk_mask);
+	mutex_unlock(&ps3disk_mask_mutex);
+	del_gendisk(priv->gendisk);
+	put_disk(priv->gendisk);
+	blk_mq_free_tag_set(&priv->tag_set);
+	dev_notice(&dev->sbd.core, "Synchronizing disk cache\n");
+	ps3disk_sync_cache(dev);
+	ps3stor_teardown(dev);
+	kfree(dev->bounce_buf);
+	kfree(priv);
+	ps3_system_bus_set_drvdata(_dev, NULL);
+}
+
+static struct ps3_system_bus_driver ps3disk = {
+	.match_id	= PS3_MATCH_ID_STOR_DISK,
+	.core.name	= DEVICE_NAME,
+	.core.owner	= THIS_MODULE,
+	.probe		= ps3disk_probe,
+	.remove		= ps3disk_remove,
+	.shutdown	= ps3disk_remove,
+};
+
+
+static int __init ps3disk_init(void)
+{
+	int error;
+
+	if (!firmware_has_feature(FW_FEATURE_PS3_LV1))
+		return -ENODEV;
+
+	error = register_blkdev(0, DEVICE_NAME);
+	if (error <= 0) {
+		printk(KERN_ERR "%s:%u: register_blkdev failed %d\n", __func__,
+		       __LINE__, error);
+		return error;
+	}
+	ps3disk_major = error;
+
+	pr_info("%s:%u: registered block device major %d\n", __func__,
+		__LINE__, ps3disk_major);
+
+	error = ps3_system_bus_driver_register(&ps3disk);
+	if (error)
+		unregister_blkdev(ps3disk_major, DEVICE_NAME);
+
+	return error;
+}
+
+static void __exit ps3disk_exit(void)
+{
+	ps3_system_bus_driver_unregister(&ps3disk);
+	unregister_blkdev(ps3disk_major, DEVICE_NAME);
+}
+
+module_init(ps3disk_init);
+module_exit(ps3disk_exit);
+
+MODULE_LICENSE("GPL");
+MODULE_DESCRIPTION("PS3 Disk Storage Driver");
+MODULE_AUTHOR("Sony Corporation");
+MODULE_ALIAS(PS3_MODULE_ALIAS_STOR_DISK);