aboutsummaryrefslogtreecommitdiff
path: root/drivers/block/ub.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/block/ub.c')
-rw-r--r--drivers/block/ub.c439
1 files changed, 303 insertions, 136 deletions
diff --git a/drivers/block/ub.c b/drivers/block/ub.c
index bfb23d543ff..a05fe5843e6 100644
--- a/drivers/block/ub.c
+++ b/drivers/block/ub.c
@@ -9,7 +9,6 @@
*
* TODO (sorted by decreasing priority)
* -- Kill first_open (Al Viro fixed the block layer now)
- * -- Do resets with usb_device_reset (needs a thread context, use khubd)
* -- set readonly flag for CDs, set removable flag for CF readers
* -- do inquiry and verify we got a disk and not a tape (for LUN mismatch)
* -- special case some senses, e.g. 3a/0 -> no media present, reduce retries
@@ -29,6 +28,7 @@
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/usb.h>
+#include <linux/usb_usual.h>
#include <linux/blkdev.h>
#include <linux/devfs_fs_kernel.h>
#include <linux/timer.h>
@@ -107,16 +107,6 @@
*/
/*
- * Definitions which have to be scattered once we understand the layout better.
- */
-
-/* Transport (despite PR in the name) */
-#define US_PR_BULK 0x50 /* bulk only */
-
-/* Protocol */
-#define US_SC_SCSI 0x06 /* Transparent */
-
-/*
* This many LUNs per USB device.
* Every one of them takes a host, see UB_MAX_HOSTS.
*/
@@ -125,7 +115,7 @@
/*
*/
-#define UB_MINORS_PER_MAJOR 8
+#define UB_PARTS_PER_LUN 8
#define UB_MAX_CDB_SIZE 16 /* Corresponds to Bulk */
@@ -245,6 +235,13 @@ struct ub_scsi_cmd {
void *back;
};
+struct ub_request {
+ struct request *rq;
+ unsigned int current_try;
+ unsigned int nsg; /* sgv[nsg] */
+ struct scatterlist sgv[UB_MAX_REQ_SG];
+};
+
/*
*/
struct ub_capacity {
@@ -340,6 +337,8 @@ struct ub_lun {
int readonly;
int first_open; /* Kludge. See ub_bd_open. */
+ struct ub_request urq;
+
/* Use Ingo's mempool if or when we have more than one command. */
/*
* Currently we never need more than one command for the whole device.
@@ -360,6 +359,7 @@ struct ub_dev {
atomic_t poison; /* The USB device is disconnected */
int openc; /* protected by ub_lock! */
/* kref is too implicit for our taste */
+ int reset; /* Reset is running */
unsigned int tagcnt;
char name[12];
struct usb_device *dev;
@@ -387,6 +387,9 @@ struct ub_dev {
struct bulk_cs_wrap work_bcs;
struct usb_ctrlrequest work_cr;
+ struct work_struct reset_work;
+ wait_queue_head_t reset_wait;
+
int sg_stat[6];
struct ub_scsi_trace tr;
};
@@ -395,12 +398,14 @@ struct ub_dev {
*/
static void ub_cleanup(struct ub_dev *sc);
static int ub_request_fn_1(struct ub_lun *lun, struct request *rq);
-static int ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
- struct ub_scsi_cmd *cmd, struct request *rq);
-static int ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
- struct ub_scsi_cmd *cmd, struct request *rq);
+static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
+ struct ub_scsi_cmd *cmd, struct ub_request *urq);
+static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
+ struct ub_scsi_cmd *cmd, struct ub_request *urq);
static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
static void ub_end_rq(struct request *rq, int uptodate);
+static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun,
+ struct ub_request *urq, struct ub_scsi_cmd *cmd);
static int ub_submit_scsi(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
static void ub_urb_complete(struct urb *urb, struct pt_regs *pt);
static void ub_scsi_action(unsigned long _dev);
@@ -415,6 +420,8 @@ static void ub_state_sense(struct ub_dev *sc, struct ub_scsi_cmd *cmd);
static int ub_submit_clear_stall(struct ub_dev *sc, struct ub_scsi_cmd *cmd,
int stalled_pipe);
static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd);
+static void ub_reset_enter(struct ub_dev *sc);
+static void ub_reset_task(void *arg);
static int ub_sync_tur(struct ub_dev *sc, struct ub_lun *lun);
static int ub_sync_read_cap(struct ub_dev *sc, struct ub_lun *lun,
struct ub_capacity *ret);
@@ -422,13 +429,18 @@ static int ub_probe_lun(struct ub_dev *sc, int lnum);
/*
*/
+#ifdef CONFIG_USB_LIBUSUAL
+
+#define ub_usb_ids storage_usb_ids
+#else
+
static struct usb_device_id ub_usb_ids[] = {
- // { USB_DEVICE_VER(0x0781, 0x0002, 0x0009, 0x0009) }, /* SDDR-31 */
{ USB_INTERFACE_INFO(USB_CLASS_MASS_STORAGE, US_SC_SCSI, US_PR_BULK) },
{ }
};
MODULE_DEVICE_TABLE(usb, ub_usb_ids);
+#endif /* CONFIG_USB_LIBUSUAL */
/*
* Find me a way to identify "next free minor" for add_disk(),
@@ -522,6 +534,9 @@ static ssize_t ub_diag_show(struct device *dev, struct device_attribute *attr,
spin_lock_irqsave(&sc->lock, flags);
cnt += sprintf(page + cnt,
+ "poison %d reset %d\n",
+ atomic_read(&sc->poison), sc->reset);
+ cnt += sprintf(page + cnt,
"qlen %d qmax %d\n",
sc->cmd_queue.qlen, sc->cmd_queue.qmax);
cnt += sprintf(page + cnt,
@@ -770,7 +785,8 @@ static int ub_request_fn_1(struct ub_lun *lun, struct request *rq)
{
struct ub_dev *sc = lun->udev;
struct ub_scsi_cmd *cmd;
- int rc;
+ struct ub_request *urq;
+ int n_elem;
if (atomic_read(&sc->poison) || lun->changed) {
blkdev_dequeue_request(rq);
@@ -778,65 +794,70 @@ static int ub_request_fn_1(struct ub_lun *lun, struct request *rq)
return 0;
}
+ if (lun->urq.rq != NULL)
+ return -1;
if ((cmd = ub_get_cmd(lun)) == NULL)
return -1;
memset(cmd, 0, sizeof(struct ub_scsi_cmd));
blkdev_dequeue_request(rq);
+
+ urq = &lun->urq;
+ memset(urq, 0, sizeof(struct ub_request));
+ urq->rq = rq;
+
+ /*
+ * get scatterlist from block layer
+ */
+ n_elem = blk_rq_map_sg(lun->disk->queue, rq, &urq->sgv[0]);
+ if (n_elem < 0) {
+ printk(KERN_INFO "%s: failed request map (%d)\n",
+ lun->name, n_elem); /* P3 */
+ goto drop;
+ }
+ if (n_elem > UB_MAX_REQ_SG) { /* Paranoia */
+ printk(KERN_WARNING "%s: request with %d segments\n",
+ lun->name, n_elem);
+ goto drop;
+ }
+ urq->nsg = n_elem;
+ sc->sg_stat[n_elem < 5 ? n_elem : 5]++;
+
if (blk_pc_request(rq)) {
- rc = ub_cmd_build_packet(sc, lun, cmd, rq);
+ ub_cmd_build_packet(sc, lun, cmd, urq);
} else {
- rc = ub_cmd_build_block(sc, lun, cmd, rq);
- }
- if (rc != 0) {
- ub_put_cmd(lun, cmd);
- ub_end_rq(rq, 0);
- return 0;
+ ub_cmd_build_block(sc, lun, cmd, urq);
}
cmd->state = UB_CMDST_INIT;
cmd->lun = lun;
cmd->done = ub_rw_cmd_done;
- cmd->back = rq;
+ cmd->back = urq;
cmd->tag = sc->tagcnt++;
- if (ub_submit_scsi(sc, cmd) != 0) {
- ub_put_cmd(lun, cmd);
- ub_end_rq(rq, 0);
- return 0;
- }
+ if (ub_submit_scsi(sc, cmd) != 0)
+ goto drop;
return 0;
+
+drop:
+ ub_put_cmd(lun, cmd);
+ ub_end_rq(rq, 0);
+ return 0;
}
-static int ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
- struct ub_scsi_cmd *cmd, struct request *rq)
+static void ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
+ struct ub_scsi_cmd *cmd, struct ub_request *urq)
{
- int ub_dir;
- int n_elem;
+ struct request *rq = urq->rq;
unsigned int block, nblks;
if (rq_data_dir(rq) == WRITE)
- ub_dir = UB_DIR_WRITE;
+ cmd->dir = UB_DIR_WRITE;
else
- ub_dir = UB_DIR_READ;
- cmd->dir = ub_dir;
+ cmd->dir = UB_DIR_READ;
- /*
- * get scatterlist from block layer
- */
- n_elem = blk_rq_map_sg(lun->disk->queue, rq, &cmd->sgv[0]);
- if (n_elem <= 0) {
- printk(KERN_INFO "%s: failed request map (%d)\n",
- sc->name, n_elem); /* P3 */
- return -1; /* request with no s/g entries? */
- }
- if (n_elem > UB_MAX_REQ_SG) { /* Paranoia */
- printk(KERN_WARNING "%s: request with %d segments\n",
- sc->name, n_elem);
- return -1;
- }
- cmd->nsg = n_elem;
- sc->sg_stat[n_elem < 5 ? n_elem : 5]++;
+ cmd->nsg = urq->nsg;
+ memcpy(cmd->sgv, urq->sgv, sizeof(struct scatterlist) * cmd->nsg);
/*
* build the command
@@ -847,7 +868,7 @@ static int ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
block = rq->sector >> lun->capacity.bshift;
nblks = rq->nr_sectors >> lun->capacity.bshift;
- cmd->cdb[0] = (ub_dir == UB_DIR_READ)? READ_10: WRITE_10;
+ cmd->cdb[0] = (cmd->dir == UB_DIR_READ)? READ_10: WRITE_10;
/* 10-byte uses 4 bytes of LBA: 2147483648KB, 2097152MB, 2048GB */
cmd->cdb[2] = block >> 24;
cmd->cdb[3] = block >> 16;
@@ -858,14 +879,12 @@ static int ub_cmd_build_block(struct ub_dev *sc, struct ub_lun *lun,
cmd->cdb_len = 10;
cmd->len = rq->nr_sectors * 512;
-
- return 0;
}
-static int ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
- struct ub_scsi_cmd *cmd, struct request *rq)
+static void ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
+ struct ub_scsi_cmd *cmd, struct ub_request *urq)
{
- int n_elem;
+ struct request *rq = urq->rq;
if (rq->data_len == 0) {
cmd->dir = UB_DIR_NONE;
@@ -874,40 +893,26 @@ static int ub_cmd_build_packet(struct ub_dev *sc, struct ub_lun *lun,
cmd->dir = UB_DIR_WRITE;
else
cmd->dir = UB_DIR_READ;
-
}
- /*
- * get scatterlist from block layer
- */
- n_elem = blk_rq_map_sg(lun->disk->queue, rq, &cmd->sgv[0]);
- if (n_elem < 0) {
- printk(KERN_INFO "%s: failed request map (%d)\n",
- sc->name, n_elem); /* P3 */
- return -1;
- }
- if (n_elem > UB_MAX_REQ_SG) { /* Paranoia */
- printk(KERN_WARNING "%s: request with %d segments\n",
- sc->name, n_elem);
- return -1;
- }
- cmd->nsg = n_elem;
- sc->sg_stat[n_elem < 5 ? n_elem : 5]++;
+ cmd->nsg = urq->nsg;
+ memcpy(cmd->sgv, urq->sgv, sizeof(struct scatterlist) * cmd->nsg);
memcpy(&cmd->cdb, rq->cmd, rq->cmd_len);
cmd->cdb_len = rq->cmd_len;
cmd->len = rq->data_len;
-
- return 0;
}
static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
{
- struct request *rq = cmd->back;
struct ub_lun *lun = cmd->lun;
+ struct ub_request *urq = cmd->back;
+ struct request *rq;
int uptodate;
+ rq = urq->rq;
+
if (cmd->error == 0) {
uptodate = 1;
@@ -928,9 +933,16 @@ static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
rq->errors = SAM_STAT_CHECK_CONDITION;
else
rq->errors = DID_ERROR << 16;
+ } else {
+ if (cmd->error == -EIO) {
+ if (ub_rw_cmd_retry(sc, lun, urq, cmd) == 0)
+ return;
+ }
}
}
+ urq->rq = NULL;
+
ub_put_cmd(lun, cmd);
ub_end_rq(rq, uptodate);
blk_start_queue(lun->disk->queue);
@@ -938,11 +950,43 @@ static void ub_rw_cmd_done(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
static void ub_end_rq(struct request *rq, int uptodate)
{
- int rc;
+ end_that_request_first(rq, uptodate, rq->hard_nr_sectors);
+ end_that_request_last(rq, uptodate);
+}
+
+static int ub_rw_cmd_retry(struct ub_dev *sc, struct ub_lun *lun,
+ struct ub_request *urq, struct ub_scsi_cmd *cmd)
+{
+
+ if (atomic_read(&sc->poison))
+ return -ENXIO;
+
+ ub_reset_enter(sc);
- rc = end_that_request_first(rq, uptodate, rq->hard_nr_sectors);
- // assert(rc == 0);
- end_that_request_last(rq);
+ if (urq->current_try >= 3)
+ return -EIO;
+ urq->current_try++;
+ /* P3 */ printk("%s: dir %c len/act %d/%d "
+ "[sense %x %02x %02x] retry %d\n",
+ sc->name, UB_DIR_CHAR(cmd->dir), cmd->len, cmd->act_len,
+ cmd->key, cmd->asc, cmd->ascq, urq->current_try);
+
+ memset(cmd, 0, sizeof(struct ub_scsi_cmd));
+ ub_cmd_build_block(sc, lun, cmd, urq);
+
+ cmd->state = UB_CMDST_INIT;
+ cmd->lun = lun;
+ cmd->done = ub_rw_cmd_done;
+ cmd->back = urq;
+
+ cmd->tag = sc->tagcnt++;
+
+#if 0 /* Wasteful */
+ return ub_submit_scsi(sc, cmd);
+#else
+ ub_cmdq_add(sc, cmd);
+ return 0;
+#endif
}
/*
@@ -1075,7 +1119,7 @@ static void ub_scsi_dispatch(struct ub_dev *sc)
struct ub_scsi_cmd *cmd;
int rc;
- while ((cmd = ub_cmdq_peek(sc)) != NULL) {
+ while (!sc->reset && (cmd = ub_cmdq_peek(sc)) != NULL) {
if (cmd->state == UB_CMDST_DONE) {
ub_cmdq_pop(sc);
(*cmd->done)(sc, cmd);
@@ -1098,11 +1142,12 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
{
struct urb *urb = &sc->work_urb;
struct bulk_cs_wrap *bcs;
+ int len;
int rc;
if (atomic_read(&sc->poison)) {
- /* A little too simplistic, I feel... */
- goto Bad_End;
+ ub_state_done(sc, cmd, -ENODEV);
+ return;
}
if (cmd->state == UB_CMDST_CLEAR) {
@@ -1110,7 +1155,6 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
/*
* STALL while clearning STALL.
* The control pipe clears itself - nothing to do.
- * XXX Might try to reset the device here and retry.
*/
printk(KERN_NOTICE "%s: stall on control pipe\n",
sc->name);
@@ -1129,11 +1173,6 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
} else if (cmd->state == UB_CMDST_CLR2STS) {
if (urb->status == -EPIPE) {
- /*
- * STALL while clearning STALL.
- * The control pipe clears itself - nothing to do.
- * XXX Might try to reset the device here and retry.
- */
printk(KERN_NOTICE "%s: stall on control pipe\n",
sc->name);
goto Bad_End;
@@ -1151,11 +1190,6 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
} else if (cmd->state == UB_CMDST_CLRRS) {
if (urb->status == -EPIPE) {
- /*
- * STALL while clearning STALL.
- * The control pipe clears itself - nothing to do.
- * XXX Might try to reset the device here and retry.
- */
printk(KERN_NOTICE "%s: stall on control pipe\n",
sc->name);
goto Bad_End;
@@ -1172,7 +1206,12 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
ub_state_stat_counted(sc, cmd);
} else if (cmd->state == UB_CMDST_CMD) {
- if (urb->status == -EPIPE) {
+ switch (urb->status) {
+ case 0:
+ break;
+ case -EOVERFLOW:
+ goto Bad_End;
+ case -EPIPE:
rc = ub_submit_clear_stall(sc, cmd, sc->last_pipe);
if (rc != 0) {
printk(KERN_NOTICE "%s: "
@@ -1182,17 +1221,20 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
* This is typically ENOMEM or some other such shit.
* Retrying is pointless. Just do Bad End on it...
*/
- goto Bad_End;
+ ub_state_done(sc, cmd, rc);
+ return;
}
cmd->state = UB_CMDST_CLEAR;
ub_cmdtr_state(sc, cmd);
return;
- }
- if (urb->status != 0) {
+ case -ESHUTDOWN: /* unplug */
+ case -EILSEQ: /* unplug timeout on uhci */
+ ub_state_done(sc, cmd, -ENODEV);
+ return;
+ default:
goto Bad_End;
}
if (urb->actual_length != US_BULK_CB_WRAP_LEN) {
- /* XXX Must do reset here to unconfuse the device */
goto Bad_End;
}
@@ -1211,11 +1253,8 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
printk(KERN_NOTICE "%s: "
"unable to submit clear (%d)\n",
sc->name, rc);
- /*
- * This is typically ENOMEM or some other such shit.
- * Retrying is pointless. Just do Bad End on it...
- */
- goto Bad_End;
+ ub_state_done(sc, cmd, rc);
+ return;
}
cmd->state = UB_CMDST_CLR2STS;
ub_cmdtr_state(sc, cmd);
@@ -1224,14 +1263,50 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
if (urb->status == -EOVERFLOW) {
/*
* A babble? Failure, but we must transfer CSW now.
- * XXX This is going to end in perpetual babble. Reset.
*/
cmd->error = -EOVERFLOW; /* A cheap trick... */
ub_state_stat(sc, cmd);
return;
}
- if (urb->status != 0)
- goto Bad_End;
+
+ if (cmd->dir == UB_DIR_WRITE) {
+ /*
+ * Do not continue writes in case of a failure.
+ * Doing so would cause sectors to be mixed up,
+ * which is worse than sectors lost.
+ *
+ * We must try to read the CSW, or many devices
+ * get confused.
+ */
+ len = urb->actual_length;
+ if (urb->status != 0 ||
+ len != cmd->sgv[cmd->current_sg].length) {
+ cmd->act_len += len;
+ ub_cmdtr_act_len(sc, cmd);
+
+ cmd->error = -EIO;
+ ub_state_stat(sc, cmd);
+ return;
+ }
+
+ } else {
+ /*
+ * If an error occurs on read, we record it, and
+ * continue to fetch data in order to avoid bubble.
+ *
+ * As a small shortcut, we stop if we detect that
+ * a CSW mixed into data.
+ */
+ if (urb->status != 0)
+ cmd->error = -EIO;
+
+ len = urb->actual_length;
+ if (urb->status != 0 ||
+ len != cmd->sgv[cmd->current_sg].length) {
+ if ((len & 0x1FF) == US_BULK_CS_WRAP_LEN)
+ goto Bad_End;
+ }
+ }
cmd->act_len += urb->actual_length;
ub_cmdtr_act_len(sc, cmd);
@@ -1249,11 +1324,8 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
printk(KERN_NOTICE "%s: "
"unable to submit clear (%d)\n",
sc->name, rc);
- /*
- * This is typically ENOMEM or some other such shit.
- * Retrying is pointless. Just do Bad End on it...
- */
- goto Bad_End;
+ ub_state_done(sc, cmd, rc);
+ return;
}
/*
@@ -1266,14 +1338,8 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
ub_cmdtr_state(sc, cmd);
return;
}
- if (urb->status == -EOVERFLOW) {
- /*
- * XXX We are screwed here. Retrying is pointless,
- * because the pipelined data will not get in until
- * we read with a big enough buffer. We must reset XXX.
- */
- goto Bad_End;
- }
+
+ /* Catch everything, including -EOVERFLOW and other nasties. */
if (urb->status != 0)
goto Bad_End;
@@ -1319,15 +1385,15 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
return;
}
- rc = le32_to_cpu(bcs->Residue);
- if (rc != cmd->len - cmd->act_len) {
+ len = le32_to_cpu(bcs->Residue);
+ if (len != cmd->len - cmd->act_len) {
/*
* It is all right to transfer less, the caller has
* to check. But it's not all right if the device
* counts disagree with our counts.
*/
/* P3 */ printk("%s: resid %d len %d act %d\n",
- sc->name, rc, cmd->len, cmd->act_len);
+ sc->name, len, cmd->len, cmd->act_len);
goto Bad_End;
}
@@ -1338,13 +1404,13 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
ub_state_sense(sc, cmd);
return;
case US_BULK_STAT_PHASE:
- /* XXX We must reset the transport here */
/* P3 */ printk("%s: status PHASE\n", sc->name);
goto Bad_End;
default:
printk(KERN_INFO "%s: unknown CSW status 0x%x\n",
sc->name, bcs->Status);
- goto Bad_End;
+ ub_state_done(sc, cmd, -EINVAL);
+ return;
}
/* Not zeroing error to preserve a babble indicator */
@@ -1364,7 +1430,8 @@ static void ub_scsi_urb_compl(struct ub_dev *sc, struct ub_scsi_cmd *cmd)
printk(KERN_WARNING "%s: "
"wrong command state %d\n",
sc->name, cmd->state);
- goto Bad_End;
+ ub_state_done(sc, cmd, -EINVAL);
+ return;
}
return;
@@ -1612,6 +1679,93 @@ static void ub_top_sense_done(struct ub_dev *sc, struct ub_scsi_cmd *scmd)
}
/*
+ * Reset management
+ */
+
+static void ub_reset_enter(struct ub_dev *sc)
+{
+
+ if (sc->reset) {
+ /* This happens often on multi-LUN devices. */
+ return;
+ }
+ sc->reset = 1;
+
+#if 0 /* Not needed because the disconnect waits for us. */
+ unsigned long flags;
+ spin_lock_irqsave(&ub_lock, flags);
+ sc->openc++;
+ spin_unlock_irqrestore(&ub_lock, flags);
+#endif
+
+#if 0 /* We let them stop themselves. */
+ struct list_head *p;
+ struct ub_lun *lun;
+ list_for_each(p, &sc->luns) {
+ lun = list_entry(p, struct ub_lun, link);
+ blk_stop_queue(lun->disk->queue);
+ }
+#endif
+
+ schedule_work(&sc->reset_work);
+}
+
+static void ub_reset_task(void *arg)
+{
+ struct ub_dev *sc = arg;
+ unsigned long flags;
+ struct list_head *p;
+ struct ub_lun *lun;
+ int lkr, rc;
+
+ if (!sc->reset) {
+ printk(KERN_WARNING "%s: Running reset unrequested\n",
+ sc->name);
+ return;
+ }
+
+ if (atomic_read(&sc->poison)) {
+ printk(KERN_NOTICE "%s: Not resetting disconnected device\n",
+ sc->name); /* P3 This floods. Remove soon. XXX */
+ } else if (sc->dev->actconfig->desc.bNumInterfaces != 1) {
+ printk(KERN_NOTICE "%s: Not resetting multi-interface device\n",
+ sc->name); /* P3 This floods. Remove soon. XXX */
+ } else {
+ if ((lkr = usb_lock_device_for_reset(sc->dev, sc->intf)) < 0) {
+ printk(KERN_NOTICE
+ "%s: usb_lock_device_for_reset failed (%d)\n",
+ sc->name, lkr);
+ } else {
+ rc = usb_reset_device(sc->dev);
+ if (rc < 0) {
+ printk(KERN_NOTICE "%s: "
+ "usb_lock_device_for_reset failed (%d)\n",
+ sc->name, rc);
+ }
+
+ if (lkr)
+ usb_unlock_device(sc->dev);
+ }
+ }
+
+ /*
+ * In theory, no commands can be running while reset is active,
+ * so nobody can ask for another reset, and so we do not need any
+ * queues of resets or anything. We do need a spinlock though,
+ * to interact with block layer.
+ */
+ spin_lock_irqsave(&sc->lock, flags);
+ sc->reset = 0;
+ tasklet_schedule(&sc->tasklet);
+ list_for_each(p, &sc->luns) {
+ lun = list_entry(p, struct ub_lun, link);
+ blk_start_queue(lun->disk->queue);
+ }
+ wake_up(&sc->reset_wait);
+ spin_unlock_irqrestore(&sc->lock, flags);
+}
+
+/*
* This is called from a process context.
*/
static void ub_revalidate(struct ub_dev *sc, struct ub_lun *lun)
@@ -2146,7 +2300,7 @@ static int ub_get_pipes(struct ub_dev *sc, struct usb_device *dev,
if (ep_in == NULL || ep_out == NULL) {
printk(KERN_NOTICE "%s: failed endpoint check\n",
sc->name);
- return -EIO;
+ return -ENODEV;
}
/* Calculate and store the pipe values */
@@ -2172,6 +2326,9 @@ static int ub_probe(struct usb_interface *intf,
int rc;
int i;
+ if (usb_usual_check_type(dev_id, USB_US_TYPE_UB))
+ return -ENXIO;
+
rc = -ENOMEM;
if ((sc = kmalloc(sizeof(struct ub_dev), GFP_KERNEL)) == NULL)
goto err_core;
@@ -2181,6 +2338,8 @@ static int ub_probe(struct usb_interface *intf,
usb_init_urb(&sc->work_urb);
tasklet_init(&sc->tasklet, ub_scsi_action, (unsigned long)sc);
atomic_set(&sc->poison, 0);
+ INIT_WORK(&sc->reset_work, ub_reset_task, sc);
+ init_waitqueue_head(&sc->reset_wait);
init_timer(&sc->work_timer);
sc->work_timer.data = (unsigned long) sc;
@@ -2201,7 +2360,8 @@ static int ub_probe(struct usb_interface *intf,
/* XXX Verify that we can handle the device (from descriptors) */
- ub_get_pipes(sc, sc->dev, intf);
+ if (ub_get_pipes(sc, sc->dev, intf) != 0)
+ goto err_dev_desc;
if (device_create_file(&sc->intf->dev, &dev_attr_diag) != 0)
goto err_diag;
@@ -2272,6 +2432,7 @@ static int ub_probe(struct usb_interface *intf,
/* device_remove_file(&sc->intf->dev, &dev_attr_diag); */
err_diag:
+err_dev_desc:
usb_set_intfdata(intf, NULL);
// usb_put_intf(sc->intf);
usb_put_dev(sc->dev);
@@ -2309,14 +2470,14 @@ static int ub_probe_lun(struct ub_dev *sc, int lnum)
ub_revalidate(sc, lun);
rc = -ENOMEM;
- if ((disk = alloc_disk(UB_MINORS_PER_MAJOR)) == NULL)
+ if ((disk = alloc_disk(UB_PARTS_PER_LUN)) == NULL)
goto err_diskalloc;
lun->disk = disk;
sprintf(disk->disk_name, DRV_NAME "%c", lun->id + 'a');
sprintf(disk->devfs_name, DEVFS_NAME "/%c", lun->id + 'a');
disk->major = UB_MAJOR;
- disk->first_minor = lun->id * UB_MINORS_PER_MAJOR;
+ disk->first_minor = lun->id * UB_PARTS_PER_LUN;
disk->fops = &ub_bd_fops;
disk->private_data = lun;
disk->driverfs_dev = &sc->intf->dev;
@@ -2380,6 +2541,11 @@ static void ub_disconnect(struct usb_interface *intf)
atomic_set(&sc->poison, 1);
/*
+ * Wait for reset to end, if any.
+ */
+ wait_event(sc->reset_wait, !sc->reset);
+
+ /*
* Blow away queued commands.
*
* Actually, this never works, because before we get here
@@ -2392,7 +2558,7 @@ static void ub_disconnect(struct usb_interface *intf)
{
struct ub_scsi_cmd *cmd;
int cnt = 0;
- while ((cmd = ub_cmdq_pop(sc)) != NULL) {
+ while ((cmd = ub_cmdq_peek(sc)) != NULL) {
cmd->error = -ENOTCONN;
cmd->state = UB_CMDST_DONE;
ub_cmdtr_state(sc, cmd);
@@ -2461,7 +2627,6 @@ static void ub_disconnect(struct usb_interface *intf)
}
static struct usb_driver ub_driver = {
- .owner = THIS_MODULE,
.name = "ub",
.probe = ub_probe,
.disconnect = ub_disconnect,
@@ -2479,6 +2644,7 @@ static int __init ub_init(void)
if ((rc = usb_register(&ub_driver)) != 0)
goto err_register;
+ usb_usual_set_present(USB_US_TYPE_UB);
return 0;
err_register:
@@ -2494,6 +2660,7 @@ static void __exit ub_exit(void)
devfs_remove(DEVFS_NAME);
unregister_blkdev(UB_MAJOR, DRV_NAME);
+ usb_usual_clear_present(USB_US_TYPE_UB);
}
module_init(ub_init);
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-05 17:26:17 +0000