/* Driver for USB Mass Storage compliant devices
*
- * $Id: transport.c,v 1.47 2002/04/22 03:39:43 mdharm Exp $
- *
* Current development and maintenance by:
* (c) 1999-2002 Matthew Dharm (mdharm-usb@one-eyed-alien.net)
*
*/
#include <linux/sched.h>
+#include <linux/gfp.h>
#include <linux/errno.h>
-#include <linux/slab.h>
+
+#include <linux/usb/quirks.h>
#include <scsi/scsi.h>
#include <scsi/scsi_eh.h>
#include "scsiglue.h"
#include "debug.h"
+#include <linux/blkdev.h>
+#include "../../scsi/sd.h"
+
/***********************************************************************
* Data transfer routines
status = us->current_urb->actual_length;
return status;
}
+EXPORT_SYMBOL_GPL(usb_stor_control_msg);
/* This is a version of usb_clear_halt() that allows early termination and
* doesn't read the status from the device -- this is because some devices
USB_ENDPOINT_HALT, endp,
NULL, 0, 3*HZ);
- /* reset the endpoint toggle */
if (result >= 0)
- usb_settoggle(us->pusb_dev, usb_pipeendpoint(pipe),
- usb_pipeout(pipe), 0);
+ usb_reset_endpoint(us->pusb_dev, endp);
US_DEBUGP("%s: result = %d\n", __func__, result);
return result;
}
+EXPORT_SYMBOL_GPL(usb_stor_clear_halt);
/*
return interpret_urb_result(us, pipe, size, result,
us->current_urb->actual_length);
}
+EXPORT_SYMBOL_GPL(usb_stor_ctrl_transfer);
/*
* Receive one interrupt buffer, without timeouts, but allowing early
return interpret_urb_result(us, pipe, length, result,
us->current_urb->actual_length);
}
+EXPORT_SYMBOL_GPL(usb_stor_bulk_transfer_buf);
/*
* Transfer a scatter-gather list via bulk transfer
scsi_set_resid(srb, scsi_bufflen(srb) - partial);
return result;
}
+EXPORT_SYMBOL_GPL(usb_stor_bulk_srb);
/*
* Transfer an entire SCSI command's worth of data payload over the bulk
*residual = length_left;
return result;
}
+EXPORT_SYMBOL_GPL(usb_stor_bulk_transfer_sg);
/***********************************************************************
* Transport routines
***********************************************************************/
+/* There are so many devices that report the capacity incorrectly,
+ * this routine was written to counteract some of the resulting
+ * problems.
+ */
+static void last_sector_hacks(struct us_data *us, struct scsi_cmnd *srb)
+{
+ struct gendisk *disk;
+ struct scsi_disk *sdkp;
+ u32 sector;
+
+ /* To Report "Medium Error: Record Not Found */
+ static unsigned char record_not_found[18] = {
+ [0] = 0x70, /* current error */
+ [2] = MEDIUM_ERROR, /* = 0x03 */
+ [7] = 0x0a, /* additional length */
+ [12] = 0x14 /* Record Not Found */
+ };
+
+ /* If last-sector problems can't occur, whether because the
+ * capacity was already decremented or because the device is
+ * known to report the correct capacity, then we don't need
+ * to do anything.
+ */
+ if (!us->use_last_sector_hacks)
+ return;
+
+ /* Was this command a READ(10) or a WRITE(10)? */
+ if (srb->cmnd[0] != READ_10 && srb->cmnd[0] != WRITE_10)
+ goto done;
+
+ /* Did this command access the last sector? */
+ sector = (srb->cmnd[2] << 24) | (srb->cmnd[3] << 16) |
+ (srb->cmnd[4] << 8) | (srb->cmnd[5]);
+ disk = srb->request->rq_disk;
+ if (!disk)
+ goto done;
+ sdkp = scsi_disk(disk);
+ if (!sdkp)
+ goto done;
+ if (sector + 1 != sdkp->capacity)
+ goto done;
+
+ if (srb->result == SAM_STAT_GOOD && scsi_get_resid(srb) == 0) {
+
+ /* The command succeeded. We know this device doesn't
+ * have the last-sector bug, so stop checking it.
+ */
+ us->use_last_sector_hacks = 0;
+
+ } else {
+ /* The command failed. Allow up to 3 retries in case this
+ * is some normal sort of failure. After that, assume the
+ * capacity is wrong and we're trying to access the sector
+ * beyond the end. Replace the result code and sense data
+ * with values that will cause the SCSI core to fail the
+ * command immediately, instead of going into an infinite
+ * (or even just a very long) retry loop.
+ */
+ if (++us->last_sector_retries < 3)
+ return;
+ srb->result = SAM_STAT_CHECK_CONDITION;
+ memcpy(srb->sense_buffer, record_not_found,
+ sizeof(record_not_found));
+ }
+
+ done:
+ /* Don't reset the retry counter for TEST UNIT READY commands,
+ * because they get issued after device resets which might be
+ * caused by a failed last-sector access.
+ */
+ if (srb->cmnd[0] != TEST_UNIT_READY)
+ us->last_sector_retries = 0;
+}
+
/* Invoke the transport and basic error-handling/recovery methods
*
* This is used by the protocol layers to actually send the message to
/* if the transport provided its own sense data, don't auto-sense */
if (result == USB_STOR_TRANSPORT_NO_SENSE) {
srb->result = SAM_STAT_CHECK_CONDITION;
+ last_sector_hacks(us, srb);
return;
}
}
/*
+ * Determine if this device is SAT by seeing if the
+ * command executed successfully. Otherwise we'll have
+ * to wait for at least one CHECK_CONDITION to determine
+ * SANE_SENSE support
+ */
+ if (unlikely((srb->cmnd[0] == ATA_16 || srb->cmnd[0] == ATA_12) &&
+ result == USB_STOR_TRANSPORT_GOOD &&
+ !(us->fflags & US_FL_SANE_SENSE) &&
+ !(us->fflags & US_FL_BAD_SENSE) &&
+ !(srb->cmnd[2] & 0x20))) {
+ US_DEBUGP("-- SAT supported, increasing auto-sense\n");
+ us->fflags |= US_FL_SANE_SENSE;
+ }
+
+ /*
* A short transfer on a command where we don't expect it
* is unusual, but it doesn't mean we need to auto-sense.
*/
if (need_auto_sense) {
int temp_result;
struct scsi_eh_save ses;
+ int sense_size = US_SENSE_SIZE;
+ /* device supports and needs bigger sense buffer */
+ if (us->fflags & US_FL_SANE_SENSE)
+ sense_size = ~0;
+Retry_Sense:
US_DEBUGP("Issuing auto-REQUEST_SENSE\n");
- scsi_eh_prep_cmnd(srb, &ses, NULL, 0, US_SENSE_SIZE);
+ scsi_eh_prep_cmnd(srb, &ses, NULL, 0, sense_size);
/* FIXME: we must do the protocol translation here */
if (us->subclass == US_SC_RBC || us->subclass == US_SC_SCSI ||
if (test_bit(US_FLIDX_TIMED_OUT, &us->dflags)) {
US_DEBUGP("-- auto-sense aborted\n");
srb->result = DID_ABORT << 16;
+
+ /* If SANE_SENSE caused this problem, disable it */
+ if (sense_size != US_SENSE_SIZE) {
+ us->fflags &= ~US_FL_SANE_SENSE;
+ us->fflags |= US_FL_BAD_SENSE;
+ }
goto Handle_Errors;
}
+
+ /* Some devices claim to support larger sense but fail when
+ * trying to request it. When a transport failure happens
+ * using US_FS_SANE_SENSE, we always retry with a standard
+ * (small) sense request. This fixes some USB GSM modems
+ */
+ if (temp_result == USB_STOR_TRANSPORT_FAILED &&
+ sense_size != US_SENSE_SIZE) {
+ US_DEBUGP("-- auto-sense failure, retry small sense\n");
+ sense_size = US_SENSE_SIZE;
+ us->fflags &= ~US_FL_SANE_SENSE;
+ us->fflags |= US_FL_BAD_SENSE;
+ goto Retry_Sense;
+ }
+
+ /* Other failures */
if (temp_result != USB_STOR_TRANSPORT_GOOD) {
US_DEBUGP("-- auto-sense failure\n");
return;
}
+ /* If the sense data returned is larger than 18-bytes then we
+ * assume this device supports requesting more in the future.
+ * The response code must be 70h through 73h inclusive.
+ */
+ if (srb->sense_buffer[7] > (US_SENSE_SIZE - 8) &&
+ !(us->fflags & US_FL_SANE_SENSE) &&
+ !(us->fflags & US_FL_BAD_SENSE) &&
+ (srb->sense_buffer[0] & 0x7C) == 0x70) {
+ US_DEBUGP("-- SANE_SENSE support enabled\n");
+ us->fflags |= US_FL_SANE_SENSE;
+
+ /* Indicate to the user that we truncated their sense
+ * because we didn't know it supported larger sense.
+ */
+ US_DEBUGP("-- Sense data truncated to %i from %i\n",
+ US_SENSE_SIZE,
+ srb->sense_buffer[7] + 8);
+ srb->sense_buffer[7] = (US_SENSE_SIZE - 8);
+ }
+
US_DEBUGP("-- Result from auto-sense is %d\n", temp_result);
US_DEBUGP("-- code: 0x%x, key: 0x%x, ASC: 0x%x, ASCQ: 0x%x\n",
srb->sense_buffer[0],
/* set the result so the higher layers expect this data */
srb->result = SAM_STAT_CHECK_CONDITION;
- /* If things are really okay, then let's show that. Zero
- * out the sense buffer so the higher layers won't realize
- * we did an unsolicited auto-sense. */
- if (result == USB_STOR_TRANSPORT_GOOD &&
- /* Filemark 0, ignore EOM, ILI 0, no sense */
+ /* We often get empty sense data. This could indicate that
+ * everything worked or that there was an unspecified
+ * problem. We have to decide which.
+ */
+ if ( /* Filemark 0, ignore EOM, ILI 0, no sense */
(srb->sense_buffer[2] & 0xaf) == 0 &&
/* No ASC or ASCQ */
srb->sense_buffer[12] == 0 &&
srb->sense_buffer[13] == 0) {
- srb->result = SAM_STAT_GOOD;
- srb->sense_buffer[0] = 0x0;
+
+ /* If things are really okay, then let's show that.
+ * Zero out the sense buffer so the higher layers
+ * won't realize we did an unsolicited auto-sense.
+ */
+ if (result == USB_STOR_TRANSPORT_GOOD) {
+ srb->result = SAM_STAT_GOOD;
+ srb->sense_buffer[0] = 0x0;
+
+ /* If there was a problem, report an unspecified
+ * hardware error to prevent the higher layers from
+ * entering an infinite retry loop.
+ */
+ } else {
+ srb->result = DID_ERROR << 16;
+ srb->sense_buffer[2] = HARDWARE_ERROR;
+ }
}
}
/* Did we transfer less than the minimum amount required? */
- if (srb->result == SAM_STAT_GOOD &&
+ if ((srb->result == SAM_STAT_GOOD || srb->sense_buffer[2] == 0) &&
scsi_bufflen(srb) - scsi_get_resid(srb) < srb->underflow)
- srb->result = (DID_ERROR << 16) | (SUGGEST_RETRY << 24);
+ srb->result = DID_ERROR << 16;
+ last_sector_hacks(us, srb);
return;
/* Error and abort processing: try to resynchronize with the device
us->transport_reset(us);
}
clear_bit(US_FLIDX_RESETTING, &us->dflags);
+ last_sector_hacks(us, srb);
}
/* Stop the current URB transfer */
}
/*
- * Control/Bulk/Interrupt transport
+ * Control/Bulk and Control/Bulk/Interrupt transport
*/
-int usb_stor_CBI_transport(struct scsi_cmnd *srb, struct us_data *us)
+int usb_stor_CB_transport(struct scsi_cmnd *srb, struct us_data *us)
{
unsigned int transfer_length = scsi_bufflen(srb);
unsigned int pipe = 0;
}
/* STATUS STAGE */
+
+ /* NOTE: CB does not have a status stage. Silly, I know. So
+ * we have to catch this at a higher level.
+ */
+ if (us->protocol != US_PR_CBI)
+ return USB_STOR_TRANSPORT_GOOD;
+
result = usb_stor_intr_transfer(us, us->iobuf, 2);
US_DEBUGP("Got interrupt data (0x%x, 0x%x)\n",
us->iobuf[0], us->iobuf[1]);
usb_stor_clear_halt(us, pipe);
return USB_STOR_TRANSPORT_FAILED;
}
-
-/*
- * Control/Bulk transport
- */
-int usb_stor_CB_transport(struct scsi_cmnd *srb, struct us_data *us)
-{
- unsigned int transfer_length = scsi_bufflen(srb);
- int result;
-
- /* COMMAND STAGE */
- /* let's send the command via the control pipe */
- result = usb_stor_ctrl_transfer(us, us->send_ctrl_pipe,
- US_CBI_ADSC,
- USB_TYPE_CLASS | USB_RECIP_INTERFACE, 0,
- us->ifnum, srb->cmnd, srb->cmd_len);
-
- /* check the return code for the command */
- US_DEBUGP("Call to usb_stor_ctrl_transfer() returned %d\n", result);
-
- /* if we stalled the command, it means command failed */
- if (result == USB_STOR_XFER_STALLED) {
- return USB_STOR_TRANSPORT_FAILED;
- }
-
- /* Uh oh... serious problem here */
- if (result != USB_STOR_XFER_GOOD) {
- return USB_STOR_TRANSPORT_ERROR;
- }
-
- /* DATA STAGE */
- /* transfer the data payload for this command, if one exists*/
- if (transfer_length) {
- unsigned int pipe = srb->sc_data_direction == DMA_FROM_DEVICE ?
- us->recv_bulk_pipe : us->send_bulk_pipe;
- result = usb_stor_bulk_srb(us, pipe, srb);
- US_DEBUGP("CB data stage result is 0x%x\n", result);
-
- /* if we stalled the data transfer it means command failed */
- if (result == USB_STOR_XFER_STALLED)
- return USB_STOR_TRANSPORT_FAILED;
- if (result > USB_STOR_XFER_STALLED)
- return USB_STOR_TRANSPORT_ERROR;
- }
-
- /* STATUS STAGE */
- /* NOTE: CB does not have a status stage. Silly, I know. So
- * we have to catch this at a higher level.
- */
- return USB_STOR_TRANSPORT_GOOD;
-}
+EXPORT_SYMBOL_GPL(usb_stor_CB_transport);
/*
* Bulk only transport
US_BULK_GET_MAX_LUN,
USB_DIR_IN | USB_TYPE_CLASS |
USB_RECIP_INTERFACE,
- 0, us->ifnum, us->iobuf, 1, HZ);
+ 0, us->ifnum, us->iobuf, 1, 10*HZ);
US_DEBUGP("GetMaxLUN command result is %d, data is %d\n",
result, us->iobuf[0]);
/* try to compute the actual residue, based on how much data
* was really transferred and what the device tells us */
- if (residue) {
- if (!(us->fflags & US_FL_IGNORE_RESIDUE)) {
+ if (residue && !(us->fflags & US_FL_IGNORE_RESIDUE)) {
+
+ /* Heuristically detect devices that generate bogus residues
+ * by seeing what happens with INQUIRY and READ CAPACITY
+ * commands.
+ */
+ if (bcs->Status == US_BULK_STAT_OK &&
+ scsi_get_resid(srb) == 0 &&
+ ((srb->cmnd[0] == INQUIRY &&
+ transfer_length == 36) ||
+ (srb->cmnd[0] == READ_CAPACITY &&
+ transfer_length == 8))) {
+ us->fflags |= US_FL_IGNORE_RESIDUE;
+
+ } else {
residue = min(residue, transfer_length);
scsi_set_resid(srb, max(scsi_get_resid(srb),
(int) residue));
/* we should never get here, but if we do, we're in trouble */
return USB_STOR_TRANSPORT_ERROR;
}
+EXPORT_SYMBOL_GPL(usb_stor_Bulk_transport);
/***********************************************************************
* Reset routines
USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0, us->ifnum, us->iobuf, CB_RESET_CMD_SIZE);
}
+EXPORT_SYMBOL_GPL(usb_stor_CB_reset);
/* This issues a Bulk-only Reset to the device in question, including
* clearing the subsequent endpoint halts that may occur.
USB_TYPE_CLASS | USB_RECIP_INTERFACE,
0, us->ifnum, NULL, 0);
}
+EXPORT_SYMBOL_GPL(usb_stor_Bulk_reset);
/* Issue a USB port reset to the device. The caller must not hold
* us->dev_mutex.
*/
int usb_stor_port_reset(struct us_data *us)
{
- int result, rc_lock;
+ int result;
+
+ /*for these devices we must use the class specific method */
+ if (us->pusb_dev->quirks & USB_QUIRK_RESET_MORPHS)
+ return -EPERM;
- result = rc_lock =
- usb_lock_device_for_reset(us->pusb_dev, us->pusb_intf);
+ result = usb_lock_device_for_reset(us->pusb_dev, us->pusb_intf);
if (result < 0)
US_DEBUGP("unable to lock device for reset: %d\n", result);
else {
result = -EIO;
US_DEBUGP("No reset during disconnect\n");
} else {
- result = usb_reset_composite_device(
- us->pusb_dev, us->pusb_intf);
- US_DEBUGP("usb_reset_composite_device returns %d\n",
+ result = usb_reset_device(us->pusb_dev);
+ US_DEBUGP("usb_reset_device returns %d\n",
result);
}
- if (rc_lock)
- usb_unlock_device(us->pusb_dev);
+ usb_unlock_device(us->pusb_dev);
}
return result;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff