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Commit 6046b3ca authored by Matthew Dharm's avatar Matthew Dharm Committed by Greg Kroah-Hartman
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[PATCH] USB storage: remove usb_stor_tranfer_length() 

This patch removes the (often troublesome) usb_stor_transfer_length()
function.

We've finally gotten all the command initiators to send the correct values
in the srb->request_bufflen field, so this is no longer needed.

There are probably some sanity checks that can also be removed now, but
that's for a later patch.
parent a652bd0f
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Showing with 5 additions and 307 deletions
drivers/usb/storage/freecom.c
View file @ 6046b3ca
......@@ -285,7 +285,7 @@ int freecom_transport(Scsi_Cmnd *srb, struct us_data *us)
* and such will hang. */
US_DEBUGP("Device indicates that it has %d bytes available\n",
le16_to_cpu (fst->Count));
US_DEBUGP("SCSI requested %d\n", usb_stor_transfer_length(srb));
US_DEBUGP("SCSI requested %d\n", srb->request_bufflen);
/* Find the length we desire to read. */
switch (srb->cmnd[0]) {
......@@ -296,7 +296,7 @@ int freecom_transport(Scsi_Cmnd *srb, struct us_data *us)
length = fst->Count;
break;
default:
length = usb_stor_transfer_length (srb);
length = srb->request_bufflen;
}
/* verify that this amount is legal */
......
drivers/usb/storage/transport.c
View file @ 6046b3ca
......@@ -55,307 +55,6 @@
#include <linux/errno.h>
#include <linux/slab.h>
/***********************************************************************
* Helper routines
***********************************************************************/
/* Calculate the length of the data transfer (not the command) for any
* given SCSI command
*/
unsigned int usb_stor_transfer_length(Scsi_Cmnd *srb)
{
int i;
int doDefault = 0;
unsigned int len = 0;
unsigned int total = 0;
struct scatterlist *sg;
/* This table tells us:
X = command not supported
L = return length in cmnd[4] (8 bits).
M = return length in cmnd[8] (8 bits).
G = return length in cmnd[3] and cmnd[4] (16 bits)
H = return length in cmnd[7] and cmnd[8] (16 bits)
I = return length in cmnd[8] and cmnd[9] (16 bits)
C = return length in cmnd[2] to cmnd[5] (32 bits)
D = return length in cmnd[6] to cmnd[9] (32 bits)
B = return length in blocksize so we use buff_len
R = return length in cmnd[2] to cmnd[4] (24 bits)
S = return length in cmnd[3] to cmnd[5] (24 bits)
T = return length in cmnd[6] to cmnd[8] (24 bits)
U = return length in cmnd[7] to cmnd[9] (24 bits)
0-9 = fixed return length
V = 20 bytes
W = 24 bytes
Z = return length is mode dependant or not in command, use buff_len
*/
static char *lengths =
/* 0123456789ABCDEF 0123456789ABCDEF */
"00XLZ6XZBXBBXXXB" "00LBBLG0R0L0GG0X" /* 00-1F */
"XXXXT8XXB4B0BBBB" "ZZZ0B00HCSSZTBHH" /* 20-3F */
"M0HHB0X000H0HH0X" "XHH0HHXX0TH0H0XX" /* 40-5F */
"XXXXXXXXXXXXXXXX" "XXXXXXXXXXXXXXXX" /* 60-7F */
"XXXXXXXXXXXXXXXX" "XXXXXXXXXXXXXXXX" /* 80-9F */
"X0XXX00XB0BXBXBB" "ZZZ0XUIDU000XHBX" /* A0-BF */
"XXXXXXXXXXXXXXXX" "XXXXXXXXXXXXXXXX" /* C0-DF */
"XDXXXXXXXXXXXXXX" "XXW00HXXXXXXXXXX"; /* E0-FF */
/* Commands checked in table:
CHANGE_DEFINITION 40
COMPARE 39
COPY 18
COPY_AND_VERIFY 3a
ERASE 19
ERASE_10 2c
ERASE_12 ac
EXCHANGE_MEDIUM a6
FORMAT_UNIT 04
GET_DATA_BUFFER_STATUS 34
GET_MESSAGE_10 28
GET_MESSAGE_12 a8
GET_WINDOW 25 !!! Has more data than READ_CAPACITY, need to fix table
INITIALIZE_ELEMENT_STATUS 07 !!! REASSIGN_BLOCKS luckily uses buff_len
INQUIRY 12
LOAD_UNLOAD 1b
LOCATE 2b
LOCK_UNLOCK_CACHE 36
LOG_SELECT 4c
LOG_SENSE 4d
MEDIUM_SCAN 38 !!! This was M
MODE_SELECT6 15
MODE_SELECT_10 55
MODE_SENSE_6 1a
MODE_SENSE_10 5a
MOVE_MEDIUM a5
OBJECT_POSITION 31 !!! Same as SEARCH_DATA_EQUAL
PAUSE_RESUME 4b
PLAY_AUDIO_10 45
PLAY_AUDIO_12 a5
PLAY_AUDIO_MSF 47
PLAY_AUDIO_TRACK_INDEX 48
PLAY_AUDIO_TRACK_RELATIVE_10 49
PLAY_AUDIO_TRACK_RELATIVE_12 a9
POSITION_TO_ELEMENT 2b
PRE-FETCH 34
PREVENT_ALLOW_MEDIUM_REMOVAL 1e
PRINT 0a !!! Same as WRITE_6 but is always in bytes
READ_6 08
READ_10 28
READ_12 a8
READ_BLOCK_LIMITS 05
READ_BUFFER 3c
READ_CAPACITY 25
READ_CDROM_CAPACITY 25
READ_DEFECT_DATA 37
READ_DEFECT_DATA_12 b7
READ_ELEMENT_STATUS b8 !!! Think this is in bytes
READ_GENERATION 29 !!! Could also be M?
READ_HEADER 44 !!! This was L
READ_LONG 3e
READ_POSITION 34 !!! This should be V but conflicts with PRE-FETCH
READ_REVERSE 0f
READ_SUB-CHANNEL 42 !!! Is this in bytes?
READ_TOC 43 !!! Is this in bytes?
READ_UPDATED_BLOCK 2d
REASSIGN_BLOCKS 07
RECEIVE 08 !!! Same as READ_6 probably in bytes though
RECEIVE_DIAGNOSTIC_RESULTS 1c
RECOVER_BUFFERED_DATA 14 !!! For PRINTERs this is bytes
RELEASE_UNIT 17
REQUEST_SENSE 03
REQUEST_VOLUME_ELEMENT_ADDRESS b5 !!! Think this is in bytes
RESERVE_UNIT 16
REWIND 01
REZERO_UNIT 01
SCAN 1b !!! Conflicts with various commands, should be L
SEARCH_DATA_EQUAL 31
SEARCH_DATA_EQUAL_12 b1
SEARCH_DATA_LOW 30
SEARCH_DATA_LOW_12 b0
SEARCH_DATA_HIGH 32
SEARCH_DATA_HIGH_12 b2
SEEK_6 0b !!! Conflicts with SLEW_AND_PRINT
SEEK_10 2b
SEND 0a !!! Same as WRITE_6, probably in bytes though
SEND 2a !!! Similar to WRITE_10 but for scanners
SEND_DIAGNOSTIC 1d
SEND_MESSAGE_6 0a !!! Same as WRITE_6 - is in bytes
SEND_MESSAGE_10 2a !!! Same as WRITE_10 - is in bytes
SEND_MESSAGE_12 aa !!! Same as WRITE_12 - is in bytes
SEND_OPC 54
SEND_VOLUME_TAG b6 !!! Think this is in bytes
SET_LIMITS 33
SET_LIMITS_12 b3
SET_WINDOW 24
SLEW_AND_PRINT 0b !!! Conflicts with SEEK_6
SPACE 11
START_STOP_UNIT 1b
STOP_PRINT 1b
SYNCHRONIZE_BUFFER 10
SYNCHRONIZE_CACHE 35
TEST_UNIT_READY 00
UPDATE_BLOCK 3d
VERIFY 13
VERIFY 2f
VERIFY_12 af
WRITE_6 0a
WRITE_10 2a
WRITE_12 aa
WRITE_AND_VERIFY 2e
WRITE_AND_VERIFY_12 ae
WRITE_BUFFER 3b
WRITE_FILEMARKS 10
WRITE_LONG 3f
WRITE_SAME 41
*/
if (srb->sc_data_direction == SCSI_DATA_WRITE) {
doDefault = 1;
}
else
switch (lengths[srb->cmnd[0]]) {
case 'L':
len = srb->cmnd[4];
break;
case 'M':
len = srb->cmnd[8];
break;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
len = lengths[srb->cmnd[0]]-'0';
break;
case 'G':
len = (((unsigned int)srb->cmnd[3])<<8) |
srb->cmnd[4];
break;
case 'H':
len = (((unsigned int)srb->cmnd[7])<<8) |
srb->cmnd[8];
break;
case 'I':
len = (((unsigned int)srb->cmnd[8])<<8) |
srb->cmnd[9];
break;
case 'R':
len = (((unsigned int)srb->cmnd[2])<<16) |
(((unsigned int)srb->cmnd[3])<<8) |
srb->cmnd[4];
break;
case 'S':
len = (((unsigned int)srb->cmnd[3])<<16) |
(((unsigned int)srb->cmnd[4])<<8) |
srb->cmnd[5];
break;
case 'T':
len = (((unsigned int)srb->cmnd[6])<<16) |
(((unsigned int)srb->cmnd[7])<<8) |
srb->cmnd[8];
break;
case 'U':
len = (((unsigned int)srb->cmnd[7])<<16) |
(((unsigned int)srb->cmnd[8])<<8) |
srb->cmnd[9];
break;
case 'C':
len = (((unsigned int)srb->cmnd[2])<<24) |
(((unsigned int)srb->cmnd[3])<<16) |
(((unsigned int)srb->cmnd[4])<<8) |
srb->cmnd[5];
break;
case 'D':
len = (((unsigned int)srb->cmnd[6])<<24) |
(((unsigned int)srb->cmnd[7])<<16) |
(((unsigned int)srb->cmnd[8])<<8) |
srb->cmnd[9];
break;
case 'V':
len = 20;
break;
case 'W':
len = 24;
break;
case 'B':
/* Use buffer size due to different block sizes */
doDefault = 1;
break;
case 'X':
US_DEBUGP("Error: UNSUPPORTED COMMAND %02X\n",
srb->cmnd[0]);
doDefault = 1;
break;
case 'Z':
/* Use buffer size due to mode dependence */
doDefault = 1;
break;
default:
US_DEBUGP("Error: COMMAND %02X out of range or table inconsistent (%c).\n",
srb->cmnd[0], lengths[srb->cmnd[0]] );
doDefault = 1;
}
if ( doDefault == 1 ) {
/* Are we going to scatter gather? */
if (srb->use_sg) {
/* Add up the sizes of all the sg segments */
sg = (struct scatterlist *) srb->request_buffer;
for (i = 0; i < srb->use_sg; i++)
total += sg[i].length;
len = total;
/* Double-check to see if the advertised buffer
* length less than the actual buffer length --
* in other words, we should tend towards the
* conservative side for data transfers.
*/
if (len > srb->request_bufflen)
len = srb->request_bufflen;
}
else
/* Just return the length of the buffer */
len = srb->request_bufflen;
}
/* According to the linux-scsi people, any command sent which
* violates this invariant is a bug. In the hopes of removing
* all the complex logic above, let's find them and eliminate them.
*/
if (len != srb->request_bufflen) {
printk(KERN_ERR "USB len=%d, request_bufflen=%d\n", len, srb->request_bufflen);
dump_stack();
}
return len;
}
/***********************************************************************
* Data transfer routines
***********************************************************************/
......@@ -1031,7 +730,7 @@ void usb_stor_abort_transport(struct us_data *us)
int usb_stor_CBI_transport(Scsi_Cmnd *srb, struct us_data *us)
{
unsigned int transfer_length = usb_stor_transfer_length(srb);
unsigned int transfer_length = srb->request_bufflen;
int result;
/* COMMAND STAGE */
......@@ -1115,7 +814,7 @@ int usb_stor_CBI_transport(Scsi_Cmnd *srb, struct us_data *us)
*/
int usb_stor_CB_transport(Scsi_Cmnd *srb, struct us_data *us)
{
unsigned int transfer_length = usb_stor_transfer_length(srb);
unsigned int transfer_length = srb->request_bufflen;
int result;
/* COMMAND STAGE */
......@@ -1186,7 +885,7 @@ int usb_stor_Bulk_transport(Scsi_Cmnd *srb, struct us_data *us)
{
struct bulk_cb_wrap bcb;
struct bulk_cs_wrap bcs;
unsigned int transfer_length = usb_stor_transfer_length(srb);
unsigned int transfer_length = srb->request_bufflen;
int result;
/* set up the command wrapper */
......
drivers/usb/storage/transport.h
View file @ 6046b3ca
......@@ -154,7 +154,6 @@ extern int usb_stor_Bulk_transport(Scsi_Cmnd*, struct us_data*);
extern int usb_stor_Bulk_max_lun(struct us_data*);
extern int usb_stor_Bulk_reset(struct us_data*);
extern unsigned int usb_stor_transfer_length(Scsi_Cmnd*);
extern void usb_stor_invoke_transport(Scsi_Cmnd*, struct us_data*);
extern void usb_stor_abort_transport(struct us_data*);
......
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