kevin/linux
1
Fork 0
Code
b4fe2a0342
linux/drivers/usb/storage/uas.c
Jeff Garzik f281233d3e SCSI host lock push-down 
Move the mid-layer's ->queuecommand() invocation from being locked
with the host lock to being unlocked to facilitate speeding up the
critical path for drivers who don't need this lock taken anyway.

The patch below presents a simple SCSI host lock push-down as an
equivalent transformation.  No locking or other behavior should change
with this patch.  All existing bugs and locking orders are preserved.

Additionally, add one parameter to queuecommand,
	struct Scsi_Host *
and remove one parameter from queuecommand,
	void (*done)(struct scsi_cmnd *)

Scsi_Host* is a convenient pointer that most host drivers need anyway,
and 'done' is redundant to struct scsi_cmnd->scsi_done.

Minimal code disturbance was attempted with this change.  Most drivers
needed only two one-line modifications for their host lock push-down.

Signed-off-by: Jeff Garzik <jgarzik@redhat.com>
Acked-by: James Bottomley <James.Bottomley@suse.de>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2010-11-16 13:33:23 -08:00

751 lines
19 KiB
C
Raw Blame History

/*
* USB Attached SCSI
* Note that this is not the same as the USB Mass Storage driver
*
* Copyright Matthew Wilcox for Intel Corp, 2010
* Copyright Sarah Sharp for Intel Corp, 2010
*
* Distributed under the terms of the GNU GPL, version two.
*/
#include <linux/blkdev.h>
#include <linux/slab.h>
#include <linux/types.h>
#include <linux/usb.h>
#include <linux/usb/storage.h>
#include <scsi/scsi.h>
#include <scsi/scsi_dbg.h>
#include <scsi/scsi_cmnd.h>
#include <scsi/scsi_device.h>
#include <scsi/scsi_host.h>
#include <scsi/scsi_tcq.h>
/* Common header for all IUs */
struct iu {
__u8 iu_id;
__u8 rsvd1;
__be16 tag;
};
enum {
IU_ID_COMMAND = 0x01,
IU_ID_STATUS = 0x03,
IU_ID_RESPONSE = 0x04,
IU_ID_TASK_MGMT = 0x05,
IU_ID_READ_READY = 0x06,
IU_ID_WRITE_READY = 0x07,
};
struct command_iu {
__u8 iu_id;
__u8 rsvd1;
__be16 tag;
__u8 prio_attr;
__u8 rsvd5;
__u8 len;
__u8 rsvd7;
struct scsi_lun lun;
__u8 cdb[16]; /* XXX: Overflow-checking tools may misunderstand */
};
struct sense_iu {
__u8 iu_id;
__u8 rsvd1;
__be16 tag;
__be16 status_qual;
__u8 status;
__u8 service_response;
__u8 rsvd8[6];
__be16 len;
__u8 sense[SCSI_SENSE_BUFFERSIZE];
};
/*
* The r00-r01c specs define this version of the SENSE IU data structure.
* It's still in use by several different firmware releases.
*/
struct sense_iu_old {
__u8 iu_id;
__u8 rsvd1;
__be16 tag;
__be16 len;
__u8 status;
__u8 service_response;
__u8 sense[SCSI_SENSE_BUFFERSIZE];
};
enum {
CMD_PIPE_ID = 1,
STATUS_PIPE_ID = 2,
DATA_IN_PIPE_ID = 3,
DATA_OUT_PIPE_ID = 4,
UAS_SIMPLE_TAG = 0,
UAS_HEAD_TAG = 1,
UAS_ORDERED_TAG = 2,
UAS_ACA = 4,
};
struct uas_dev_info {
struct usb_interface *intf;
struct usb_device *udev;
int qdepth;
unsigned cmd_pipe, status_pipe, data_in_pipe, data_out_pipe;
unsigned use_streams:1;
unsigned uas_sense_old:1;
};
enum {
ALLOC_SENSE_URB = (1 << 0),
SUBMIT_SENSE_URB = (1 << 1),
ALLOC_DATA_IN_URB = (1 << 2),
SUBMIT_DATA_IN_URB = (1 << 3),
ALLOC_DATA_OUT_URB = (1 << 4),
SUBMIT_DATA_OUT_URB = (1 << 5),
ALLOC_CMD_URB = (1 << 6),
SUBMIT_CMD_URB = (1 << 7),
};
/* Overrides scsi_pointer */
struct uas_cmd_info {
unsigned int state;
unsigned int stream;
struct urb *cmd_urb;
struct urb *sense_urb;
struct urb *data_in_urb;
struct urb *data_out_urb;
struct list_head list;
};
/* I hate forward declarations, but I actually have a loop */
static int uas_submit_urbs(struct scsi_cmnd *cmnd,
struct uas_dev_info *devinfo, gfp_t gfp);
static DEFINE_SPINLOCK(uas_work_lock);
static LIST_HEAD(uas_work_list);
static void uas_do_work(struct work_struct *work)
{
struct uas_cmd_info *cmdinfo;
struct list_head list;
spin_lock_irq(&uas_work_lock);
list_replace_init(&uas_work_list, &list);
spin_unlock_irq(&uas_work_lock);
list_for_each_entry(cmdinfo, &list, list) {
struct scsi_pointer *scp = (void *)cmdinfo;
struct scsi_cmnd *cmnd = container_of(scp,
struct scsi_cmnd, SCp);
uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_KERNEL);
}
}
static DECLARE_WORK(uas_work, uas_do_work);
static void uas_sense(struct urb *urb, struct scsi_cmnd *cmnd)
{
struct sense_iu *sense_iu = urb->transfer_buffer;
struct scsi_device *sdev = cmnd->device;
if (urb->actual_length > 16) {
unsigned len = be16_to_cpup(&sense_iu->len);
if (len + 16 != urb->actual_length) {
int newlen = min(len + 16, urb->actual_length) - 16;
if (newlen < 0)
newlen = 0;
sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
"disagrees with IU sense data length %d, "
"using %d bytes of sense data\n", __func__,
urb->actual_length, len, newlen);
len = newlen;
}
memcpy(cmnd->sense_buffer, sense_iu->sense, len);
}
cmnd->result = sense_iu->status;
if (sdev->current_cmnd)
sdev->current_cmnd = NULL;
cmnd->scsi_done(cmnd);
usb_free_urb(urb);
}
static void uas_sense_old(struct urb *urb, struct scsi_cmnd *cmnd)
{
struct sense_iu_old *sense_iu = urb->transfer_buffer;
struct scsi_device *sdev = cmnd->device;
if (urb->actual_length > 8) {
unsigned len = be16_to_cpup(&sense_iu->len) - 2;
if (len + 8 != urb->actual_length) {
int newlen = min(len + 8, urb->actual_length) - 8;
if (newlen < 0)
newlen = 0;
sdev_printk(KERN_INFO, sdev, "%s: urb length %d "
"disagrees with IU sense data length %d, "
"using %d bytes of sense data\n", __func__,
urb->actual_length, len, newlen);
len = newlen;
}
memcpy(cmnd->sense_buffer, sense_iu->sense, len);
}
cmnd->result = sense_iu->status;
if (sdev->current_cmnd)
sdev->current_cmnd = NULL;
cmnd->scsi_done(cmnd);
usb_free_urb(urb);
}
static void uas_xfer_data(struct urb *urb, struct scsi_cmnd *cmnd,
unsigned direction)
{
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
int err;
cmdinfo->state = direction | SUBMIT_SENSE_URB;
err = uas_submit_urbs(cmnd, cmnd->device->hostdata, GFP_ATOMIC);
if (err) {
spin_lock(&uas_work_lock);
list_add_tail(&cmdinfo->list, &uas_work_list);
spin_unlock(&uas_work_lock);
schedule_work(&uas_work);
}
}
static void uas_stat_cmplt(struct urb *urb)
{
struct iu *iu = urb->transfer_buffer;
struct scsi_device *sdev = urb->context;
struct uas_dev_info *devinfo = sdev->hostdata;
struct scsi_cmnd *cmnd;
u16 tag;
if (urb->status) {
dev_err(&urb->dev->dev, "URB BAD STATUS %d\n", urb->status);
usb_free_urb(urb);
return;
}
tag = be16_to_cpup(&iu->tag) - 1;
if (sdev->current_cmnd)
cmnd = sdev->current_cmnd;
else
cmnd = scsi_find_tag(sdev, tag);
if (!cmnd)
return;
switch (iu->iu_id) {
case IU_ID_STATUS:
if (urb->actual_length < 16)
devinfo->uas_sense_old = 1;
if (devinfo->uas_sense_old)
uas_sense_old(urb, cmnd);
else
uas_sense(urb, cmnd);
break;
case IU_ID_READ_READY:
uas_xfer_data(urb, cmnd, SUBMIT_DATA_IN_URB);
break;
case IU_ID_WRITE_READY:
uas_xfer_data(urb, cmnd, SUBMIT_DATA_OUT_URB);
break;
default:
scmd_printk(KERN_ERR, cmnd,
"Bogus IU (%d) received on status pipe\n", iu->iu_id);
}
}
static void uas_data_cmplt(struct urb *urb)
{
struct scsi_data_buffer *sdb = urb->context;
sdb->resid = sdb->length - urb->actual_length;
usb_free_urb(urb);
}
static struct urb *uas_alloc_data_urb(struct uas_dev_info *devinfo, gfp_t gfp,
unsigned int pipe, u16 stream_id,
struct scsi_data_buffer *sdb,
enum dma_data_direction dir)
{
struct usb_device *udev = devinfo->udev;
struct urb *urb = usb_alloc_urb(0, gfp);
if (!urb)
goto out;
usb_fill_bulk_urb(urb, udev, pipe, NULL, sdb->length, uas_data_cmplt,
sdb);
if (devinfo->use_streams)
urb->stream_id = stream_id;
urb->num_sgs = udev->bus->sg_tablesize ? sdb->table.nents : 0;
urb->sg = sdb->table.sgl;
out:
return urb;
}
static struct urb *uas_alloc_sense_urb(struct uas_dev_info *devinfo, gfp_t gfp,
struct scsi_cmnd *cmnd, u16 stream_id)
{
struct usb_device *udev = devinfo->udev;
struct urb *urb = usb_alloc_urb(0, gfp);
struct sense_iu *iu;
if (!urb)
goto out;
iu = kmalloc(sizeof(*iu), gfp);
if (!iu)
goto free;
usb_fill_bulk_urb(urb, udev, devinfo->status_pipe, iu, sizeof(*iu),
uas_stat_cmplt, cmnd->device);
urb->stream_id = stream_id;
urb->transfer_flags |= URB_FREE_BUFFER;
out:
return urb;
free:
usb_free_urb(urb);
return NULL;
}
static struct urb *uas_alloc_cmd_urb(struct uas_dev_info *devinfo, gfp_t gfp,
struct scsi_cmnd *cmnd, u16 stream_id)
{
struct usb_device *udev = devinfo->udev;
struct scsi_device *sdev = cmnd->device;
struct urb *urb = usb_alloc_urb(0, gfp);
struct command_iu *iu;
int len;
if (!urb)
goto out;
len = cmnd->cmd_len - 16;
if (len < 0)
len = 0;
len = ALIGN(len, 4);
iu = kmalloc(sizeof(*iu) + len, gfp);
if (!iu)
goto free;
iu->iu_id = IU_ID_COMMAND;
iu->tag = cpu_to_be16(stream_id);
iu->prio_attr = UAS_SIMPLE_TAG;
iu->len = len;
int_to_scsilun(sdev->lun, &iu->lun);
memcpy(iu->cdb, cmnd->cmnd, cmnd->cmd_len);
usb_fill_bulk_urb(urb, udev, devinfo->cmd_pipe, iu, sizeof(*iu) + len,
usb_free_urb, NULL);
urb->transfer_flags |= URB_FREE_BUFFER;
out:
return urb;
free:
usb_free_urb(urb);
return NULL;
}
/*
* Why should I request the Status IU before sending the Command IU? Spec
* says to, but also says the device may receive them in any order. Seems
* daft to me.
*/
static int uas_submit_urbs(struct scsi_cmnd *cmnd,
struct uas_dev_info *devinfo, gfp_t gfp)
{
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
if (cmdinfo->state & ALLOC_SENSE_URB) {
cmdinfo->sense_urb = uas_alloc_sense_urb(devinfo, gfp, cmnd,
cmdinfo->stream);
if (!cmdinfo->sense_urb)
return SCSI_MLQUEUE_DEVICE_BUSY;
cmdinfo->state &= ~ALLOC_SENSE_URB;
}
if (cmdinfo->state & SUBMIT_SENSE_URB) {
if (usb_submit_urb(cmdinfo->sense_urb, gfp)) {
scmd_printk(KERN_INFO, cmnd,
"sense urb submission failure\n");
return SCSI_MLQUEUE_DEVICE_BUSY;
}
cmdinfo->state &= ~SUBMIT_SENSE_URB;
}
if (cmdinfo->state & ALLOC_DATA_IN_URB) {
cmdinfo->data_in_urb = uas_alloc_data_urb(devinfo, gfp,
devinfo->data_in_pipe, cmdinfo->stream,
scsi_in(cmnd), DMA_FROM_DEVICE);
if (!cmdinfo->data_in_urb)
return SCSI_MLQUEUE_DEVICE_BUSY;
cmdinfo->state &= ~ALLOC_DATA_IN_URB;
}
if (cmdinfo->state & SUBMIT_DATA_IN_URB) {
if (usb_submit_urb(cmdinfo->data_in_urb, gfp)) {
scmd_printk(KERN_INFO, cmnd,
"data in urb submission failure\n");
return SCSI_MLQUEUE_DEVICE_BUSY;
}
cmdinfo->state &= ~SUBMIT_DATA_IN_URB;
}
if (cmdinfo->state & ALLOC_DATA_OUT_URB) {
cmdinfo->data_out_urb = uas_alloc_data_urb(devinfo, gfp,
devinfo->data_out_pipe, cmdinfo->stream,
scsi_out(cmnd), DMA_TO_DEVICE);
if (!cmdinfo->data_out_urb)
return SCSI_MLQUEUE_DEVICE_BUSY;
cmdinfo->state &= ~ALLOC_DATA_OUT_URB;
}
if (cmdinfo->state & SUBMIT_DATA_OUT_URB) {
if (usb_submit_urb(cmdinfo->data_out_urb, gfp)) {
scmd_printk(KERN_INFO, cmnd,
"data out urb submission failure\n");
return SCSI_MLQUEUE_DEVICE_BUSY;
}
cmdinfo->state &= ~SUBMIT_DATA_OUT_URB;
}
if (cmdinfo->state & ALLOC_CMD_URB) {
cmdinfo->cmd_urb = uas_alloc_cmd_urb(devinfo, gfp, cmnd,
cmdinfo->stream);
if (!cmdinfo->cmd_urb)
return SCSI_MLQUEUE_DEVICE_BUSY;
cmdinfo->state &= ~ALLOC_CMD_URB;
}
if (cmdinfo->state & SUBMIT_CMD_URB) {
if (usb_submit_urb(cmdinfo->cmd_urb, gfp)) {
scmd_printk(KERN_INFO, cmnd,
"cmd urb submission failure\n");
return SCSI_MLQUEUE_DEVICE_BUSY;
}
cmdinfo->state &= ~SUBMIT_CMD_URB;
}
return 0;
}
static int uas_queuecommand_lck(struct scsi_cmnd *cmnd,
void (*done)(struct scsi_cmnd *))
{
struct scsi_device *sdev = cmnd->device;
struct uas_dev_info *devinfo = sdev->hostdata;
struct uas_cmd_info *cmdinfo = (void *)&cmnd->SCp;
int err;
BUILD_BUG_ON(sizeof(struct uas_cmd_info) > sizeof(struct scsi_pointer));
if (!cmdinfo->sense_urb && sdev->current_cmnd)
return SCSI_MLQUEUE_DEVICE_BUSY;
if (blk_rq_tagged(cmnd->request)) {
cmdinfo->stream = cmnd->request->tag + 1;
} else {
sdev->current_cmnd = cmnd;
cmdinfo->stream = 1;
}
cmnd->scsi_done = done;
cmdinfo->state = ALLOC_SENSE_URB | SUBMIT_SENSE_URB |
ALLOC_CMD_URB | SUBMIT_CMD_URB;
switch (cmnd->sc_data_direction) {
case DMA_FROM_DEVICE:
cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
break;
case DMA_BIDIRECTIONAL:
cmdinfo->state |= ALLOC_DATA_IN_URB | SUBMIT_DATA_IN_URB;
case DMA_TO_DEVICE:
cmdinfo->state |= ALLOC_DATA_OUT_URB | SUBMIT_DATA_OUT_URB;
case DMA_NONE:
break;
}
if (!devinfo->use_streams) {
cmdinfo->state &= ~(SUBMIT_DATA_IN_URB | SUBMIT_DATA_OUT_URB);
cmdinfo->stream = 0;
}
err = uas_submit_urbs(cmnd, devinfo, GFP_ATOMIC);
if (err) {
/* If we did nothing, give up now */
if (cmdinfo->state & SUBMIT_SENSE_URB) {
usb_free_urb(cmdinfo->sense_urb);
return SCSI_MLQUEUE_DEVICE_BUSY;
}
spin_lock(&uas_work_lock);
list_add_tail(&cmdinfo->list, &uas_work_list);
spin_unlock(&uas_work_lock);
schedule_work(&uas_work);
}
return 0;
}
static DEF_SCSI_QCMD(uas_queuecommand)
static int uas_eh_abort_handler(struct scsi_cmnd *cmnd)
{
struct scsi_device *sdev = cmnd->device;
sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__,
cmnd->request->tag);
/* XXX: Send ABORT TASK Task Management command */
return FAILED;
}
static int uas_eh_device_reset_handler(struct scsi_cmnd *cmnd)
{
struct scsi_device *sdev = cmnd->device;
sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__,
cmnd->request->tag);
/* XXX: Send LOGICAL UNIT RESET Task Management command */
return FAILED;
}
static int uas_eh_target_reset_handler(struct scsi_cmnd *cmnd)
{
struct scsi_device *sdev = cmnd->device;
sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__,
cmnd->request->tag);
/* XXX: Can we reset just the one USB interface?
* Would calling usb_set_interface() have the right effect?
*/
return FAILED;
}
static int uas_eh_bus_reset_handler(struct scsi_cmnd *cmnd)
{
struct scsi_device *sdev = cmnd->device;
struct uas_dev_info *devinfo = sdev->hostdata;
struct usb_device *udev = devinfo->udev;
sdev_printk(KERN_INFO, sdev, "%s tag %d\n", __func__,
cmnd->request->tag);
if (usb_reset_device(udev))
return SUCCESS;
return FAILED;
}
static int uas_slave_alloc(struct scsi_device *sdev)
{
sdev->hostdata = (void *)sdev->host->hostdata[0];
return 0;
}
static int uas_slave_configure(struct scsi_device *sdev)
{
struct uas_dev_info *devinfo = sdev->hostdata;
scsi_set_tag_type(sdev, MSG_ORDERED_TAG);
scsi_activate_tcq(sdev, devinfo->qdepth - 1);
return 0;
}
static struct scsi_host_template uas_host_template = {
.module = THIS_MODULE,
.name = "uas",
.queuecommand = uas_queuecommand,
.slave_alloc = uas_slave_alloc,
.slave_configure = uas_slave_configure,
.eh_abort_handler = uas_eh_abort_handler,
.eh_device_reset_handler = uas_eh_device_reset_handler,
.eh_target_reset_handler = uas_eh_target_reset_handler,
.eh_bus_reset_handler = uas_eh_bus_reset_handler,
.can_queue = 65536, /* Is there a limit on the _host_ ? */
.this_id = -1,
.sg_tablesize = SG_NONE,
.cmd_per_lun = 1, /* until we override it */
.skip_settle_delay = 1,
.ordered_tag = 1,
};
static struct usb_device_id uas_usb_ids[] = {
{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_BULK) },
{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, USB_PR_UAS) },
/* 0xaa is a prototype device I happen to have access to */
{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, USB_SC_SCSI, 0xaa) },
{ }
};
MODULE_DEVICE_TABLE(usb, uas_usb_ids);
static void uas_configure_endpoints(struct uas_dev_info *devinfo)
{
struct usb_host_endpoint *eps[4] = { };
struct usb_interface *intf = devinfo->intf;
struct usb_device *udev = devinfo->udev;
struct usb_host_endpoint *endpoint = intf->cur_altsetting->endpoint;
unsigned i, n_endpoints = intf->cur_altsetting->desc.bNumEndpoints;
devinfo->uas_sense_old = 0;
for (i = 0; i < n_endpoints; i++) {
unsigned char *extra = endpoint[i].extra;
int len = endpoint[i].extralen;
while (len > 1) {
if (extra[1] == USB_DT_PIPE_USAGE) {
unsigned pipe_id = extra[2];
if (pipe_id > 0 && pipe_id < 5)
eps[pipe_id - 1] = &endpoint[i];
break;
}
len -= extra[0];
extra += extra[0];
}
}
/*
* Assume that if we didn't find a control pipe descriptor, we're
* using a device with old firmware that happens to be set up like
* this.
*/
if (!eps[0]) {
devinfo->cmd_pipe = usb_sndbulkpipe(udev, 1);
devinfo->status_pipe = usb_rcvbulkpipe(udev, 1);
devinfo->data_in_pipe = usb_rcvbulkpipe(udev, 2);
devinfo->data_out_pipe = usb_sndbulkpipe(udev, 2);
eps[1] = usb_pipe_endpoint(udev, devinfo->status_pipe);
eps[2] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
eps[3] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
} else {
devinfo->cmd_pipe = usb_sndbulkpipe(udev,
eps[0]->desc.bEndpointAddress);
devinfo->status_pipe = usb_rcvbulkpipe(udev,
eps[1]->desc.bEndpointAddress);
devinfo->data_in_pipe = usb_rcvbulkpipe(udev,
eps[2]->desc.bEndpointAddress);
devinfo->data_out_pipe = usb_sndbulkpipe(udev,
eps[3]->desc.bEndpointAddress);
}
devinfo->qdepth = usb_alloc_streams(devinfo->intf, eps + 1, 3, 256,
GFP_KERNEL);
if (devinfo->qdepth < 0) {
devinfo->qdepth = 256;
devinfo->use_streams = 0;
} else {
devinfo->use_streams = 1;
}
}
/*
* XXX: What I'd like to do here is register a SCSI host for each USB host in
* the system. Follow usb-storage's design of registering a SCSI host for
* each USB device for the moment. Can implement this by walking up the
* USB hierarchy until we find a USB host.
*/
static int uas_probe(struct usb_interface *intf, const struct usb_device_id *id)
{
int result;
struct Scsi_Host *shost;
struct uas_dev_info *devinfo;
struct usb_device *udev = interface_to_usbdev(intf);
if (id->bInterfaceProtocol == 0x50) {
int ifnum = intf->cur_altsetting->desc.bInterfaceNumber;
/* XXX: Shouldn't assume that 1 is the alternative we want */
int ret = usb_set_interface(udev, ifnum, 1);
if (ret)
return -ENODEV;
}
devinfo = kmalloc(sizeof(struct uas_dev_info), GFP_KERNEL);
if (!devinfo)
return -ENOMEM;
result = -ENOMEM;
shost = scsi_host_alloc(&uas_host_template, sizeof(void *));
if (!shost)
goto free;
shost->max_cmd_len = 16 + 252;
shost->max_id = 1;
shost->sg_tablesize = udev->bus->sg_tablesize;
result = scsi_add_host(shost, &intf->dev);
if (result)
goto free;
shost->hostdata[0] = (unsigned long)devinfo;
devinfo->intf = intf;
devinfo->udev = udev;
uas_configure_endpoints(devinfo);
scsi_scan_host(shost);
usb_set_intfdata(intf, shost);
return result;
free:
kfree(devinfo);
if (shost)
scsi_host_put(shost);
return result;
}
static int uas_pre_reset(struct usb_interface *intf)
{
/* XXX: Need to return 1 if it's not our device in error handling */
return 0;
}
static int uas_post_reset(struct usb_interface *intf)
{
/* XXX: Need to return 1 if it's not our device in error handling */
return 0;
}
static void uas_disconnect(struct usb_interface *intf)
{
struct usb_device *udev = interface_to_usbdev(intf);
struct usb_host_endpoint *eps[3];
struct Scsi_Host *shost = usb_get_intfdata(intf);
struct uas_dev_info *devinfo = (void *)shost->hostdata[0];
scsi_remove_host(shost);
eps[0] = usb_pipe_endpoint(udev, devinfo->status_pipe);
eps[1] = usb_pipe_endpoint(udev, devinfo->data_in_pipe);
eps[2] = usb_pipe_endpoint(udev, devinfo->data_out_pipe);
usb_free_streams(intf, eps, 3, GFP_KERNEL);
kfree(devinfo);
}
/*
* XXX: Should this plug into libusual so we can auto-upgrade devices from
* Bulk-Only to UAS?
*/
static struct usb_driver uas_driver = {
.name = "uas",
.probe = uas_probe,
.disconnect = uas_disconnect,
.pre_reset = uas_pre_reset,
.post_reset = uas_post_reset,
.id_table = uas_usb_ids,
};
static int uas_init(void)
{
return usb_register(&uas_driver);
}
static void uas_exit(void)
{
usb_deregister(&uas_driver);
}
module_init(uas_init);
module_exit(uas_exit);
MODULE_LICENSE("GPL");
MODULE_AUTHOR("Matthew Wilcox and Sarah Sharp");
View Git Blame Copy Permalink