[PATCH 6/8] scsi_dh: kill struct scsi_dh_data

Christoph Hellwig
2015-05-10T18:42:35Z

Add a ->handler and a ->handler_data field to struct scsi_device and kill
this indirection. Also move struct scsi_device_handler to scsi_dh.h so that
changes to it don't require rebuilding every SCSI LLDD.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Martin K. Petersen <martin.petersen@oracle.com>
Reviewed-by: Hannes Reinecke <hare@suse.de>
---
drivers/scsi/device_handler/scsi_dh_alua.c | 24 ++++------
drivers/scsi/device_handler/scsi_dh_emc.c | 28 ++++-------
drivers/scsi/device_handler/scsi_dh_hp_sw.c | 24 ++++------
drivers/scsi/device_handler/scsi_dh_rdac.c | 29 +++++-------
drivers/scsi/scsi_dh.c | 72 +++++++++++------------------
drivers/scsi/scsi_error.c | 6 +--
drivers/scsi/scsi_lib.c | 6 +--
include/scsi/scsi_device.h | 25 ++--------
include/scsi/scsi_dh.h | 17 +++++++
9 files changed, 92 insertions(+), 139 deletions(-)

diff --git a/drivers/scsi/device_handler/scsi_dh_alua.c b/drivers/scsi/device_handler/scsi_dh_alua.c
index ace2457..e418849 100644
--- a/drivers/scsi/device_handler/scsi_dh_alua.c
+++ b/drivers/scsi/device_handler/scsi_dh_alua.c
@@ -62,7 +62,6 @@
#define ALUA_OPTIMIZE_STPG 1

struct alua_dh_data {
- struct scsi_dh_data dh_data;
int group_id;
int rel_port;
int tpgs;
@@ -86,11 +85,6 @@ struct alua_dh_data {
static char print_alua_state(int);
static int alua_check_sense(struct scsi_device *, struct scsi_sense_hdr *);

-static inline struct alua_dh_data *get_alua_data(struct scsi_device *sdev)
-{
- return container_of(sdev->scsi_dh_data, struct alua_dh_data, dh_data);
-}
-
static int realloc_buffer(struct alua_dh_data *h, unsigned len)
{
if (h->buff && h->buff != h->inq)
@@ -708,7 +702,7 @@ out:
*/
static int alua_set_params(struct scsi_device *sdev, const char *params)
{
- struct alua_dh_data *h = get_alua_data(sdev);
+ struct alua_dh_data *h = sdev->handler_data;
unsigned int optimize = 0, argc;
const char *p = params;
int result = SCSI_DH_OK;
@@ -746,7 +740,7 @@ MODULE_PARM_DESC(optimize_stpg, "Allow use of a non-optimized path, rather than
static int alua_activate(struct scsi_device *sdev,
activate_complete fn, void *data)
{
- struct alua_dh_data *h = get_alua_data(sdev);
+ struct alua_dh_data *h = sdev->handler_data;
int err = SCSI_DH_OK;
int stpg = 0;

@@ -804,7 +798,7 @@ out:
*/
static int alua_prep_fn(struct scsi_device *sdev, struct request *req)
{
- struct alua_dh_data *h = get_alua_data(sdev);
+ struct alua_dh_data *h = sdev->handler_data;
int ret = BLKPREP_OK;

if (h->state == TPGS_STATE_TRANSITIONING)
@@ -823,14 +817,14 @@ static int alua_prep_fn(struct scsi_device *sdev, struct request *req)
* alua_bus_attach - Attach device handler
* @sdev: device to be attached to
*/
-static struct scsi_dh_data *alua_bus_attach(struct scsi_device *sdev)
+static int alua_bus_attach(struct scsi_device *sdev)
{
struct alua_dh_data *h;
int err;

h = kzalloc(sizeof(*h) , GFP_KERNEL);
if (!h)
- return ERR_PTR(-ENOMEM);
+ return -ENOMEM;
h->tpgs = TPGS_MODE_UNINITIALIZED;
h->state = TPGS_STATE_OPTIMIZED;
h->group_id = -1;
@@ -843,11 +837,11 @@ static struct scsi_dh_data *alua_bus_attach(struct scsi_device *sdev)
if (err != SCSI_DH_OK && err != SCSI_DH_DEV_OFFLINED)
goto failed;

- sdev_printk(KERN_NOTICE, sdev, "%s: Attached\n", ALUA_DH_NAME);
- return &h->dh_data;
+ sdev->handler_data = h;
+ return 0;
failed:
kfree(h);
- return ERR_PTR(-EINVAL);
+ return -EINVAL;
}

/*
@@ -856,7 +850,7 @@ failed:
*/
static void alua_bus_detach(struct scsi_device *sdev)
{
- struct alua_dh_data *h = get_alua_data(sdev);
+ struct alua_dh_data *h = sdev->handler_data;

if (h->buff && h->inq != h->buff)
kfree(h->buff);
diff --git a/drivers/scsi/device_handler/scsi_dh_emc.c b/drivers/scsi/device_handler/scsi_dh_emc.c
index fd31e67..4b75b50 100644
--- a/drivers/scsi/device_handler/scsi_dh_emc.c
+++ b/drivers/scsi/device_handler/scsi_dh_emc.c
@@ -72,7 +72,6 @@ static const char * lun_state[] =
};

struct clariion_dh_data {
- struct scsi_dh_data dh_data;
/*
* Flags:
* CLARIION_SHORT_TRESPASS
@@ -114,13 +113,6 @@ struct clariion_dh_data {
int current_sp;
};

-static inline struct clariion_dh_data
- *get_clariion_data(struct scsi_device *sdev)
-{
- return container_of(sdev->scsi_dh_data, struct clariion_dh_data,
- dh_data);
-}
-
/*
* Parse MODE_SELECT cmd reply.
*/
@@ -450,7 +442,7 @@ static int clariion_check_sense(struct scsi_device *sdev,

static int clariion_prep_fn(struct scsi_device *sdev, struct request *req)
{
- struct clariion_dh_data *h = get_clariion_data(sdev);
+ struct clariion_dh_data *h = sdev->handler_data;
int ret = BLKPREP_OK;

if (h->lun_state != CLARIION_LUN_OWNED) {
@@ -533,7 +525,7 @@ retry:
static int clariion_activate(struct scsi_device *sdev,
activate_complete fn, void *data)
{
- struct clariion_dh_data *csdev = get_clariion_data(sdev);
+ struct clariion_dh_data *csdev = sdev->handler_data;
int result;

result = clariion_send_inquiry(sdev, csdev);
@@ -574,7 +566,7 @@ done:
*/
static int clariion_set_params(struct scsi_device *sdev, const char *params)
{
- struct clariion_dh_data *csdev = get_clariion_data(sdev);
+ struct clariion_dh_data *csdev = sdev->handler_data;
unsigned int hr = 0, st = 0, argc;
const char *p = params;
int result = SCSI_DH_OK;
@@ -622,14 +614,14 @@ done:
return result;
}

-static struct scsi_dh_data *clariion_bus_attach(struct scsi_device *sdev)
+static int clariion_bus_attach(struct scsi_device *sdev)
{
struct clariion_dh_data *h;
int err;

h = kzalloc(sizeof(*h) , GFP_KERNEL);
if (!h)
- return ERR_PTR(-ENOMEM);
+ return -ENOMEM;
h->lun_state = CLARIION_LUN_UNINITIALIZED;
h->default_sp = CLARIION_UNBOUND_LU;
h->current_sp = CLARIION_UNBOUND_LU;
@@ -647,18 +639,18 @@ static struct scsi_dh_data *clariion_bus_attach(struct scsi_device *sdev)
CLARIION_NAME, h->current_sp + 'A',
h->port, lun_state[h->lun_state],
h->default_sp + 'A');
- return &h->dh_data;
+
+ sdev->handler_data = h;
+ return 0;

failed:
kfree(h);
- return ERR_PTR(-EINVAL);
+ return -EINVAL;
}

static void clariion_bus_detach(struct scsi_device *sdev)
{
- struct clariion_dh_data *h = get_clariion_data(sdev);
-
- kfree(h);
+ kfree(sdev->handler_data);
}

static struct scsi_device_handler clariion_dh = {
diff --git a/drivers/scsi/device_handler/scsi_dh_hp_sw.c b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
index 1bf10d3..d5390ba 100644
--- a/drivers/scsi/device_handler/scsi_dh_hp_sw.c
+++ b/drivers/scsi/device_handler/scsi_dh_hp_sw.c
@@ -38,7 +38,6 @@
#define HP_SW_PATH_PASSIVE 1

struct hp_sw_dh_data {
- struct scsi_dh_data dh_data;
unsigned char sense[SCSI_SENSE_BUFFERSIZE];
int path_state;
int retries;
@@ -50,11 +49,6 @@ struct hp_sw_dh_data {

static int hp_sw_start_stop(struct hp_sw_dh_data *);

-static inline struct hp_sw_dh_data *get_hp_sw_data(struct scsi_device *sdev)
-{
- return container_of(sdev->scsi_dh_data, struct hp_sw_dh_data, dh_data);
-}
-
/*
* tur_done - Handle TEST UNIT READY return status
* @sdev: sdev the command has been sent to
@@ -267,7 +261,7 @@ static int hp_sw_start_stop(struct hp_sw_dh_data *h)

static int hp_sw_prep_fn(struct scsi_device *sdev, struct request *req)
{
- struct hp_sw_dh_data *h = get_hp_sw_data(sdev);
+ struct hp_sw_dh_data *h = sdev->handler_data;
int ret = BLKPREP_OK;

if (h->path_state != HP_SW_PATH_ACTIVE) {
@@ -292,7 +286,7 @@ static int hp_sw_activate(struct scsi_device *sdev,
activate_complete fn, void *data)
{
int ret = SCSI_DH_OK;
- struct hp_sw_dh_data *h = get_hp_sw_data(sdev);
+ struct hp_sw_dh_data *h = sdev->handler_data;

ret = hp_sw_tur(sdev, h);

@@ -311,14 +305,14 @@ static int hp_sw_activate(struct scsi_device *sdev,
return 0;
}

-static struct scsi_dh_data *hp_sw_bus_attach(struct scsi_device *sdev)
+static int hp_sw_bus_attach(struct scsi_device *sdev)
{
struct hp_sw_dh_data *h;
int ret;

h = kzalloc(sizeof(*h), GFP_KERNEL);
if (!h)
- return ERR_PTR(-ENOMEM);
+ return -ENOMEM;
h->path_state = HP_SW_PATH_UNINITIALIZED;
h->retries = HP_SW_RETRIES;
h->sdev = sdev;
@@ -330,17 +324,17 @@ static struct scsi_dh_data *hp_sw_bus_attach(struct scsi_device *sdev)
sdev_printk(KERN_INFO, sdev, "%s: attached to %s path\n",
HP_SW_NAME, h->path_state == HP_SW_PATH_ACTIVE?
"active":"passive");
- return &h->dh_data;
+
+ sdev->handler_data = h;
+ return 0;
failed:
kfree(h);
- return ERR_PTR(-EINVAL);
+ return -EINVAL;
}

static void hp_sw_bus_detach( struct scsi_device *sdev )
{
- struct hp_sw_dh_data *h = get_hp_sw_data(sdev);
-
- kfree(h);
+ kfree(sdev->handler_data);
}

static struct scsi_device_handler hp_sw_dh = {
diff --git a/drivers/scsi/device_handler/scsi_dh_rdac.c b/drivers/scsi/device_handler/scsi_dh_rdac.c
index d89616f..0c6d612 100644
--- a/drivers/scsi/device_handler/scsi_dh_rdac.c
+++ b/drivers/scsi/device_handler/scsi_dh_rdac.c
@@ -181,7 +181,6 @@ struct c2_inquiry {
};

struct rdac_dh_data {
- struct scsi_dh_data dh_data;
struct rdac_controller *ctlr;
#define UNINITIALIZED_LUN (1 << 8)
unsigned lun;
@@ -260,11 +259,6 @@ do { \
sdev_printk(KERN_INFO, sdev, RDAC_NAME ": " f "\n", ## arg); \
} while (0);

-static inline struct rdac_dh_data *get_rdac_data(struct scsi_device *sdev)
-{
- return container_of(sdev->scsi_dh_data, struct rdac_dh_data, dh_data);
-}
-
static struct request *get_rdac_req(struct scsi_device *sdev,
void *buffer, unsigned buflen, int rw)
{
@@ -544,7 +538,7 @@ static int mode_select_handle_sense(struct scsi_device *sdev,
{
struct scsi_sense_hdr sense_hdr;
int err = SCSI_DH_IO, ret;
- struct rdac_dh_data *h = get_rdac_data(sdev);
+ struct rdac_dh_data *h = sdev->handler_data;

ret = scsi_normalize_sense(sensebuf, SCSI_SENSE_BUFFERSIZE, &sense_hdr);
if (!ret)
@@ -589,7 +583,7 @@ static void send_mode_select(struct work_struct *work)
container_of(work, struct rdac_controller, ms_work);
struct request *rq;
struct scsi_device *sdev = ctlr->ms_sdev;
- struct rdac_dh_data *h = get_rdac_data(sdev);
+ struct rdac_dh_data *h = sdev->handler_data;
struct request_queue *q = sdev->request_queue;
int err, retry_cnt = RDAC_RETRY_COUNT;
struct rdac_queue_data *tmp, *qdata;
@@ -648,7 +642,7 @@ static int queue_mode_select(struct scsi_device *sdev,
if (!qdata)
return SCSI_DH_RETRY;

- qdata->h = get_rdac_data(sdev);
+ qdata->h = sdev->handler_data;
qdata->callback_fn = fn;
qdata->callback_data = data;

@@ -667,7 +661,7 @@ static int queue_mode_select(struct scsi_device *sdev,
static int rdac_activate(struct scsi_device *sdev,
activate_complete fn, void *data)
{
- struct rdac_dh_data *h = get_rdac_data(sdev);
+ struct rdac_dh_data *h = sdev->handler_data;
int err = SCSI_DH_OK;
int act = 0;

@@ -702,7 +696,7 @@ done:

static int rdac_prep_fn(struct scsi_device *sdev, struct request *req)
{
- struct rdac_dh_data *h = get_rdac_data(sdev);
+ struct rdac_dh_data *h = sdev->handler_data;
int ret = BLKPREP_OK;

if (h->state != RDAC_STATE_ACTIVE) {
@@ -716,7 +710,7 @@ static int rdac_prep_fn(struct scsi_device *sdev, struct request *req)
static int rdac_check_sense(struct scsi_device *sdev,
struct scsi_sense_hdr *sense_hdr)
{
- struct rdac_dh_data *h = get_rdac_data(sdev);
+ struct rdac_dh_data *h = sdev->handler_data;

RDAC_LOG(RDAC_LOG_SENSE, sdev, "array %s, ctlr %d, "
"I/O returned with sense %02x/%02x/%02x",
@@ -778,7 +772,7 @@ static int rdac_check_sense(struct scsi_device *sdev,
return SCSI_RETURN_NOT_HANDLED;
}

-static struct scsi_dh_data *rdac_bus_attach(struct scsi_device *sdev)
+static int rdac_bus_attach(struct scsi_device *sdev)
{
struct rdac_dh_data *h;
int err;
@@ -787,7 +781,7 @@ static struct scsi_dh_data *rdac_bus_attach(struct scsi_device *sdev)

h = kzalloc(sizeof(*h) , GFP_KERNEL);
if (!h)
- return ERR_PTR(-ENOMEM);
+ return -ENOMEM;
h->lun = UNINITIALIZED_LUN;
h->state = RDAC_STATE_ACTIVE;

@@ -812,7 +806,8 @@ static struct scsi_dh_data *rdac_bus_attach(struct scsi_device *sdev)
RDAC_NAME, h->lun, mode[(int)h->mode],
lun_state[(int)h->lun_state]);

- return &h->dh_data;
+ sdev->handler_data = h;
+ return 0;

clean_ctlr:
spin_lock(&list_lock);
@@ -821,12 +816,12 @@ clean_ctlr:

failed:
kfree(h);
- return ERR_PTR(-EINVAL);
+ return -EINVAL;
}

static void rdac_bus_detach( struct scsi_device *sdev )
{
- struct rdac_dh_data *h = get_rdac_data(sdev);
+ struct rdac_dh_data *h = sdev->handler_data;

if (h->ctlr && h->ctlr->ms_queued)
flush_workqueue(kmpath_rdacd);
diff --git a/drivers/scsi/scsi_dh.c b/drivers/scsi/scsi_dh.c
index 8f0a6dc..f0b100e 100644
--- a/drivers/scsi/scsi_dh.c
+++ b/drivers/scsi/scsi_dh.c
@@ -126,26 +126,19 @@ static struct scsi_device_handler *scsi_dh_lookup(const char *name)
static int scsi_dh_handler_attach(struct scsi_device *sdev,
struct scsi_device_handler *scsi_dh)
{
- struct scsi_dh_data *d;
+ int error;

if (!try_module_get(scsi_dh->module))
return -EINVAL;

- d = scsi_dh->attach(sdev);
- if (IS_ERR(d)) {
- sdev_printk(KERN_ERR, sdev, "%s: Attach failed (%ld)\n",
- scsi_dh->name, PTR_ERR(d));
+ error = scsi_dh->attach(sdev);
+ if (error) {
+ sdev_printk(KERN_ERR, sdev, "%s: Attach failed (%d)\n",
+ scsi_dh->name, error);
module_put(scsi_dh->module);
- return PTR_ERR(d);
}

- d->scsi_dh = scsi_dh;
- d->sdev = sdev;
-
- spin_lock_irq(sdev->request_queue->queue_lock);
- sdev->scsi_dh_data = d;
- spin_unlock_irq(sdev->request_queue->queue_lock);
- return 0;
+ return error;
}

/*
@@ -154,17 +147,9 @@ static int scsi_dh_handler_attach(struct scsi_device *sdev,
*/
static void scsi_dh_handler_detach(struct scsi_device *sdev)
{
- struct scsi_dh_data *scsi_dh_data = sdev->scsi_dh_data;
- struct scsi_device_handler *scsi_dh = scsi_dh_data->scsi_dh;
-
- scsi_dh->detach(sdev);
-
- spin_lock_irq(sdev->request_queue->queue_lock);
- sdev->scsi_dh_data = NULL;
- spin_unlock_irq(sdev->request_queue->queue_lock);
-
- sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", scsi_dh->name);
- module_put(scsi_dh->module);
+ sdev->handler->detach(sdev);
+ sdev_printk(KERN_NOTICE, sdev, "%s: Detached\n", sdev->handler->name);
+ module_put(sdev->handler->module);
}

/*
@@ -182,7 +167,7 @@ store_dh_state(struct device *dev, struct device_attribute *attr,
sdev->sdev_state == SDEV_DEL)
return -ENODEV;

- if (!sdev->scsi_dh_data) {
+ if (!sdev->handler) {
/*
* Attach to a device handler
*/
@@ -190,7 +175,6 @@ store_dh_state(struct device *dev, struct device_attribute *attr,
return err;
err = scsi_dh_handler_attach(sdev, scsi_dh);
} else {
- scsi_dh = sdev->scsi_dh_data->scsi_dh;
if (!strncmp(buf, "detach", 6)) {
/*
* Detach from a device handler
@@ -201,8 +185,8 @@ store_dh_state(struct device *dev, struct device_attribute *attr,
/*
* Activate a device handler
*/
- if (scsi_dh->activate)
- err = scsi_dh->activate(sdev, NULL, NULL);
+ if (sdev->handler->activate)
+ err = sdev->handler->activate(sdev, NULL, NULL);
else
err = 0;
}
@@ -216,10 +200,10 @@ show_dh_state(struct device *dev, struct device_attribute *attr, char *buf)
{
struct scsi_device *sdev = to_scsi_device(dev);

- if (!sdev->scsi_dh_data)
+ if (!sdev->handler)
return snprintf(buf, 20, "detached\n");

- return snprintf(buf, 20, "%s\n", sdev->scsi_dh_data->scsi_dh->name);
+ return snprintf(buf, 20, "%s\n", sdev->handler->name);
}

static struct device_attribute scsi_dh_state_attr =
@@ -246,7 +230,7 @@ int scsi_dh_add_device(struct scsi_device *sdev)

void scsi_dh_remove_device(struct scsi_device *sdev)
{
- if (sdev->scsi_dh_data)
+ if (sdev->handler)
scsi_dh_handler_detach(sdev);
device_remove_file(&sdev->sdev_gendev, &scsi_dh_state_attr);
}
@@ -315,7 +299,6 @@ int scsi_dh_activate(struct request_queue *q, activate_complete fn, void *data)
int err = 0;
unsigned long flags;
struct scsi_device *sdev;
- struct scsi_device_handler *scsi_dh = NULL;
struct device *dev = NULL;

spin_lock_irqsave(q->queue_lock, flags);
@@ -328,10 +311,8 @@ int scsi_dh_activate(struct request_queue *q, activate_complete fn, void *data)
return err;
}

- if (sdev->scsi_dh_data)
- scsi_dh = sdev->scsi_dh_data->scsi_dh;
dev = get_device(&sdev->sdev_gendev);
- if (!scsi_dh || !dev ||
+ if (!sdev->handler || !dev ||
sdev->sdev_state == SDEV_CANCEL ||
sdev->sdev_state == SDEV_DEL)
err = SCSI_DH_NOSYS;
@@ -345,8 +326,8 @@ int scsi_dh_activate(struct request_queue *q, activate_complete fn, void *data)
goto out;
}

- if (scsi_dh->activate)
- err = scsi_dh->activate(sdev, fn, data);
+ if (sdev->handler->activate)
+ err = sdev->handler->activate(sdev, fn, data);
out:
put_device(dev);
return err;
@@ -368,19 +349,18 @@ int scsi_dh_set_params(struct request_queue *q, const char *params)
int err = -SCSI_DH_NOSYS;
unsigned long flags;
struct scsi_device *sdev;
- struct scsi_device_handler *scsi_dh = NULL;

spin_lock_irqsave(q->queue_lock, flags);
sdev = q->queuedata;
- if (sdev && sdev->scsi_dh_data)
- scsi_dh = sdev->scsi_dh_data->scsi_dh;
- if (scsi_dh && scsi_dh->set_params && get_device(&sdev->sdev_gendev))
+ if (sdev->handler &&
+ sdev->handler->set_params &&
+ get_device(&sdev->sdev_gendev))
err = 0;
spin_unlock_irqrestore(q->queue_lock, flags);

if (err)
return err;
- err = scsi_dh->set_params(sdev, params);
+ err = sdev->handler->set_params(sdev, params);
put_device(&sdev->sdev_gendev);
return err;
}
@@ -412,8 +392,8 @@ int scsi_dh_attach(struct request_queue *q, const char *name)
if (err)
return err;

- if (sdev->scsi_dh_data) {
- if (sdev->scsi_dh_data->scsi_dh != scsi_dh)
+ if (sdev->handler) {
+ if (sdev->handler != scsi_dh)
err = -EBUSY;
goto out_put_device;
}
@@ -450,8 +430,8 @@ const char *scsi_dh_attached_handler_name(struct request_queue *q, gfp_t gfp)
if (!sdev)
return NULL;

- if (sdev->scsi_dh_data)
- handler_name = kstrdup(sdev->scsi_dh_data->scsi_dh->name, gfp);
+ if (sdev->handler)
+ handler_name = kstrdup(sdev->handler->name, gfp);

put_device(&sdev->sdev_gendev);
return handler_name;
diff --git a/drivers/scsi/scsi_error.c b/drivers/scsi/scsi_error.c
index c95a4e9..a29c0c9 100644
--- a/drivers/scsi/scsi_error.c
+++ b/drivers/scsi/scsi_error.c
@@ -37,6 +37,7 @@
#include <scsi/scsi_transport.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_ioctl.h>
+#include <scsi/scsi_dh.h>
#include <scsi/sg.h>

#include "scsi_priv.h"
@@ -460,11 +461,10 @@ static int scsi_check_sense(struct scsi_cmnd *scmd)
if (scsi_sense_is_deferred(&sshdr))
return NEEDS_RETRY;

- if (sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh &&
- sdev->scsi_dh_data->scsi_dh->check_sense) {
+ if (sdev->handler && sdev->handler->check_sense) {
int rc;

- rc = sdev->scsi_dh_data->scsi_dh->check_sense(sdev, &sshdr);
+ rc = sdev->handler->check_sense(sdev, &sshdr);
if (rc != SCSI_RETURN_NOT_HANDLED)
return rc;
/* handler does not care. Drop down to default handling */
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index b1a2631..01c92ca 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -31,6 +31,7 @@
#include <scsi/scsi_driver.h>
#include <scsi/scsi_eh.h>
#include <scsi/scsi_host.h>
+#include <scsi/scsi_dh.h>

#include <trace/events/scsi.h>

@@ -1248,9 +1249,8 @@ static int scsi_setup_fs_cmnd(struct scsi_device *sdev, struct request *req)
{
struct scsi_cmnd *cmd = req->special;

- if (unlikely(sdev->scsi_dh_data && sdev->scsi_dh_data->scsi_dh
- && sdev->scsi_dh_data->scsi_dh->prep_fn)) {
- int ret = sdev->scsi_dh_data->scsi_dh->prep_fn(sdev, req);
+ if (unlikely(sdev->handler && sdev->handler->prep_fn)) {
+ int ret = sdev->handler->prep_fn(sdev, req);
if (ret != BLKPREP_OK)
return ret;
}
diff --git a/include/scsi/scsi_device.h b/include/scsi/scsi_device.h
index dcc5c69..05583d8 100644
--- a/include/scsi/scsi_device.h
+++ b/include/scsi/scsi_device.h
@@ -195,32 +195,13 @@ struct scsi_device {
struct execute_work ew; /* used to get process context on put */
struct work_struct requeue_work;

- struct scsi_dh_data *scsi_dh_data;
+ struct scsi_device_handler *handler;
+ void *handler_data;
+
enum scsi_device_state sdev_state;
unsigned long sdev_data[0];
} __attribute__((aligned(sizeof(unsigned long))));

-typedef void (*activate_complete)(void *, int);
-struct scsi_device_handler {
- /* Used by the infrastructure */
- struct list_head list; /* list of scsi_device_handlers */
-
- /* Filled by the hardware handler */
- struct module *module;
- const char *name;
- int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
- struct scsi_dh_data *(*attach)(struct scsi_device *);
- void (*detach)(struct scsi_device *);
- int (*activate)(struct scsi_device *, activate_complete, void *);
- int (*prep_fn)(struct scsi_device *, struct request *);
- int (*set_params)(struct scsi_device *, const char *);
-};
-
-struct scsi_dh_data {
- struct scsi_device_handler *scsi_dh;
- struct scsi_device *sdev;
-};
-
#define to_scsi_device(d) \
container_of(d, struct scsi_device, sdev_gendev)
#define class_to_sdev(d) \
diff --git a/include/scsi/scsi_dh.h b/include/scsi/scsi_dh.h
index 3a37b4c45..85d7317 100644
--- a/include/scsi/scsi_dh.h
+++ b/include/scsi/scsi_dh.h
@@ -55,6 +55,23 @@ enum {
SCSI_DH_NOSYS,
SCSI_DH_DRIVER_MAX,
};
+
+typedef void (*activate_complete)(void *, int);
+struct scsi_device_handler {
+ /* Used by the infrastructure */
+ struct list_head list; /* list of scsi_device_handlers */
+
+ /* Filled by the hardware handler */
+ struct module *module;
+ const char *name;
+ int (*check_sense)(struct scsi_device *, struct scsi_sense_hdr *);
+ int (*attach)(struct scsi_device *);
+ void (*detach)(struct scsi_device *);
+ int (*activate)(struct scsi_device *, activate_complete, void *);
+ int (*prep_fn)(struct scsi_device *, struct request *);
+ int (*set_params)(struct scsi_device *, const char *);
+};
+
#ifdef CONFIG_SCSI_DH
extern int scsi_dh_activate(struct request_queue *, activate_complete, void *);
extern int scsi_dh_attach(struct request_queue *, const char *);
--
1.9.1