[PATCH 05/15] ide-atapi: add a buffer-arg to ide_queue_pc_tail

Borislav Petkov
2009-05-15T05:16:20Z

This is in preparation of removing ide_atapi_pc. Expose the buffer as an
argument to ide_queue_pc_tail with later replacing it with local buffer
or even kmalloc'ed one if needed due to stack usage constraints.

Also, add the possibility of passing a NULL-ptr buffer for cmds which
don't transfer data besides the cdb. While at it, switch to local buffer
in idetape_get_mode_sense_results().

There should be no functional change resulting from this patch.

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
---
drivers/ide/ide-atapi.c | 12 ++++++------
drivers/ide/ide-floppy.c | 17 ++++++++---------
drivers/ide/ide-floppy_ioctl.c | 16 ++++++++--------
drivers/ide/ide-tape.c | 37 ++++++++++++++++++-------------------
include/linux/ide.h | 2 +-
5 files changed, 41 insertions(+), 43 deletions(-)

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index 0d4da2c..b12be1f 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -84,7 +84,7 @@ EXPORT_SYMBOL_GPL(ide_init_pc);
* and wait for it to be serviced.
*/
int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
- struct ide_atapi_pc *pc, unsigned int bufflen)
+ struct ide_atapi_pc *pc, void *buf, unsigned int bufflen)
{
struct request *rq;
int error;
@@ -93,8 +93,8 @@ int ide_queue_pc_tail(ide_drive_t *drive, struct gendisk *disk,
rq->cmd_type = REQ_TYPE_SPECIAL;
rq->special = (char *)pc;

- if (bufflen) {
- error = blk_rq_map_kern(drive->queue, rq, pc->buf, bufflen,
+ if (buf && bufflen) {
+ error = blk_rq_map_kern(drive->queue, rq, buf, bufflen,
GFP_NOIO);
if (error)
goto put_req;
@@ -117,7 +117,7 @@ int ide_do_test_unit_ready(ide_drive_t *drive, struct gendisk *disk)
ide_init_pc(&pc);
pc.c[0] = TEST_UNIT_READY;

- return ide_queue_pc_tail(drive, disk, &pc, 0);
+ return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
}
EXPORT_SYMBOL_GPL(ide_do_test_unit_ready);

@@ -132,7 +132,7 @@ int ide_do_start_stop(ide_drive_t *drive, struct gendisk *disk, int start)
if (drive->media == ide_tape)
pc.flags |= PC_FLAG_WAIT_FOR_DSC;

- return ide_queue_pc_tail(drive, disk, &pc, 0);
+ return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
}
EXPORT_SYMBOL_GPL(ide_do_start_stop);

@@ -147,7 +147,7 @@ int ide_set_media_lock(ide_drive_t *drive, struct gendisk *disk, int on)
pc.c[0] = ALLOW_MEDIUM_REMOVAL;
pc.c[4] = on;

- return ide_queue_pc_tail(drive, disk, &pc, 0);
+ return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
}
EXPORT_SYMBOL_GPL(ide_set_media_lock);

diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 5df00d4..be21cf2 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -318,7 +318,7 @@ static int ide_floppy_get_flexible_disk_page(ide_drive_t *drive,

ide_floppy_create_mode_sense_cmd(pc, IDEFLOPPY_FLEXIBLE_DISK_PAGE);

- if (ide_queue_pc_tail(drive, disk, pc, pc->req_xfer)) {
+ if (ide_queue_pc_tail(drive, disk, pc, pc->buf, pc->req_xfer)) {
printk(KERN_ERR PFX "Can't get flexible disk page params\n");
return 1;
}
@@ -387,22 +387,21 @@ static int ide_floppy_get_capacity(ide_drive_t *drive)
drive->capacity64 = 0;

ide_floppy_create_read_capacity_cmd(&pc);
- pc.buf = &pc_buf[0];
pc.buf_size = sizeof(pc_buf);

- if (ide_queue_pc_tail(drive, disk, &pc, pc.req_xfer)) {
+ if (ide_queue_pc_tail(drive, disk, &pc, pc_buf, pc.req_xfer)) {
printk(KERN_ERR PFX "Can't get floppy parameters\n");
return 1;
}
- header_len = pc.buf[3];
- cap_desc = &pc.buf[4];
+ header_len = pc_buf[3];
+ cap_desc = &pc_buf[4];
desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */

for (i = 0; i < desc_cnt; i++) {
unsigned int desc_start = 4 + i*8;

- blocks = be32_to_cpup((__be32 *)&pc.buf[desc_start]);
- length = be16_to_cpup((__be16 *)&pc.buf[desc_start + 6]);
+ blocks = be32_to_cpup((__be32 *)&pc_buf[desc_start]);
+ length = be16_to_cpup((__be16 *)&pc_buf[desc_start + 6]);

ide_debug_log(IDE_DBG_PROBE, "Descriptor %d: %dkB, %d blocks, "
"%d sector size",
@@ -415,7 +414,7 @@ static int ide_floppy_get_capacity(ide_drive_t *drive)
* the code below is valid only for the 1st descriptor, ie i=0
*/

- switch (pc.buf[desc_start + 4] & 0x03) {
+ switch (pc_buf[desc_start + 4] & 0x03) {
/* Clik! drive returns this instead of CAPACITY_CURRENT */
case CAPACITY_UNFORMATTED:
if (!(drive->atapi_flags & IDE_AFLAG_CLIK_DRIVE))
@@ -464,7 +463,7 @@ static int ide_floppy_get_capacity(ide_drive_t *drive)
break;
}
ide_debug_log(IDE_DBG_PROBE, "Descriptor 0 Code: %d",
- pc.buf[desc_start + 4] & 0x03);
+ pc_buf[desc_start + 4] & 0x03);
}

/* Clik! disk does not support get_flexible_disk_page */
diff --git a/drivers/ide/ide-floppy_ioctl.c b/drivers/ide/ide-floppy_ioctl.c
index 75f1d50..9c2518d 100644
--- a/drivers/ide/ide-floppy_ioctl.c
+++ b/drivers/ide/ide-floppy_ioctl.c
@@ -47,15 +47,14 @@ static int ide_floppy_get_format_capacities(ide_drive_t *drive,
return -EINVAL;

ide_floppy_create_read_capacity_cmd(pc);
- pc->buf = &pc_buf[0];
pc->buf_size = sizeof(pc_buf);

- if (ide_queue_pc_tail(drive, floppy->disk, pc, pc->req_xfer)) {
+ if (ide_queue_pc_tail(drive, floppy->disk, pc, pc_buf, pc->req_xfer)) {
printk(KERN_ERR "ide-floppy: Can't get floppy parameters\n");
return -EIO;
}

- header_len = pc->buf[3];
+ header_len = pc_buf[3];
desc_cnt = header_len / 8; /* capacity descriptor of 8 bytes */

u_index = 0;
@@ -72,8 +71,8 @@ static int ide_floppy_get_format_capacities(ide_drive_t *drive,
if (u_index >= u_array_size)
break; /* User-supplied buffer too small */

- blocks = be32_to_cpup((__be32 *)&pc->buf[desc_start]);
- length = be16_to_cpup((__be16 *)&pc->buf[desc_start + 6]);
+ blocks = be32_to_cpup((__be32 *)&pc_buf[desc_start]);
+ length = be16_to_cpup((__be16 *)&pc_buf[desc_start + 6]);

if (put_user(blocks, argp))
return -EFAULT;
@@ -124,7 +123,7 @@ static int ide_floppy_get_sfrp_bit(ide_drive_t *drive, struct ide_atapi_pc *pc)
ide_floppy_create_mode_sense_cmd(pc, IDEFLOPPY_CAPABILITIES_PAGE);
pc->flags |= PC_FLAG_SUPPRESS_ERROR;

- if (ide_queue_pc_tail(drive, floppy->disk, pc, pc->req_xfer))
+ if (ide_queue_pc_tail(drive, floppy->disk, pc, pc->buf, pc->req_xfer))
return 1;

if (pc->buf[8 + 2] & 0x40)
@@ -172,7 +171,7 @@ static int ide_floppy_format_unit(ide_drive_t *drive, struct ide_atapi_pc *pc,
ide_floppy_get_sfrp_bit(drive, pc);
ide_floppy_create_format_unit_cmd(pc, blocks, length, flags);

- if (ide_queue_pc_tail(drive, floppy->disk, pc, pc->req_xfer))
+ if (ide_queue_pc_tail(drive, floppy->disk, pc, pc->buf, pc->req_xfer))
err = -EIO;

out:
@@ -200,7 +199,8 @@ static int ide_floppy_get_format_progress(ide_drive_t *drive,

if (drive->atapi_flags & IDE_AFLAG_SRFP) {
ide_create_request_sense_cmd(drive, pc);
- if (ide_queue_pc_tail(drive, floppy->disk, pc, pc->req_xfer))
+ if (ide_queue_pc_tail(drive, floppy->disk, pc, pc->buf,
+ pc->req_xfer))
return -EIO;

if (floppy->sense_key == 2 &&
diff --git a/drivers/ide/ide-tape.c b/drivers/ide/ide-tape.c
index f09a263..1f7f504 100644
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -770,7 +770,7 @@ static int idetape_flush_tape_buffers(ide_drive_t *drive)
int rc;

idetape_create_write_filemark_cmd(drive, &pc, 0);
- rc = ide_queue_pc_tail(drive, tape->disk, &pc, pc.req_xfer);
+ rc = ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0);
if (rc)
return rc;
idetape_wait_ready(drive, 60 * 5 * HZ);
@@ -793,7 +793,7 @@ static int idetape_read_position(ide_drive_t *drive)
debug_log(DBG_PROCS, "Enter %s\n", __func__);

idetape_create_read_position_cmd(&pc);
- if (ide_queue_pc_tail(drive, tape->disk, &pc, pc.req_xfer))
+ if (ide_queue_pc_tail(drive, tape->disk, &pc, pc.buf, pc.req_xfer))
return -1;
position = tape->first_frame;
return position;
@@ -846,12 +846,12 @@ static int idetape_position_tape(ide_drive_t *drive, unsigned int block,
__ide_tape_discard_merge_buffer(drive);
idetape_wait_ready(drive, 60 * 5 * HZ);
idetape_create_locate_cmd(drive, &pc, block, partition, skip);
- retval = ide_queue_pc_tail(drive, disk, &pc, pc.req_xfer);
+ retval = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
if (retval)
return (retval);

idetape_create_read_position_cmd(&pc);
- return ide_queue_pc_tail(drive, disk, &pc, pc.req_xfer);
+ return ide_queue_pc_tail(drive, disk, &pc, pc.buf, pc.req_xfer);
}

static void ide_tape_discard_merge_buffer(ide_drive_t *drive,
@@ -1047,12 +1047,12 @@ static int idetape_rewind_tape(ide_drive_t *drive)
debug_log(DBG_SENSE, "Enter %s\n", __func__);

idetape_create_rewind_cmd(drive, &pc);
- retval = ide_queue_pc_tail(drive, disk, &pc, pc.req_xfer);
+ retval = ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
if (retval)
return retval;

idetape_create_read_position_cmd(&pc);
- retval = ide_queue_pc_tail(drive, disk, &pc, pc.req_xfer);
+ retval = ide_queue_pc_tail(drive, disk, &pc, pc.buf, pc.req_xfer);
if (retval)
return retval;
return 0;
@@ -1120,7 +1120,7 @@ static int idetape_space_over_filemarks(ide_drive_t *drive, short mt_op,
case MTBSF:
idetape_create_space_cmd(&pc, mt_count - count,
IDETAPE_SPACE_OVER_FILEMARK);
- return ide_queue_pc_tail(drive, disk, &pc, pc.req_xfer);
+ return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
case MTFSFM:
case MTBSFM:
if (!sprev)
@@ -1259,7 +1259,7 @@ static int idetape_write_filemark(ide_drive_t *drive)

/* Write a filemark */
idetape_create_write_filemark_cmd(drive, &pc, 1);
- if (ide_queue_pc_tail(drive, tape->disk, &pc, pc.req_xfer)) {
+ if (ide_queue_pc_tail(drive, tape->disk, &pc, NULL, 0)) {
printk(KERN_ERR "ide-tape: Couldn't write a filemark\n");
return -EIO;
}
@@ -1344,11 +1344,11 @@ static int idetape_mtioctop(ide_drive_t *drive, short mt_op, int mt_count)
IDETAPE_LU_RETENSION_MASK | IDETAPE_LU_LOAD_MASK);
case MTEOM:
idetape_create_space_cmd(&pc, 0, IDETAPE_SPACE_TO_EOD);
- return ide_queue_pc_tail(drive, disk, &pc, pc.req_xfer);
+ return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
case MTERASE:
(void)idetape_rewind_tape(drive);
idetape_create_erase_cmd(&pc);
- return ide_queue_pc_tail(drive, disk, &pc, pc.req_xfer);
+ return ide_queue_pc_tail(drive, disk, &pc, NULL, 0);
case MTSETBLK:
if (mt_count) {
if (mt_count < tape->blk_size ||
@@ -1457,7 +1457,7 @@ static void ide_tape_get_bsize_from_bdesc(ide_drive_t *drive)
struct ide_atapi_pc pc;

idetape_create_mode_sense_cmd(&pc, IDETAPE_BLOCK_DESCRIPTOR);
- if (ide_queue_pc_tail(drive, tape->disk, &pc, pc.req_xfer)) {
+ if (ide_queue_pc_tail(drive, tape->disk, &pc, pc.buf, pc.req_xfer)) {
printk(KERN_ERR "ide-tape: Can't get block descriptor\n");
if (tape->blk_size == 0) {
printk(KERN_WARNING "ide-tape: Cannot deal with zero "
@@ -1610,17 +1610,16 @@ static void idetape_get_inquiry_results(ide_drive_t *drive)
char fw_rev[4], vendor_id[8], product_id[16];

idetape_create_inquiry_cmd(&pc);
- pc.buf = &pc_buf[0];
pc.buf_size = sizeof(pc_buf);

- if (ide_queue_pc_tail(drive, tape->disk, &pc, pc.req_xfer)) {
+ if (ide_queue_pc_tail(drive, tape->disk, &pc, pc_buf, pc.req_xfer)) {
printk(KERN_ERR "ide-tape: %s: can't get INQUIRY results\n",
tape->name);
return;
}
- memcpy(vendor_id, &pc.buf[8], 8);
- memcpy(product_id, &pc.buf[16], 16);
- memcpy(fw_rev, &pc.buf[32], 4);
+ memcpy(vendor_id, &pc_buf[8], 8);
+ memcpy(product_id, &pc_buf[16], 16);
+ memcpy(fw_rev, &pc_buf[32], 4);

ide_fixstring(vendor_id, 8, 0);
ide_fixstring(product_id, 16, 0);
@@ -1638,11 +1637,11 @@ static void idetape_get_mode_sense_results(ide_drive_t *drive)
{
idetape_tape_t *tape = drive->driver_data;
struct ide_atapi_pc pc;
- u8 *caps;
+ u8 buf[24], *caps;
u8 speed, max_speed;

idetape_create_mode_sense_cmd(&pc, IDETAPE_CAPABILITIES_PAGE);
- if (ide_queue_pc_tail(drive, tape->disk, &pc, pc.req_xfer)) {
+ if (ide_queue_pc_tail(drive, tape->disk, &pc, buf, pc.req_xfer)) {
printk(KERN_ERR "ide-tape: Can't get tape parameters - assuming"
" some default values\n");
tape->blk_size = 512;
@@ -1651,7 +1650,7 @@ static void idetape_get_mode_sense_results(ide_drive_t *drive)
put_unaligned(6*52, (u16 *)&tape->caps[16]);
return;
}
- caps = pc.buf + 4 + pc.buf[3];
+ caps = buf + 4 + buf[3];

/* convert to host order and save for later use */
speed = be16_to_cpup((__be16 *)&caps[14]);
diff --git a/include/linux/ide.h b/include/linux/ide.h
index 7e15bd1..4cd7157 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -1161,7 +1161,7 @@ enum {
};

int ide_queue_pc_tail(ide_drive_t *, struct gendisk *, struct ide_atapi_pc *,
- unsigned int);
+ void *, unsigned int);

int ide_do_test_unit_ready(ide_drive_t *, struct gendisk *);
int ide_do_start_stop(ide_drive_t *, struct gendisk *, int);
--
1.6.3