Commit b13345f3 authored by Borislav Petkov's avatar Borislav Petkov

ide-atapi: add a buffer-arg to ide_queue_pc_tail

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: 's avatarBorislav Petkov <petkovbb@gmail.com>
parent 5a0e43b5
......@@ -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);
......
......@@ -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 */
......
......@@ -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 &&
......
......@@ -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]);
......
......@@ -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);
......
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