#include "scsiglue.h"
#include "debug.h"
+#include <linux/blkdev.h>
+#include "../../scsi/sd.h"
+
/***********************************************************************
* Data transfer routines
* 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. If the capacity is odd
+ * (i.e., if the sector number is even) then the
+ * "always-even" heuristic would be wrong for this
+ * device. Issue a WARN() so that the kerneloops.org
+ * project will be notified and we will then know to
+ * mark the device with a CAPACITY_OK flag. Hopefully
+ * this will occur for only a few devices.
+ *
+ * Use the sign of us->last_sector_hacks to tell whether
+ * the warning has already been issued; we don't need
+ * more than one warning per device.
+ */
+ if (!(sector & 1) && us->use_last_sector_hacks > 0) {
+ unsigned vid = le16_to_cpu(
+ us->pusb_dev->descriptor.idVendor);
+ unsigned pid = le16_to_cpu(
+ us->pusb_dev->descriptor.idProduct);
+ unsigned rev = le16_to_cpu(
+ us->pusb_dev->descriptor.bcdDevice);
+
+ WARN(1, "%s: Successful last sector success at %u, "
+ "device %04x:%04x:%04x\n",
+ sdkp->disk->disk_name, sector,
+ vid, pid, rev);
+ us->use_last_sector_hacks = -1;
+ }
+
+ } 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));
+
+ /* In theory we might want to issue a WARN() here if the
+ * capacity is even, since it could indicate the device
+ * has the READ CAPACITY bug _and_ the real capacity is
+ * odd. But it could also indicate that the device
+ * simply can't access its last sector, a failure mode
+ * which is surprisingly common. So no warning.
+ */
+ }
+
+ 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;
}
need_auto_sense = 1;
}
+ /*
+ * 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 ((srb->cmnd[0] == ATA_16 || srb->cmnd[0] == ATA_12) &&
+ result == USB_STOR_TRANSPORT_GOOD &&
+ !(us->fflags & US_FL_SANE_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;
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 ||
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) &&
+ (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],
scsi_bufflen(srb) - scsi_get_resid(srb) < srb->underflow)
srb->result = (DID_ERROR << 16) | (SUGGEST_RETRY << 24);
+ 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]);
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;
-}
-
/*
* Bulk only transport
*/
*/
int usb_stor_port_reset(struct us_data *us)
{
- int result, rc_lock;
+ int result;
- 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 {
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;
}
projects / linux-2.6-omap-h63xx.git / blobdiff