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Commit 7867bebb authored by Matthew Dharm's avatar Matthew Dharm Committed by Greg Kroah-Hartman
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[PATCH] usb storage: remove duplicate functions 

Once upon a time, the SCSI command structure could only hold a maximum of
12 bytes.  Thus, the ISD-200 driver needed an entirely separate function to
work with 16-byte commands.

Now that 16-bytes is stored, we can cut the duplicates.
parent 0ac962dd
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Showing with 35 additions and 140 deletions
drivers/usb/storage/isd200.c
View file @ 7867bebb
......@@ -130,7 +130,6 @@
#define ISD200_TRANSPORT_GOOD 0 /* Transport good, command good */
#define ISD200_TRANSPORT_FAILED 1 /* Transport good, command failed */
#define ISD200_TRANSPORT_ERROR 2 /* Transport bad (i.e. device dead) */
#define ISD200_TRANSPORT_SHORT 4 /* Transport short */
/* driver action codes */
#define ACTION_READ_STATUS 0
......@@ -393,119 +392,6 @@ void isd200_build_sense(struct us_data *us, Scsi_Cmnd *srb)
***********************************************************************/
/**************************************************************************
* ISD200 Bulk Transport
*
* Note: This routine was copied from the usb_stor_Bulk_transport routine
* located in the transport.c source file. The scsi command is limited to
* only 12 bytes while the CDB for the ISD200 must be 16 bytes.
*/
int isd200_Bulk_transport( struct us_data *us, Scsi_Cmnd *srb,
union ata_cdb *AtaCdb, unsigned char AtaCdbLength )
{
struct bulk_cb_wrap bcb;
struct bulk_cs_wrap bcs;
int result;
unsigned int transfer_length;
int dir = srb->sc_data_direction;
srb->sc_data_direction = SCSI_DATA_WRITE;
transfer_length = usb_stor_transfer_length(srb);
srb->sc_data_direction = dir;
/* set up the command wrapper */
bcb.Signature = cpu_to_le32(US_BULK_CB_SIGN);
bcb.DataTransferLength = cpu_to_le32(transfer_length);
bcb.Flags = srb->sc_data_direction == SCSI_DATA_READ ? 1 << 7 : 0;
bcb.Tag = srb->serial_number;
bcb.Lun = srb->cmnd[1] >> 5;
if (us->flags & US_FL_SCM_MULT_TARG)
bcb.Lun |= srb->target << 4;
bcb.Length = AtaCdbLength;
/* copy the command payload */
memset(bcb.CDB, 0, sizeof(bcb.CDB));
memcpy(bcb.CDB, AtaCdb, bcb.Length);
/* send it to out endpoint */
US_DEBUGP("Bulk command S 0x%x T 0x%x Trg %d LUN %d L %d F %d CL %d\n",
le32_to_cpu(bcb.Signature), bcb.Tag,
(bcb.Lun >> 4), (bcb.Lun & 0x0F),
le32_to_cpu(bcb.DataTransferLength), bcb.Flags, bcb.Length);
result = usb_stor_bulk_transfer_buf(us, us->send_bulk_pipe,
(char *) &bcb, US_BULK_CB_WRAP_LEN, NULL);
US_DEBUGP("Bulk command transfer result=%d\n", result);
if (result != USB_STOR_XFER_GOOD)
return ISD200_TRANSPORT_ERROR;
/* if the command transfered well, then we go to the data stage */
if (transfer_length) {
unsigned int pipe = srb->sc_data_direction == SCSI_DATA_READ ?
us->recv_bulk_pipe : us->send_bulk_pipe;
result = usb_stor_bulk_transfer_srb(us, pipe, srb,
transfer_length);
US_DEBUGP("Bulk data transfer result 0x%x\n", result);
if (result == USB_STOR_XFER_ERROR)
return ISD200_TRANSPORT_ERROR;
}
/* See flow chart on pg 15 of the Bulk Only Transport spec for
* an explanation of how this code works.
*/
/* get CSW for device status */
US_DEBUGP("Attempting to get CSW...\n");
result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
(char *) &bcs, US_BULK_CS_WRAP_LEN, NULL);
/* did the attempt to read the CSW fail? */
if (result == USB_STOR_XFER_STALLED) {
/* get the status again */
US_DEBUGP("Attempting to get CSW (2nd try)...\n");
result = usb_stor_bulk_transfer_buf(us, us->recv_bulk_pipe,
(char *) &bcs, US_BULK_CS_WRAP_LEN, NULL);
}
/* if we still have a failure at this point, we're in trouble */
US_DEBUGP("Bulk status result = %d\n", result);
if (result != USB_STOR_XFER_GOOD)
return ISD200_TRANSPORT_ERROR;
/* check bulk status */
US_DEBUGP("Bulk status Sig 0x%x T 0x%x R %d Stat 0x%x\n",
le32_to_cpu(bcs.Signature), bcs.Tag,
bcs.Residue, bcs.Status);
if (bcs.Signature != cpu_to_le32(US_BULK_CS_SIGN) ||
bcs.Tag != bcb.Tag ||
bcs.Status > US_BULK_STAT_PHASE) {
US_DEBUGP("Bulk logical error\n");
return ISD200_TRANSPORT_ERROR;
}
/* based on the status code, we report good or bad */
switch (bcs.Status) {
case US_BULK_STAT_OK:
/* command good -- note that we could be short on data */
if (srb->resid > 0)
return ISD200_TRANSPORT_SHORT;
return ISD200_TRANSPORT_GOOD;
case US_BULK_STAT_FAIL:
/* command failed */
return ISD200_TRANSPORT_FAILED;
case US_BULK_STAT_PHASE:
/* phase error */
usb_stor_Bulk_reset(us);
return ISD200_TRANSPORT_ERROR;
}
/* we should never get here, but if we do, we're in trouble */
return ISD200_TRANSPORT_ERROR;
}
/**************************************************************************
* isd200_action
*
......@@ -592,9 +478,11 @@ static int isd200_action( struct us_data *us, int action,
break;
}
status = isd200_Bulk_transport(us, &srb, &ata, sizeof(ata.generic));
if (status != ISD200_TRANSPORT_GOOD &&
status != ISD200_TRANSPORT_SHORT) {
memcpy(srb.cmnd, &ata, sizeof(ata.generic));
status = usb_stor_Bulk_transport(&srb, us);
if (status == USB_STOR_TRANSPORT_GOOD)
status = ISD200_GOOD;
else {
US_DEBUGP(" isd200_action(0x%02x) error: %d\n",action,status);
status = ISD200_ERROR;
/* need to reset device here */
......@@ -649,8 +537,8 @@ void isd200_invoke_transport( struct us_data *us,
/* send the command to the transport layer */
srb->resid = 0;
transferStatus = isd200_Bulk_transport(us, srb, ataCdb,
sizeof(ataCdb->generic));
memcpy(srb->cmnd, ataCdb, sizeof(ataCdb->generic));
transferStatus = usb_stor_Bulk_transport(srb, us);
/* if the command gets aborted by the higher layers, we need to
* short-circuit all other processing
......@@ -663,24 +551,31 @@ void isd200_invoke_transport( struct us_data *us,
switch (transferStatus) {
case ISD200_TRANSPORT_GOOD:
case USB_STOR_TRANSPORT_GOOD:
/* Indicate a good result */
srb->result = GOOD << 1;
break;
case ISD200_TRANSPORT_FAILED:
case USB_STOR_TRANSPORT_FAILED:
US_DEBUGP("-- transport indicates command failure\n");
need_auto_sense = 1;
break;
case ISD200_TRANSPORT_ERROR:
US_DEBUGP("-- transport indicates transport failure\n");
case USB_STOR_TRANSPORT_ERROR:
US_DEBUGP("-- transport indicates transport error\n");
srb->result = DID_ERROR << 16;
break;
/* Need reset here */
return;
case ISD200_TRANSPORT_SHORT:
srb->result = GOOD << 1;
if (!((srb->cmnd[0] == REQUEST_SENSE) ||
default:
US_DEBUGP("-- transport indicates unknown error\n");
srb->result = DID_ERROR << 16;
/* Need reset here */
return;
}
if ((srb->resid > 0) &&
!((srb->cmnd[0] == REQUEST_SENSE) ||
(srb->cmnd[0] == INQUIRY) ||
(srb->cmnd[0] == MODE_SENSE) ||
(srb->cmnd[0] == LOG_SENSE) ||
......@@ -688,27 +583,27 @@ void isd200_invoke_transport( struct us_data *us,
US_DEBUGP("-- unexpectedly short transfer\n");
need_auto_sense = 1;
}
break;
default:
US_DEBUGP("-- transport indicates unknown failure\n");
srb->result = DID_ERROR << 16;
}
if (need_auto_sense) {
result = isd200_read_regs(us);
if (atomic_read(&us->sm_state) == US_STATE_ABORTING) {
US_DEBUGP("-- auto-sense aborted\n");
srb->result = DID_ABORT << 16;
} else if (result == ISD200_GOOD)
} else if (result == ISD200_GOOD) {
isd200_build_sense(us, srb);
srb->result = CHECK_CONDITION << 1;
/* If things are really okay, then let's show that */
if ((srb->sense_buffer[2] & 0xf) == 0x0)
srb->result = GOOD << 1;
} else
srb->result = DID_ERROR << 16;
}
/* Regardless of auto-sense, if we _know_ we have an error
* condition, show that in the result code
*/
if (transferStatus == ISD200_TRANSPORT_FAILED)
if (transferStatus == USB_STOR_TRANSPORT_FAILED)
srb->result = CHECK_CONDITION << 1;
}
......
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