Release 4.11 drivers/scsi/hosts.c

/*
 *  hosts.c Copyright (C) 1992 Drew Eckhardt
 *          Copyright (C) 1993, 1994, 1995 Eric Youngdale
 *          Copyright (C) 2002-2003 Christoph Hellwig
 *
 *  mid to lowlevel SCSI driver interface
 *      Initial versions: Drew Eckhardt
 *      Subsequent revisions: Eric Youngdale
 *
 *  <drew@colorado.edu>
 *
 *  Jiffies wrap fixes (host->resetting), 3 Dec 1998 Andrea Arcangeli
 *  Added QLOGIC QLA1280 SCSI controller kernel host support. 
 *     August 4, 1999 Fred Lewis, Intel DuPont
 *
 *  Updated to reflect the new initialization scheme for the higher 
 *  level of scsi drivers (sd/sr/st)
 *  September 17, 2000 Torben Mathiasen <tmm@image.dk>
 *
 *  Restructured scsi_host lists and associated functions.
 *  September 04, 2002 Mike Anderson (andmike@us.ibm.com)
 */

#include <linux/module.h>
#include <linux/blkdev.h>
#include <linux/kernel.h>
#include <linux/slab.h>
#include <linux/kthread.h>
#include <linux/string.h>
#include <linux/mm.h>
#include <linux/init.h>
#include <linux/completion.h>
#include <linux/transport_class.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/idr.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_transport.h>

#include "scsi_priv.h"
#include "scsi_logging.h"


static DEFINE_IDA(host_index_ida);




static void scsi_host_cls_release(struct device *dev)
{
	put_device(&class_to_shost(dev)->shost_gendev);
}

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1
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22
100.00%
2
100.00%


static struct class shost_class = {
	.name		= "scsi_host",
	.dev_release	= scsi_host_cls_release,
};

/**
 *      scsi_host_set_state - Take the given host through the host state model.
 *      @shost: scsi host to change the state of.
 *      @state: state to change to.
 *
 *      Returns zero if unsuccessful or an error if the requested
 *      transition is illegal.
 **/


int scsi_host_set_state(struct Scsi_Host *shost, enum scsi_host_state state)
{
	enum scsi_host_state oldstate = shost->shost_state;

	if (state == oldstate)
		return 0;

	switch (state) {
	case SHOST_CREATED:
		/* There are no legal states that come back to
                 * created.  This is the manually initialised start
                 * state */
		goto illegal;

	case SHOST_RUNNING:
		switch (oldstate) {
		case SHOST_CREATED:
		case SHOST_RECOVERY:
			break;
		default:
			goto illegal;
		}
		break;

	case SHOST_RECOVERY:
		switch (oldstate) {
		case SHOST_RUNNING:
			break;
		default:
			goto illegal;
		}
		break;

	case SHOST_CANCEL:
		switch (oldstate) {
		case SHOST_CREATED:
		case SHOST_RUNNING:
		case SHOST_CANCEL_RECOVERY:
			break;
		default:
			goto illegal;
		}
		break;

	case SHOST_DEL:
		switch (oldstate) {
		case SHOST_CANCEL:
		case SHOST_DEL_RECOVERY:
			break;
		default:
			goto illegal;
		}
		break;

	case SHOST_CANCEL_RECOVERY:
		switch (oldstate) {
		case SHOST_CANCEL:
		case SHOST_RECOVERY:
			break;
		default:
			goto illegal;
		}
		break;

	case SHOST_DEL_RECOVERY:
		switch (oldstate) {
		case SHOST_CANCEL_RECOVERY:
			break;
		default:
			goto illegal;
		}
		break;
	}
	shost->shost_state = state;
	return 0;

 illegal:
	SCSI_LOG_ERROR_RECOVERY(1,
				shost_printk(KERN_ERR, shost,
					     "Illegal host state transition"
					     "%s->%s\n",
					     scsi_host_state_name(oldstate),
					     scsi_host_state_name(state)));
	return -EINVAL;
}
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Mike Anderson
161
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33.33%
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46
22.22%
2
66.67%
Total
207
100.00%
3
100.00%


EXPORT_SYMBOL(scsi_host_set_state);

/**
 * scsi_remove_host - remove a scsi host
 * @shost:      a pointer to a scsi host to remove
 **/


void scsi_remove_host(struct Scsi_Host *shost)
{
	unsigned long flags;

	mutex_lock(&shost->scan_mutex);
	spin_lock_irqsave(shost->host_lock, flags);
	if (scsi_host_set_state(shost, SHOST_CANCEL))
		if (scsi_host_set_state(shost, SHOST_CANCEL_RECOVERY)) {
			spin_unlock_irqrestore(shost->host_lock, flags);
			mutex_unlock(&shost->scan_mutex);
			return;
		}
	spin_unlock_irqrestore(shost->host_lock, flags);

	scsi_autopm_get_host(shost);
	flush_workqueue(shost->tmf_work_q);
	scsi_forget_host(shost);
	mutex_unlock(&shost->scan_mutex);
	scsi_proc_host_rm(shost);

	spin_lock_irqsave(shost->host_lock, flags);
	if (scsi_host_set_state(shost, SHOST_DEL))
		BUG_ON(scsi_host_set_state(shost, SHOST_DEL_RECOVERY));
	spin_unlock_irqrestore(shost->host_lock, flags);

	transport_unregister_device(&shost->shost_gendev);
	device_unregister(&shost->shost_dev);
	device_del(&shost->shost_gendev);
}
Contributors
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James Bottomley
92
54.44%
4
19.05%
Mike Anderson
30
17.75%
7
33.33%
Christoph Hellwig
24
14.20%
3
14.29%
Hannes Reinecke
7
4.14%
1
4.76%
Alexey Kuznetsov
5
2.96%
1
4.76%
Alan Stern
5
2.96%
1
4.76%
Tony Jones
2
1.18%
1
4.76%
Arjan van de Ven
2
1.18%
1
4.76%
Linus Torvalds (pre-git)
1
0.59%
1
4.76%
Doug Ledford
1
0.59%
1
4.76%
Total
169
100.00%
21
100.00%


EXPORT_SYMBOL(scsi_remove_host);

/**
 * scsi_add_host_with_dma - add a scsi host with dma device
 * @shost:      scsi host pointer to add
 * @dev:        a struct device of type scsi class
 * @dma_dev:    dma device for the host
 *
 * Note: You rarely need to worry about this unless you're in a
 * virtualised host environments, so use the simpler scsi_add_host()
 * function instead.
 *
 * Return value: 
 *      0 on success / != 0 for error
 **/


int scsi_add_host_with_dma(struct Scsi_Host *shost, struct device *dev,
			   struct device *dma_dev)
{
	struct scsi_host_template *sht = shost->hostt;
	int error = -EINVAL;

	shost_printk(KERN_INFO, shost, "%s\n",
			sht->info ? sht->info(shost) : sht->name);

	if (!shost->can_queue) {
		shost_printk(KERN_ERR, shost,
			     "can_queue = 0 no longer supported\n");
		goto fail;
	}

	error = scsi_init_sense_cache(shost);
	if (error)
		goto fail;

	if (shost_use_blk_mq(shost)) {
		error = scsi_mq_setup_tags(shost);
		if (error)
			goto fail;
	} else {
		shost->bqt = blk_init_tags(shost->can_queue,
				shost->hostt->tag_alloc_policy);
		if (!shost->bqt) {
			error = -ENOMEM;
			goto fail;
		}
	}

	if (!shost->shost_gendev.parent)
		shost->shost_gendev.parent = dev ? dev : &platform_bus;
	if (!dma_dev)
		dma_dev = shost->shost_gendev.parent;

	shost->dma_dev = dma_dev;

	/*
         * Increase usage count temporarily here so that calling
         * scsi_autopm_put_host() will trigger runtime idle if there is
         * nothing else preventing suspending the device.
         */
	pm_runtime_get_noresume(&shost->shost_gendev);
	pm_runtime_set_active(&shost->shost_gendev);
	pm_runtime_enable(&shost->shost_gendev);
	device_enable_async_suspend(&shost->shost_gendev);

	error = device_add(&shost->shost_gendev);
	if (error)
		goto out_disable_runtime_pm;

	scsi_host_set_state(shost, SHOST_RUNNING);
	get_device(shost->shost_gendev.parent);

	device_enable_async_suspend(&shost->shost_dev);

	error = device_add(&shost->shost_dev);
	if (error)
		goto out_del_gendev;

	get_device(&shost->shost_gendev);

	if (shost->transportt->host_size) {
		shost->shost_data = kzalloc(shost->transportt->host_size,
					 GFP_KERNEL);
		if (shost->shost_data == NULL) {
			error = -ENOMEM;
			goto out_del_dev;
		}
	}

	if (shost->transportt->create_work_queue) {
		snprintf(shost->work_q_name, sizeof(shost->work_q_name),
			 "scsi_wq_%d", shost->host_no);
		shost->work_q = create_singlethread_workqueue(
					shost->work_q_name);
		if (!shost->work_q) {
			error = -EINVAL;
			goto out_free_shost_data;
		}
	}

	error = scsi_sysfs_add_host(shost);
	if (error)
		goto out_destroy_host;

	scsi_proc_host_add(shost);
	scsi_autopm_put_host(shost);
	return error;

 out_destroy_host:
	if (shost->work_q)
		destroy_workqueue(shost->work_q);
 out_free_shost_data:
	kfree(shost->shost_data);
 out_del_dev:
	device_del(&shost->shost_dev);
 out_del_gendev:
	device_del(&shost->shost_gendev);
 out_disable_runtime_pm:
	device_disable_async_suspend(&shost->shost_gendev);
	pm_runtime_disable(&shost->shost_gendev);
	pm_runtime_set_suspended(&shost->shost_gendev);
	pm_runtime_put_noidle(&shost->shost_gendev);
	if (shost_use_blk_mq(shost))
		scsi_mq_destroy_tags(shost);
 fail:
	return error;
}
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Christoph Hellwig
208
40.23%
10
30.30%
James Smart
90
17.41%
2
6.06%
James Bottomley
88
17.02%
7
21.21%
Heiner Kallweit
46
8.90%
1
3.03%
Mike Anderson
21
4.06%
4
12.12%
Alan Stern
21
4.06%
1
3.03%
Mika Westerberg
12
2.32%
1
3.03%
Rafael J. Wysocki
8
1.55%
1
3.03%
Hannes Reinecke
7
1.35%
1
3.03%
Tony Jones
6
1.16%
1
3.03%
Kay Sievers
6
1.16%
1
3.03%
Linus Torvalds (pre-git)
2
0.39%
1
3.03%
Andrew Morton
1
0.19%
1
3.03%
FUJITA Tomonori
1
0.19%
1
3.03%
Total
517
100.00%
33
100.00%


EXPORT_SYMBOL(scsi_add_host_with_dma);



static void scsi_host_dev_release(struct device *dev)
{
	struct Scsi_Host *shost = dev_to_shost(dev);
	struct device *parent = dev->parent;
	struct request_queue *q;
	void *queuedata;

	scsi_proc_hostdir_rm(shost->hostt);

	if (shost->tmf_work_q)
		destroy_workqueue(shost->tmf_work_q);
	if (shost->ehandler)
		kthread_stop(shost->ehandler);
	if (shost->work_q)
		destroy_workqueue(shost->work_q);
	q = shost->uspace_req_q;
	if (q) {
		queuedata = q->queuedata;
		blk_cleanup_queue(q);
		kfree(queuedata);
	}

	if (shost->shost_state == SHOST_CREATED) {
		/*
                 * Free the shost_dev device name here if scsi_host_alloc()
                 * and scsi_host_put() have been called but neither
                 * scsi_host_add() nor scsi_host_remove() has been called.
                 * This avoids that the memory allocated for the shost_dev
                 * name is leaked.
                 */
		kfree(dev_name(&shost->shost_dev));
	}

	if (shost_use_blk_mq(shost)) {
		if (shost->tag_set.tags)
			scsi_mq_destroy_tags(shost);
	} else {
		if (shost->bqt)
			blk_free_tags(shost->bqt);
	}

	kfree(shost->shost_data);

	ida_simple_remove(&host_index_ida, shost->host_no);

	if (parent)
		put_device(parent);
	kfree(shost);
}

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Christoph Hellwig
55
26.96%
3
16.67%
Bart Van Assche
49
24.02%
3
16.67%
Mike Anderson
20
9.80%
2
11.11%
James Bottomley
20
9.80%
2
11.11%
James Smart
13
6.37%
1
5.56%
Hannes Reinecke
13
6.37%
1
5.56%
Lee Duncan
10
4.90%
1
5.56%
FUJITA Tomonori
10
4.90%
1
5.56%
Alan Stern
7
3.43%
1
5.56%
Andrew Morton
4
1.96%
1
5.56%
Linus Torvalds (pre-git)
3
1.47%
2
11.11%
Total
204
100.00%
18
100.00%


static int shost_eh_deadline = -1;

module_param_named(eh_deadline, shost_eh_deadline, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(eh_deadline,
		 "SCSI EH timeout in seconds (should be between 0 and 2^31-1)");


static struct device_type scsi_host_type = {
	.name =		"scsi_host",
	.release =	scsi_host_dev_release,
};

/**
 * scsi_host_alloc - register a scsi host adapter instance.
 * @sht:        pointer to scsi host template
 * @privsize:   extra bytes to allocate for driver
 *
 * Note:
 *      Allocate a new Scsi_Host and perform basic initialization.
 *      The host is not published to the scsi midlayer until scsi_add_host
 *      is called.
 *
 * Return value:
 *      Pointer to a new Scsi_Host
 **/


struct Scsi_Host *scsi_host_alloc(struct scsi_host_template *sht, int privsize)
{
	struct Scsi_Host *shost;
	gfp_t gfp_mask = GFP_KERNEL;
	int index;

	if (sht->unchecked_isa_dma && privsize)
		gfp_mask |= __GFP_DMA;

	shost = kzalloc(sizeof(struct Scsi_Host) + privsize, gfp_mask);
	if (!shost)
		return NULL;

	shost->host_lock = &shost->default_lock;
	spin_lock_init(shost->host_lock);
	shost->shost_state = SHOST_CREATED;
	INIT_LIST_HEAD(&shost->__devices);
	INIT_LIST_HEAD(&shost->__targets);
	INIT_LIST_HEAD(&shost->eh_cmd_q);
	INIT_LIST_HEAD(&shost->starved_list);
	init_waitqueue_head(&shost->host_wait);
	mutex_init(&shost->scan_mutex);

	index = ida_simple_get(&host_index_ida, 0, 0, GFP_KERNEL);
	if (index < 0)
		goto fail_kfree;
	shost->host_no = index;

	shost->dma_channel = 0xff;

	/* These three are default values which can be overridden */
	shost->max_channel = 0;
	shost->max_id = 8;
	shost->max_lun = 8;

	/* Give each shost a default transportt */
	shost->transportt = &blank_transport_template;

	/*
         * All drivers right now should be able to handle 12 byte
         * commands.  Every so often there are requests for 16 byte
         * commands, but individual low-level drivers need to certify that
         * they actually do something sensible with such commands.
         */
	shost->max_cmd_len = 12;
	shost->hostt = sht;
	shost->this_id = sht->this_id;
	shost->can_queue = sht->can_queue;
	shost->sg_tablesize = sht->sg_tablesize;
	shost->sg_prot_tablesize = sht->sg_prot_tablesize;
	shost->cmd_per_lun = sht->cmd_per_lun;
	shost->unchecked_isa_dma = sht->unchecked_isa_dma;
	shost->use_clustering = sht->use_clustering;
	shost->no_write_same = sht->no_write_same;

	if (shost_eh_deadline == -1 || !sht->eh_host_reset_handler)
		shost->eh_deadline = -1;
	else if ((ulong) shost_eh_deadline * HZ > INT_MAX) {
		shost_printk(KERN_WARNING, shost,
			     "eh_deadline %u too large, setting to %u\n",
			     shost_eh_deadline, INT_MAX / HZ);
		shost->eh_deadline = INT_MAX;
	} else
		shost->eh_deadline = shost_eh_deadline * HZ;

	if (sht->supported_mode == MODE_UNKNOWN)
		/* means we didn't set it ... default to INITIATOR */
		shost->active_mode = MODE_INITIATOR;
	else
		shost->active_mode = sht->supported_mode;

	if (sht->max_host_blocked)
		shost->max_host_blocked = sht->max_host_blocked;
	else
		shost->max_host_blocked = SCSI_DEFAULT_HOST_BLOCKED;

	/*
         * If the driver imposes no hard sector transfer limit, start at
         * machine infinity initially.
         */
	if (sht->max_sectors)
		shost->max_sectors = sht->max_sectors;
	else
		shost->max_sectors = SCSI_DEFAULT_MAX_SECTORS;

	/*
         * assume a 4GB boundary, if not set
         */
	if (sht->dma_boundary)
		shost->dma_boundary = sht->dma_boundary;
	else
		shost->dma_boundary = 0xffffffff;

	shost->use_blk_mq = scsi_use_blk_mq;

	device_initialize(&shost->shost_gendev);
	dev_set_name(&shost->shost_gendev, "host%d", shost->host_no);
	shost->shost_gendev.bus = &scsi_bus_type;
	shost->shost_gendev.type = &scsi_host_type;

	device_initialize(&shost->shost_dev);
	shost->shost_dev.parent = &shost->shost_gendev;
	shost->shost_dev.class = &shost_class;
	dev_set_name(&shost->shost_dev, "host%d", shost->host_no);
	shost->shost_dev.groups = scsi_sysfs_shost_attr_groups;

	shost->ehandler = kthread_run(scsi_error_handler, shost,
			"scsi_eh_%d", shost->host_no);
	if (IS_ERR(shost->ehandler)) {
		shost_printk(KERN_WARNING, shost,
			"error handler thread failed to spawn, error = %ld\n",
			PTR_ERR(shost->ehandler));
		goto fail_index_remove;
	}

	shost->tmf_work_q = alloc_workqueue("scsi_tmf_%d",
					    WQ_UNBOUND | WQ_MEM_RECLAIM,
					   1, shost->host_no);
	if (!shost->tmf_work_q) {
		shost_printk(KERN_WARNING, shost,
			     "failed to create tmf workq\n");
		goto fail_kthread;
	}
	scsi_proc_hostdir_add(shost->hostt);
	return shost;

 fail_kthread:
	kthread_stop(shost->ehandler);
 fail_index_remove:
	ida_simple_remove(&host_index_ida, shost->host_no);
 fail_kfree:
	kfree(shost);
	return NULL;
}
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Mike Anderson
184
28.40%
6
13.95%
Christoph Hellwig
160
24.69%
9
20.93%
Hannes Reinecke
83
12.81%
7
16.28%
James Bottomley
62
9.57%
5
11.63%
Ren Mingxin
53
8.18%
1
2.33%
Lee Duncan
40
6.17%
1
2.33%
Martin K. Petersen
13
2.01%
2
4.65%
Patrick Mansfield
8
1.23%
1
2.33%
Anton Blanchard
7
1.08%
1
2.33%
Doug Ledford
7
1.08%
1
2.33%
Bart Van Assche
6
0.93%
1
2.33%
Justin P. Mattock
6
0.93%
1
2.33%
Tony Jones
6
0.93%
1
2.33%
Kay Sievers
4
0.62%
1
2.33%
Joe Eykholt
3
0.46%
1
2.33%
Al Viro
2
0.31%
1
2.33%
Jens Axboe
2
0.31%
1
2.33%
Jes Sorensen
1
0.15%
1
2.33%
Arjan van de Ven
1
0.15%
1
2.33%
Total
648
100.00%
43
100.00%


EXPORT_SYMBOL(scsi_host_alloc);



struct Scsi_Host *scsi_register(struct scsi_host_template *sht, int privsize)
{
	struct Scsi_Host *shost = scsi_host_alloc(sht, privsize);

	if (!sht->detect) {
		printk(KERN_WARNING "scsi_register() called on new-style "
				    "template for driver %s\n", sht->name);
		dump_stack();
	}

	if (shost)
		list_add_tail(&shost->sht_legacy_list, &sht->legacy_hosts);
	return shost;
}
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Christoph Hellwig
54
77.14%
6
85.71%
Mike Anderson
16
22.86%
1
14.29%
Total
70
100.00%
7
100.00%


EXPORT_SYMBOL(scsi_register);



void scsi_unregister(struct Scsi_Host *shost)
{
	list_del(&shost->sht_legacy_list);
	scsi_host_put(shost);
}
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Christoph Hellwig
15
65.22%
1
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Mike Anderson
8
34.78%
1
50.00%
Total
23
100.00%
2
100.00%


EXPORT_SYMBOL(scsi_unregister);



static int __scsi_host_match(struct device *dev, const void *data)
{
	struct Scsi_Host *p;
	const unsigned short *hostnum = data;

	p = class_to_shost(dev);
	return p->host_no == *hostnum;
}

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Dave Young
39
88.64%
1
33.33%
Tony Jones
3
6.82%
1
33.33%
Michał Mirosław
2
4.55%
1
33.33%
Total
44
100.00%
3
100.00%

/**
 * scsi_host_lookup - get a reference to a Scsi_Host by host no
 * @hostnum:    host number to locate
 *
 * Return value:
 *      A pointer to located Scsi_Host or NULL.
 *
 *      The caller must do a scsi_host_put() to drop the reference
 *      that scsi_host_get() took. The put_device() below dropped
 *      the reference from class_find_device().
 **/


struct Scsi_Host *scsi_host_lookup(unsigned short hostnum)
{
	struct device *cdev;
	struct Scsi_Host *shost = NULL;

	cdev = class_find_device(&shost_class, NULL, &hostnum,
				 __scsi_host_match);
	if (cdev) {
		shost = scsi_host_get(class_to_shost(cdev));
		put_device(cdev);
	}
	return shost;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
28
45.16%
1
11.11%
Mike Anderson
11
17.74%
2
22.22%
Dave Young
10
16.13%
1
11.11%
Mike Christie
7
11.29%
1
11.11%
Tony Jones
2
3.23%
1
11.11%
Greg Kroah-Hartman
2
3.23%
1
11.11%
Linus Torvalds (pre-git)
1
1.61%
1
11.11%
James Smart
1
1.61%
1
11.11%
Total
62
100.00%
9
100.00%


EXPORT_SYMBOL(scsi_host_lookup);

/**
 * scsi_host_get - inc a Scsi_Host ref count
 * @shost:      Pointer to Scsi_Host to inc.
 **/


struct Scsi_Host *scsi_host_get(struct Scsi_Host *shost)
{
	if ((shost->shost_state == SHOST_DEL) ||
		!get_device(&shost->shost_gendev))
		return NULL;
	return shost;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Mike Anderson
37
100.00%
3
100.00%
Total
37
100.00%
3
100.00%


EXPORT_SYMBOL(scsi_host_get);

/**
 * scsi_host_put - dec a Scsi_Host ref count
 * @shost:      Pointer to Scsi_Host to dec.
 **/


void scsi_host_put(struct Scsi_Host *shost)
{
	put_device(&shost->shost_gendev);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Mike Anderson
15
83.33%
2
40.00%
James Bottomley
1
5.56%
1
20.00%
Linus Torvalds (pre-git)
1
5.56%
1
20.00%
Christoph Hellwig
1
5.56%
1
20.00%
Total
18
100.00%
5
100.00%


EXPORT_SYMBOL(scsi_host_put);



int scsi_init_hosts(void)
{
	return class_register(&shost_class);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
14
100.00%
1
100.00%
Total
14
100.00%
1
100.00%



void scsi_exit_hosts(void)
{
	class_unregister(&shost_class);
	ida_destroy(&host_index_ida);
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
13
68.42%
1
50.00%
Lee Duncan
6
31.58%
1
50.00%
Total
19
100.00%
2
100.00%



int scsi_is_host_device(const struct device *dev)
{
	return dev->type == &scsi_host_type;
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
James Bottomley
16
84.21%
1
50.00%
Hannes Reinecke
3
15.79%
1
50.00%
Total
19
100.00%
2
100.00%


EXPORT_SYMBOL(scsi_is_host_device);

/**
 * scsi_queue_work - Queue work to the Scsi_Host workqueue.
 * @shost:      Pointer to Scsi_Host.
 * @work:       Work to queue for execution.
 *
 * Return value:
 *      1 - work queued for execution
 *      0 - work is already queued
 *      -EINVAL - work queue doesn't exist
 **/


int scsi_queue_work(struct Scsi_Host *shost, struct work_struct *work)
{
	if (unlikely(!shost->work_q)) {
		shost_printk(KERN_ERR, shost,
			"ERROR: Scsi host '%s' attempted to queue scsi-work, "
			"when no workqueue created.\n", shost->hostt->name);
		dump_stack();

		return -EINVAL;
	}

	return queue_work(shost->work_q, work);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
James Smart
56
93.33%
1
50.00%
Hannes Reinecke
4
6.67%
1
50.00%
Total
60
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(scsi_queue_work);

/**
 * scsi_flush_work - Flush a Scsi_Host's workqueue.
 * @shost:      Pointer to Scsi_Host.
 **/


void scsi_flush_work(struct Scsi_Host *shost)
{
	if (!shost->work_q) {
		shost_printk(KERN_ERR, shost,
			"ERROR: Scsi host '%s' attempted to flush scsi-work, "
			"when no workqueue created.\n", shost->hostt->name);
		dump_stack();
		return;
	}

	flush_workqueue(shost->work_q);
}
Contributors
Person
Tokens
Prop
Commits
CommitProp
Mike Christie
42
91.30%
1
50.00%
Hannes Reinecke
4
8.70%
1
50.00%
Total
46
100.00%
2
100.00%


EXPORT_SYMBOL_GPL(scsi_flush_work);
Overall Contributors
Person
Tokens
Prop
Commits
CommitProp
Christoph Hellwig
619
26.12%
25
20.49%
Mike Anderson
512
21.60%
11
9.02%
James Bottomley
339
14.30%
19
15.57%
James Smart
165
6.96%
3
2.46%
Hannes Reinecke
159
6.71%
7
5.74%
Lee Duncan
62
2.62%
1
0.82%
Ren Mingxin
58
2.45%
1
0.82%
Mike Christie
56
2.36%
2
1.64%
Bart Van Assche
55
2.32%
4
3.28%
Dave Young
49
2.07%
1
0.82%
Heiner Kallweit
46
1.94%
1
0.82%
Adrian Bunk
40
1.69%
2
1.64%
Alan Stern
36
1.52%
2
1.64%
Linus Torvalds (pre-git)
29
1.22%
12
9.84%
Tony Jones
23
0.97%
1
0.82%
Martin K. Petersen
13
0.55%
2
1.64%
Mika Westerberg
12
0.51%
1
0.82%
FUJITA Tomonori
11
0.46%
2
1.64%
Kay Sievers
10
0.42%
2
1.64%
Rafael J. Wysocki
8
0.34%
1
0.82%
Doug Ledford
8
0.34%
2
1.64%
Patrick Mansfield
8
0.34%
1
0.82%
Anton Blanchard
7
0.30%
1
0.82%
Andrew Morton
7
0.30%
3
2.46%
Justin P. Mattock
6
0.25%
1
0.82%
Alexey Kuznetsov
5
0.21%
1
0.82%
Arjan van de Ven
3
0.13%
1
0.82%
Joe Eykholt
3
0.13%
1
0.82%
Tejun Heo
3
0.13%
1
0.82%
Russell King
3
0.13%
1
0.82%
Joshua Hunt
2
0.08%
1
0.82%
Al Viro
2
0.08%
1
0.82%
Jens Axboe
2
0.08%
1
0.82%
Geert Uytterhoeven
2
0.08%
1
0.82%
Michał Mirosław
2
0.08%
1
0.82%
Greg Kroah-Hartman
2
0.08%
1
0.82%
Rob Landley
1
0.04%
1
0.82%
Jes Sorensen
1
0.04%
1
0.82%
Michael Reed
1
0.04%
1
0.82%
Total
2370
100.00%
122
100.00%
Directory: drivers/scsi

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