[linux.git] / block / bsg-lib.c

/*
 *  BSG helper library
 *
 *  Copyright (C) 2008   James Smart, Emulex Corporation
 *  Copyright (C) 2011   Red Hat, Inc.  All rights reserved.
 *  Copyright (C) 2011   Mike Christie
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License as published by
 *  the Free Software Foundation; either version 2 of the License, or
 *  (at your option) any later version.
 *
 *  This program is distributed in the hope that it will be useful,
 *  but WITHOUT ANY WARRANTY; without even the implied warranty of
 *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 *  GNU General Public License for more details.
 *
 *  You should have received a copy of the GNU General Public License
 *  along with this program; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 *
 */
#include <linux/slab.h>
#include <linux/blkdev.h>
#include <linux/delay.h>
#include <linux/scatterlist.h>
#include <linux/bsg-lib.h>
#include <linux/export.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/sg.h>

#define uptr64(val) ((void __user *)(uintptr_t)(val))

static int bsg_transport_check_proto(struct sg_io_v4 *hdr)
{
	if (hdr->protocol != BSG_PROTOCOL_SCSI  ||
	    hdr->subprotocol != BSG_SUB_PROTOCOL_SCSI_TRANSPORT)
		return -EINVAL;
	if (!capable(CAP_SYS_RAWIO))
		return -EPERM;
	return 0;
}

static int bsg_transport_fill_hdr(struct request *rq, struct sg_io_v4 *hdr,
		fmode_t mode)
{
	struct bsg_job *job = blk_mq_rq_to_pdu(rq);

	job->request_len = hdr->request_len;
	job->request = memdup_user(uptr64(hdr->request), hdr->request_len);

	return PTR_ERR_OR_ZERO(job->request);
}

static int bsg_transport_complete_rq(struct request *rq, struct sg_io_v4 *hdr)
{
	struct bsg_job *job = blk_mq_rq_to_pdu(rq);
	int ret = 0;

	/*
	 * The assignments below don't make much sense, but are kept for
	 * bug by bug backwards compatibility:
	 */
	hdr->device_status = job->result & 0xff;
	hdr->transport_status = host_byte(job->result);
	hdr->driver_status = driver_byte(job->result);
	hdr->info = 0;
	if (hdr->device_status || hdr->transport_status || hdr->driver_status)
		hdr->info |= SG_INFO_CHECK;
	hdr->response_len = 0;

	if (job->result < 0) {
		/* we're only returning the result field in the reply */
		job->reply_len = sizeof(u32);
		ret = job->result;
	}

	if (job->reply_len && hdr->response) {
		int len = min(hdr->max_response_len, job->reply_len);

		if (copy_to_user(uptr64(hdr->response), job->reply, len))
			ret = -EFAULT;
		else
			hdr->response_len = len;
	}

	/* we assume all request payload was transferred, residual == 0 */
	hdr->dout_resid = 0;

	if (rq->next_rq) {
		unsigned int rsp_len = job->reply_payload.payload_len;

		if (WARN_ON(job->reply_payload_rcv_len > rsp_len))
			hdr->din_resid = 0;
		else
			hdr->din_resid = rsp_len - job->reply_payload_rcv_len;
	} else {
		hdr->din_resid = 0;
	}

	return ret;
}

static void bsg_transport_free_rq(struct request *rq)
{
	struct bsg_job *job = blk_mq_rq_to_pdu(rq);

	kfree(job->request);
}

static const struct bsg_ops bsg_transport_ops = {
	.check_proto		= bsg_transport_check_proto,
	.fill_hdr		= bsg_transport_fill_hdr,
	.complete_rq		= bsg_transport_complete_rq,
	.free_rq		= bsg_transport_free_rq,
};

/**
 * bsg_teardown_job - routine to teardown a bsg job
 * @kref: kref inside bsg_job that is to be torn down
 */
static void bsg_teardown_job(struct kref *kref)
{
	struct bsg_job *job = container_of(kref, struct bsg_job, kref);
	struct request *rq = blk_mq_rq_from_pdu(job);

	put_device(job->dev);	/* release reference for the request */

	kfree(job->request_payload.sg_list);
	kfree(job->reply_payload.sg_list);

	blk_end_request_all(rq, BLK_STS_OK);
}

void bsg_job_put(struct bsg_job *job)
{
	kref_put(&job->kref, bsg_teardown_job);
}
EXPORT_SYMBOL_GPL(bsg_job_put);

int bsg_job_get(struct bsg_job *job)
{
	return kref_get_unless_zero(&job->kref);
}
EXPORT_SYMBOL_GPL(bsg_job_get);

/**
 * bsg_job_done - completion routine for bsg requests
 * @job: bsg_job that is complete
 * @result: job reply result
 * @reply_payload_rcv_len: length of payload recvd
 *
 * The LLD should call this when the bsg job has completed.
 */
void bsg_job_done(struct bsg_job *job, int result,
		  unsigned int reply_payload_rcv_len)
{
	job->result = result;
	job->reply_payload_rcv_len = reply_payload_rcv_len;
	blk_complete_request(blk_mq_rq_from_pdu(job));
}
EXPORT_SYMBOL_GPL(bsg_job_done);

/**
 * bsg_softirq_done - softirq done routine for destroying the bsg requests
 * @rq: BSG request that holds the job to be destroyed
 */
static void bsg_softirq_done(struct request *rq)
{
	struct bsg_job *job = blk_mq_rq_to_pdu(rq);

	bsg_job_put(job);
}

static int bsg_map_buffer(struct bsg_buffer *buf, struct request *req)
{
	size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);

	BUG_ON(!req->nr_phys_segments);

	buf->sg_list = kzalloc(sz, GFP_KERNEL);
	if (!buf->sg_list)
		return -ENOMEM;
	sg_init_table(buf->sg_list, req->nr_phys_segments);
	buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
	buf->payload_len = blk_rq_bytes(req);
	return 0;
}

/**
 * bsg_prepare_job - create the bsg_job structure for the bsg request
 * @dev: device that is being sent the bsg request
 * @req: BSG request that needs a job structure
 */
static bool bsg_prepare_job(struct device *dev, struct request *req)
{
	struct request *rsp = req->next_rq;
	struct bsg_job *job = blk_mq_rq_to_pdu(req);
	int ret;

	job->timeout = req->timeout;

	if (req->bio) {
		ret = bsg_map_buffer(&job->request_payload, req);
		if (ret)
			goto failjob_rls_job;
	}
	if (rsp && rsp->bio) {
		ret = bsg_map_buffer(&job->reply_payload, rsp);
		if (ret)
			goto failjob_rls_rqst_payload;
	}
	job->dev = dev;
	/* take a reference for the request */
	get_device(job->dev);
	kref_init(&job->kref);
	return true;

failjob_rls_rqst_payload:
	kfree(job->request_payload.sg_list);
failjob_rls_job:
	job->result = -ENOMEM;
	return false;
}

/**
 * bsg_request_fn - generic handler for bsg requests
 * @q: request queue to manage
 *
 * On error the create_bsg_job function should return a -Exyz error value
 * that will be set to ->result.
 *
 * Drivers/subsys should pass this to the queue init function.
 */
static void bsg_request_fn(struct request_queue *q)
	__releases(q->queue_lock)
	__acquires(q->queue_lock)
{
	struct device *dev = q->queuedata;
	struct request *req;
	int ret;

	if (!get_device(dev))
		return;

	while (1) {
		req = blk_fetch_request(q);
		if (!req)
			break;
		spin_unlock_irq(q->queue_lock);

		if (!bsg_prepare_job(dev, req)) {
			blk_end_request_all(req, BLK_STS_OK);
			spin_lock_irq(q->queue_lock);
			continue;
		}

		ret = q->bsg_job_fn(blk_mq_rq_to_pdu(req));
		spin_lock_irq(q->queue_lock);
		if (ret)
			break;
	}

	spin_unlock_irq(q->queue_lock);
	put_device(dev);
	spin_lock_irq(q->queue_lock);
}

/* called right after the request is allocated for the request_queue */
static int bsg_init_rq(struct request_queue *q, struct request *req, gfp_t gfp)
{
	struct bsg_job *job = blk_mq_rq_to_pdu(req);

	job->reply = kzalloc(SCSI_SENSE_BUFFERSIZE, gfp);
	if (!job->reply)
		return -ENOMEM;
	return 0;
}

/* called right before the request is given to the request_queue user */
static void bsg_initialize_rq(struct request *req)
{
	struct bsg_job *job = blk_mq_rq_to_pdu(req);
	void *reply = job->reply;

	memset(job, 0, sizeof(*job));
	job->reply = reply;
	job->reply_len = SCSI_SENSE_BUFFERSIZE;
	job->dd_data = job + 1;
}

static void bsg_exit_rq(struct request_queue *q, struct request *req)
{
	struct bsg_job *job = blk_mq_rq_to_pdu(req);

	kfree(job->reply);
}

/**
 * bsg_setup_queue - Create and add the bsg hooks so we can receive requests
 * @dev: device to attach bsg device to
 * @name: device to give bsg device
 * @job_fn: bsg job handler
 * @dd_job_size: size of LLD data needed for each job
 */
struct request_queue *bsg_setup_queue(struct device *dev, const char *name,
		bsg_job_fn *job_fn, int dd_job_size)
{
	struct request_queue *q;
	int ret;

	q = blk_alloc_queue(GFP_KERNEL);
	if (!q)
		return ERR_PTR(-ENOMEM);
	q->cmd_size = sizeof(struct bsg_job) + dd_job_size;
	q->init_rq_fn = bsg_init_rq;
	q->exit_rq_fn = bsg_exit_rq;
	q->initialize_rq_fn = bsg_initialize_rq;
	q->request_fn = bsg_request_fn;

	ret = blk_init_allocated_queue(q);
	if (ret)
		goto out_cleanup_queue;

	q->queuedata = dev;
	q->bsg_job_fn = job_fn;
	blk_queue_flag_set(QUEUE_FLAG_BIDI, q);
	blk_queue_softirq_done(q, bsg_softirq_done);
	blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);

	ret = bsg_register_queue(q, dev, name, &bsg_transport_ops);
	if (ret) {
		printk(KERN_ERR "%s: bsg interface failed to "
		       "initialize - register queue\n", dev->kobj.name);
		goto out_cleanup_queue;
	}

	return q;
out_cleanup_queue:
	blk_cleanup_queue(q);
	return ERR_PTR(ret);
}
EXPORT_SYMBOL_GPL(bsg_setup_queue);
Commit	Line	Data
aa387cc8 MC	1	/*
	2	* BSG helper library
	3	*
	4	* Copyright (C) 2008 James Smart, Emulex Corporation
	5	* Copyright (C) 2011 Red Hat, Inc. All rights reserved.
	6	* Copyright (C) 2011 Mike Christie
	7	*
	8	* This program is free software; you can redistribute it and/or modify
	9	* it under the terms of the GNU General Public License as published by
	10	* the Free Software Foundation; either version 2 of the License, or
	11	* (at your option) any later version.
	12	*
	13	* This program is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	16	* GNU General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU General Public License
	19	* along with this program; if not, write to the Free Software
	20	* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
	21	*
	22	*/
	23	#include <linux/slab.h>
	24	#include <linux/blkdev.h>
	25	#include <linux/delay.h>
	26	#include <linux/scatterlist.h>
	27	#include <linux/bsg-lib.h>
6adb1236	28	#include <linux/export.h>
aa387cc8	29	#include <scsi/scsi_cmnd.h>
17cb960f CH	30	#include <scsi/sg.h>
	31
	32	#define uptr64(val) ((void __user *)(uintptr_t)(val))
	33
	34	static int bsg_transport_check_proto(struct sg_io_v4 *hdr)
	35	{
	36	if (hdr->protocol != BSG_PROTOCOL_SCSI \|\|
	37	hdr->subprotocol != BSG_SUB_PROTOCOL_SCSI_TRANSPORT)
	38	return -EINVAL;
	39	if (!capable(CAP_SYS_RAWIO))
	40	return -EPERM;
	41	return 0;
	42	}
	43
	44	static int bsg_transport_fill_hdr(struct request rq, struct sg_io_v4 hdr,
	45	fmode_t mode)
	46	{
	47	struct bsg_job *job = blk_mq_rq_to_pdu(rq);
	48
	49	job->request_len = hdr->request_len;
	50	job->request = memdup_user(uptr64(hdr->request), hdr->request_len);
47255491	51
47255491	52	return PTR_ERR_OR_ZERO(job->request);
17cb960f CH	53	}
	54
	55	static int bsg_transport_complete_rq(struct request rq, struct sg_io_v4 hdr)
	56	{
	57	struct bsg_job *job = blk_mq_rq_to_pdu(rq);
	58	int ret = 0;
	59
	60	/*
	61	* The assignments below don't make much sense, but are kept for
	62	* bug by bug backwards compatibility:
	63	*/
	64	hdr->device_status = job->result & 0xff;
	65	hdr->transport_status = host_byte(job->result);
	66	hdr->driver_status = driver_byte(job->result);
	67	hdr->info = 0;
	68	if (hdr->device_status \|\| hdr->transport_status \|\| hdr->driver_status)
	69	hdr->info \|= SG_INFO_CHECK;
	70	hdr->response_len = 0;
	71
	72	if (job->result < 0) {
	73	/* we're only returning the result field in the reply */
	74	job->reply_len = sizeof(u32);
	75	ret = job->result;
	76	}
	77
	78	if (job->reply_len && hdr->response) {
	79	int len = min(hdr->max_response_len, job->reply_len);
	80
	81	if (copy_to_user(uptr64(hdr->response), job->reply, len))
	82	ret = -EFAULT;
	83	else
	84	hdr->response_len = len;
	85	}
	86
	87	/* we assume all request payload was transferred, residual == 0 */
	88	hdr->dout_resid = 0;
	89
	90	if (rq->next_rq) {
	91	unsigned int rsp_len = job->reply_payload.payload_len;
	92
	93	if (WARN_ON(job->reply_payload_rcv_len > rsp_len))
	94	hdr->din_resid = 0;
	95	else
	96	hdr->din_resid = rsp_len - job->reply_payload_rcv_len;
	97	} else {
	98	hdr->din_resid = 0;
	99	}
	100
	101	return ret;
	102	}
	103
	104	static void bsg_transport_free_rq(struct request *rq)
	105	{
	106	struct bsg_job *job = blk_mq_rq_to_pdu(rq);
	107
	108	kfree(job->request);
	109	}
	110
	111	static const struct bsg_ops bsg_transport_ops = {
	112	.check_proto = bsg_transport_check_proto,
	113	.fill_hdr = bsg_transport_fill_hdr,
	114	.complete_rq = bsg_transport_complete_rq,
	115	.free_rq = bsg_transport_free_rq,
	116	};
aa387cc8 MC	117
aa387cc8 MC	118	/**
50b4d485	119	* bsg_teardown_job - routine to teardown a bsg job
aa98192d	120	* @kref: kref inside bsg_job that is to be torn down
aa387cc8	121	*/
50b4d485	122	static void bsg_teardown_job(struct kref *kref)
aa387cc8	123	{
bf0f2d38	124	struct bsg_job *job = container_of(kref, struct bsg_job, kref);
ef6fa64f	125	struct request *rq = blk_mq_rq_from_pdu(job);
c00da4c9	126
aa387cc8 MC	127	put_device(job->dev); /* release reference for the request */
	128
	129	kfree(job->request_payload.sg_list);
	130	kfree(job->reply_payload.sg_list);
50b4d485 BB	131
50b4d485 BB	132	blk_end_request_all(rq, BLK_STS_OK);
aa387cc8 MC	133	}
aa387cc8 MC	134
fb6f7c8d JT	135	void bsg_job_put(struct bsg_job *job)
fb6f7c8d JT	136	{
50b4d485	137	kref_put(&job->kref, bsg_teardown_job);
fb6f7c8d JT	138	}
	139	EXPORT_SYMBOL_GPL(bsg_job_put);
	140
	141	int bsg_job_get(struct bsg_job *job)
	142	{
	143	return kref_get_unless_zero(&job->kref);
	144	}
	145	EXPORT_SYMBOL_GPL(bsg_job_get);
aa387cc8 MC	146
	147	/**
	148	* bsg_job_done - completion routine for bsg requests
	149	* @job: bsg_job that is complete
	150	* @result: job reply result
	151	* @reply_payload_rcv_len: length of payload recvd
	152	*
	153	* The LLD should call this when the bsg job has completed.
	154	*/
	155	void bsg_job_done(struct bsg_job *job, int result,
	156	unsigned int reply_payload_rcv_len)
	157	{
17cb960f CH	158	job->result = result;
	159	job->reply_payload_rcv_len = reply_payload_rcv_len;
	160	blk_complete_request(blk_mq_rq_from_pdu(job));
aa387cc8 MC	161	}
	162	EXPORT_SYMBOL_GPL(bsg_job_done);
	163
	164	/**
	165	* bsg_softirq_done - softirq done routine for destroying the bsg requests
	166	* @rq: BSG request that holds the job to be destroyed
	167	*/
	168	static void bsg_softirq_done(struct request *rq)
	169	{
50b4d485	170	struct bsg_job *job = blk_mq_rq_to_pdu(rq);
aa387cc8	171
fb6f7c8d	172	bsg_job_put(job);
aa387cc8 MC	173	}
	174
	175	static int bsg_map_buffer(struct bsg_buffer buf, struct request req)
	176	{
	177	size_t sz = (sizeof(struct scatterlist) * req->nr_phys_segments);
	178
	179	BUG_ON(!req->nr_phys_segments);
	180
	181	buf->sg_list = kzalloc(sz, GFP_KERNEL);
	182	if (!buf->sg_list)
	183	return -ENOMEM;
	184	sg_init_table(buf->sg_list, req->nr_phys_segments);
	185	buf->sg_cnt = blk_rq_map_sg(req->q, req, buf->sg_list);
	186	buf->payload_len = blk_rq_bytes(req);
	187	return 0;
	188	}
	189
	190	/**
50b4d485	191	* bsg_prepare_job - create the bsg_job structure for the bsg request
aa387cc8 MC	192	* @dev: device that is being sent the bsg request
	193	* @req: BSG request that needs a job structure
	194	*/
17cb960f	195	static bool bsg_prepare_job(struct device dev, struct request req)
aa387cc8 MC	196	{
aa387cc8 MC	197	struct request *rsp = req->next_rq;
50b4d485	198	struct bsg_job *job = blk_mq_rq_to_pdu(req);
aa387cc8 MC	199	int ret;
aa387cc8 MC	200
31156ec3	201	job->timeout = req->timeout;
50b4d485	202
aa387cc8 MC	203	if (req->bio) {
	204	ret = bsg_map_buffer(&job->request_payload, req);
	205	if (ret)
	206	goto failjob_rls_job;
	207	}
	208	if (rsp && rsp->bio) {
	209	ret = bsg_map_buffer(&job->reply_payload, rsp);
	210	if (ret)
	211	goto failjob_rls_rqst_payload;
	212	}
	213	job->dev = dev;
	214	/* take a reference for the request */
	215	get_device(job->dev);
bf0f2d38	216	kref_init(&job->kref);
17cb960f	217	return true;
aa387cc8 MC	218
	219	failjob_rls_rqst_payload:
	220	kfree(job->request_payload.sg_list);
	221	failjob_rls_job:
17cb960f CH	222	job->result = -ENOMEM;
17cb960f CH	223	return false;
aa387cc8 MC	224	}
aa387cc8 MC	225
aa387cc8 MC	226	/**
	227	* bsg_request_fn - generic handler for bsg requests
	228	* @q: request queue to manage
	229	*
	230	* On error the create_bsg_job function should return a -Exyz error value
17d5363b	231	* that will be set to ->result.
aa387cc8 MC	232	*
	233	* Drivers/subsys should pass this to the queue init function.
	234	*/
8ae94eb6	235	static void bsg_request_fn(struct request_queue *q)
dbb3ab03 BVA	236	__releases(q->queue_lock)
dbb3ab03 BVA	237	__acquires(q->queue_lock)
aa387cc8 MC	238	{
	239	struct device *dev = q->queuedata;
	240	struct request *req;
aa387cc8 MC	241	int ret;
	242
	243	if (!get_device(dev))
	244	return;
	245
	246	while (1) {
	247	req = blk_fetch_request(q);
	248	if (!req)
	249	break;
	250	spin_unlock_irq(q->queue_lock);
	251
17cb960f	252	if (!bsg_prepare_job(dev, req)) {
2a842aca	253	blk_end_request_all(req, BLK_STS_OK);
aa387cc8 MC	254	spin_lock_irq(q->queue_lock);
	255	continue;
	256	}
	257
50b4d485	258	ret = q->bsg_job_fn(blk_mq_rq_to_pdu(req));
aa387cc8 MC	259	spin_lock_irq(q->queue_lock);
	260	if (ret)
	261	break;
	262	}
	263
	264	spin_unlock_irq(q->queue_lock);
	265	put_device(dev);
	266	spin_lock_irq(q->queue_lock);
	267	}
aa387cc8	268
17cb960f	269	/* called right after the request is allocated for the request_queue */
50b4d485 BB	270	static int bsg_init_rq(struct request_queue q, struct request req, gfp_t gfp)
	271	{
	272	struct bsg_job *job = blk_mq_rq_to_pdu(req);
eab40cf3	273
17cb960f CH	274	job->reply = kzalloc(SCSI_SENSE_BUFFERSIZE, gfp);
17cb960f CH	275	if (!job->reply)
eab40cf3	276	return -ENOMEM;
eab40cf3 BB	277	return 0;
	278	}
	279
17cb960f	280	/* called right before the request is given to the request_queue user */
eab40cf3 BB	281	static void bsg_initialize_rq(struct request *req)
	282	{
	283	struct bsg_job *job = blk_mq_rq_to_pdu(req);
17cb960f	284	void *reply = job->reply;
eab40cf3	285
50b4d485	286	memset(job, 0, sizeof(*job));
17cb960f CH	287	job->reply = reply;
17cb960f CH	288	job->reply_len = SCSI_SENSE_BUFFERSIZE;
50b4d485	289	job->dd_data = job + 1;
50b4d485 BB	290	}
	291
	292	static void bsg_exit_rq(struct request_queue q, struct request req)
	293	{
	294	struct bsg_job *job = blk_mq_rq_to_pdu(req);
50b4d485	295
17cb960f	296	kfree(job->reply);
50b4d485 BB	297	}
50b4d485 BB	298
aa387cc8 MC	299	/**
	300	* bsg_setup_queue - Create and add the bsg hooks so we can receive requests
	301	* @dev: device to attach bsg device to
aa387cc8 MC	302	* @name: device to give bsg device
	303	* @job_fn: bsg job handler
	304	* @dd_job_size: size of LLD data needed for each job
aa387cc8	305	*/
c1225f01	306	struct request_queue bsg_setup_queue(struct device dev, const char *name,
5de815a7	307	bsg_job_fn *job_fn, int dd_job_size)
aa387cc8	308	{
8ae94eb6	309	struct request_queue *q;
aa387cc8 MC	310	int ret;
aa387cc8 MC	311
82ed4db4	312	q = blk_alloc_queue(GFP_KERNEL);
8ae94eb6 CH	313	if (!q)
8ae94eb6 CH	314	return ERR_PTR(-ENOMEM);
50b4d485 BB	315	q->cmd_size = sizeof(struct bsg_job) + dd_job_size;
	316	q->init_rq_fn = bsg_init_rq;
	317	q->exit_rq_fn = bsg_exit_rq;
eab40cf3	318	q->initialize_rq_fn = bsg_initialize_rq;
82ed4db4 CH	319	q->request_fn = bsg_request_fn;
	320
	321	ret = blk_init_allocated_queue(q);
	322	if (ret)
	323	goto out_cleanup_queue;
8ae94eb6	324
aa387cc8	325	q->queuedata = dev;
aa387cc8	326	q->bsg_job_fn = job_fn;
8b904b5b	327	blk_queue_flag_set(QUEUE_FLAG_BIDI, q);
aa387cc8 MC	328	blk_queue_softirq_done(q, bsg_softirq_done);
	329	blk_queue_rq_timeout(q, BLK_DEFAULT_SG_TIMEOUT);
	330
5de815a7	331	ret = bsg_register_queue(q, dev, name, &bsg_transport_ops);
aa387cc8 MC	332	if (ret) {
	333	printk(KERN_ERR "%s: bsg interface failed to "
	334	"initialize - register queue\n", dev->kobj.name);
82ed4db4	335	goto out_cleanup_queue;
aa387cc8 MC	336	}
aa387cc8 MC	337
8ae94eb6	338	return q;
82ed4db4 CH	339	out_cleanup_queue:
	340	blk_cleanup_queue(q);
	341	return ERR_PTR(ret);
aa387cc8 MC	342	}
aa387cc8 MC	343	EXPORT_SYMBOL_GPL(bsg_setup_queue);