[PATCH 16/22] ide: add pointer to the current packet command to ide_drive_t

From: Bartlomiej Zolnierkiewicz
Date: Sun Aug 10 2008 - 11:43:43 EST

* Add pointer to the current packet command (struct ide_atapi_pc *pc)
to ide_drive_t and use it instead of the pointer in struct ide_*_obj.

* Use drive->pc in ide_{issue,transfer}_pc() and ide_pc_intr()
instead of 'pc' argument.

There should be no functional changes caused by this patch.

Cc: Borislav Petkov <petkovbb@xxxxxxxxx>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@xxxxxxxxx>
---
drivers/ide/ide-atapi.c | 9 ++++---
drivers/ide/ide-floppy.c | 20 ++++++----------
drivers/ide/ide-floppy.h | 2 -
drivers/ide/ide-tape.c | 31 ++++++++-----------------
drivers/scsi/ide-scsi.c | 58 ++++++++++++++++++++++-------------------------
include/linux/ide.h | 10 +++++---
6 files changed, 60 insertions(+), 70 deletions(-)

Index: b/drivers/ide/ide-atapi.c
===================================================================
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -204,12 +204,13 @@ int ide_set_media_lock(ide_drive_t *driv
EXPORT_SYMBOL_GPL(ide_set_media_lock);

/* TODO: unify the code thus making some arguments go away */
-ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc,
+ide_startstop_t ide_pc_intr(ide_drive_t *drive,
ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,
void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),
void (*retry_pc)(ide_drive_t *),
int (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))
{
+ struct ide_atapi_pc *pc = drive->pc;
ide_hwif_t *hwif = drive->hwif;
struct request *rq = hwif->hwgroup->rq;
const struct ide_tp_ops *tp_ops = hwif->tp_ops;
@@ -416,10 +417,11 @@ static u8 ide_wait_ireason(ide_drive_t *
return ireason;
}

-ide_startstop_t ide_transfer_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
+ide_startstop_t ide_transfer_pc(ide_drive_t *drive,
ide_handler_t *handler, unsigned int timeout,
ide_expiry_t *expiry)
{
+ struct ide_atapi_pc *pc = drive->pc;
ide_hwif_t *hwif = drive->hwif;
struct request *rq = hwif->hwgroup->rq;
ide_startstop_t startstop;
@@ -458,10 +460,11 @@ ide_startstop_t ide_transfer_pc(ide_driv
}
EXPORT_SYMBOL_GPL(ide_transfer_pc);

-ide_startstop_t ide_issue_pc(ide_drive_t *drive, struct ide_atapi_pc *pc,
+ide_startstop_t ide_issue_pc(ide_drive_t *drive,
ide_handler_t *handler, unsigned int timeout,
ide_expiry_t *expiry)
{
+ struct ide_atapi_pc *pc = drive->pc;
ide_hwif_t *hwif = drive->hwif;
u16 bcount;
u8 dma = 0;
Index: b/drivers/ide/ide-floppy.c
===================================================================
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -158,7 +158,7 @@ static void idefloppy_update_buffers(ide
static void ide_floppy_callback(ide_drive_t *drive, int dsc)
{
idefloppy_floppy_t *floppy = drive->driver_data;
- struct ide_atapi_pc *pc = floppy->pc;
+ struct ide_atapi_pc *pc = drive->pc;
int uptodate = pc->error ? 0 : 1;

debug_log("Reached %s\n", __func__);
@@ -170,7 +170,7 @@ static void ide_floppy_callback(ide_driv
(pc->rq && blk_pc_request(pc->rq)))
uptodate = 1; /* FIXME */
else if (pc->c[0] == GPCMD_REQUEST_SENSE) {
- u8 *buf = floppy->pc->buf;
+ u8 *buf = pc->buf;

if (!pc->error) {
floppy->sense_key = buf[2] & 0x0F;
@@ -218,9 +218,7 @@ static void idefloppy_retry_pc(ide_drive
/* The usual interrupt handler called during a packet command. */
static ide_startstop_t idefloppy_pc_intr(ide_drive_t *drive)
{
- idefloppy_floppy_t *floppy = drive->driver_data;
-
- return ide_pc_intr(drive, floppy->pc, idefloppy_pc_intr,
+ return ide_pc_intr(drive, idefloppy_pc_intr,
WAIT_FLOPPY_CMD, NULL, idefloppy_update_buffers,
idefloppy_retry_pc, ide_io_buffers);
}
@@ -233,10 +231,8 @@ static ide_startstop_t idefloppy_pc_intr
*/
static int idefloppy_transfer_pc(ide_drive_t *drive)
{
- idefloppy_floppy_t *floppy = drive->driver_data;
-
/* Send the actual packet */
- drive->hwif->tp_ops->output_data(drive, NULL, floppy->pc->c, 12);
+ drive->hwif->tp_ops->output_data(drive, NULL, drive->pc->c, 12);

/* Timeout for the packet command */
return WAIT_FLOPPY_CMD;
@@ -250,7 +246,6 @@ static int idefloppy_transfer_pc(ide_dri
static ide_startstop_t idefloppy_start_pc_transfer(ide_drive_t *drive)
{
idefloppy_floppy_t *floppy = drive->driver_data;
- struct ide_atapi_pc *pc = floppy->pc;
ide_expiry_t *expiry;
unsigned int timeout;

@@ -270,7 +265,7 @@ static ide_startstop_t idefloppy_start_p
expiry = NULL;
}

- return ide_transfer_pc(drive, pc, idefloppy_pc_intr, timeout, expiry);
+ return ide_transfer_pc(drive, idefloppy_pc_intr, timeout, expiry);
}

static void ide_floppy_report_error(idefloppy_floppy_t *floppy,
@@ -297,8 +292,9 @@ static ide_startstop_t idefloppy_issue_p
if (floppy->failed_pc == NULL &&
pc->c[0] != GPCMD_REQUEST_SENSE)
floppy->failed_pc = pc;
+
/* Set the current packet command */
- floppy->pc = pc;
+ drive->pc = pc;

if (pc->retries > IDEFLOPPY_MAX_PC_RETRIES) {
if (!(pc->flags & PC_FLAG_SUPPRESS_ERROR))
@@ -315,7 +311,7 @@ static ide_startstop_t idefloppy_issue_p

pc->retries++;

- return ide_issue_pc(drive, pc, idefloppy_start_pc_transfer,
+ return ide_issue_pc(drive, idefloppy_start_pc_transfer,
WAIT_FLOPPY_CMD, NULL);
}

Index: b/drivers/ide/ide-floppy.h
===================================================================
--- a/drivers/ide/ide-floppy.h
+++ b/drivers/ide/ide-floppy.h
@@ -13,8 +13,6 @@ typedef struct ide_floppy_obj {
struct kref kref;
unsigned int openers; /* protected by BKL for now */

- /* Current packet command */
- struct ide_atapi_pc *pc;
/* Last failed packet command */
struct ide_atapi_pc *failed_pc;
/* used for blk_{fs,pc}_request() requests */
Index: b/drivers/ide/ide-tape.c
===================================================================
--- a/drivers/ide/ide-tape.c
+++ b/drivers/ide/ide-tape.c
@@ -172,15 +172,11 @@ typedef struct ide_tape_obj {
struct kref kref;

/*
- * pc points to the current processed packet command.
- *
* failed_pc points to the last failed packet command, or contains
* NULL if we do not need to retry any packet command. This is
* required since an additional packet command is needed before the
* retry, to get detailed information on what went wrong.
*/
- /* Current packet command */
- struct ide_atapi_pc *pc;
/* Last failed packet command */
struct ide_atapi_pc *failed_pc;
/* used by REQ_IDETAPE_{READ,WRITE} requests */
@@ -527,7 +523,7 @@ static void ide_tape_handle_dsc(ide_driv
static void ide_tape_callback(ide_drive_t *drive, int dsc)
{
idetape_tape_t *tape = drive->driver_data;
- struct ide_atapi_pc *pc = tape->pc;
+ struct ide_atapi_pc *pc = drive->pc;
int uptodate = pc->error ? 0 : 1;

debug_log(DBG_PROCS, "Enter %s\n", __func__);
@@ -563,7 +559,7 @@ static void ide_tape_callback(ide_drive_
if (pc->error)
uptodate = pc->error;
} else if (pc->c[0] == READ_POSITION && uptodate) {
- u8 *readpos = tape->pc->buf;
+ u8 *readpos = pc->buf;

debug_log(DBG_SENSE, "BOP - %s\n",
(readpos[0] & 0x80) ? "Yes" : "No");
@@ -659,9 +655,7 @@ static int ide_tape_io_buffers(ide_drive
*/
static ide_startstop_t idetape_pc_intr(ide_drive_t *drive)
{
- idetape_tape_t *tape = drive->driver_data;
-
- return ide_pc_intr(drive, tape->pc, idetape_pc_intr, WAIT_TAPE_CMD,
+ return ide_pc_intr(drive, idetape_pc_intr, WAIT_TAPE_CMD,
NULL, idetape_update_buffers, idetape_retry_pc,
ide_tape_io_buffers);
}
@@ -669,7 +663,7 @@ static ide_startstop_t idetape_pc_intr(i
/*
* Packet Command Interface
*
- * The current Packet Command is available in tape->pc, and will not change
+ * The current Packet Command is available in drive->pc, and will not change
* until we finish handling it. Each packet command is associated with a
* callback function that will be called when the command is finished.
*
@@ -704,10 +698,7 @@ static ide_startstop_t idetape_pc_intr(i
*/
static ide_startstop_t idetape_transfer_pc(ide_drive_t *drive)
{
- idetape_tape_t *tape = drive->driver_data;
-
- return ide_transfer_pc(drive, tape->pc, idetape_pc_intr,
- WAIT_TAPE_CMD, NULL);
+ return ide_transfer_pc(drive, idetape_pc_intr, WAIT_TAPE_CMD, NULL);
}

static ide_startstop_t idetape_issue_pc(ide_drive_t *drive,
@@ -715,7 +706,7 @@ static ide_startstop_t idetape_issue_pc(
{
idetape_tape_t *tape = drive->driver_data;

- if (tape->pc->c[0] == REQUEST_SENSE &&
+ if (drive->pc->c[0] == REQUEST_SENSE &&
pc->c[0] == REQUEST_SENSE) {
printk(KERN_ERR "ide-tape: possible ide-tape.c bug - "
"Two request sense in serial were issued\n");
@@ -723,8 +714,9 @@ static ide_startstop_t idetape_issue_pc(

if (tape->failed_pc == NULL && pc->c[0] != REQUEST_SENSE)
tape->failed_pc = pc;
+
/* Set the current packet command */
- tape->pc = pc;
+ drive->pc = pc;

if (pc->retries > IDETAPE_MAX_PC_RETRIES ||
(pc->flags & PC_FLAG_ABORT)) {
@@ -755,8 +747,7 @@ static ide_startstop_t idetape_issue_pc(

pc->retries++;

- return ide_issue_pc(drive, pc, idetape_transfer_pc,
- WAIT_TAPE_CMD, NULL);
+ return ide_issue_pc(drive, idetape_transfer_pc, WAIT_TAPE_CMD, NULL);
}

/* A mode sense command is used to "sense" tape parameters. */
@@ -790,7 +781,7 @@ static ide_startstop_t idetape_media_acc
{
ide_hwif_t *hwif = drive->hwif;
idetape_tape_t *tape = drive->driver_data;
- struct ide_atapi_pc *pc = tape->pc;
+ struct ide_atapi_pc *pc = drive->pc;
u8 stat;

stat = hwif->tp_ops->read_status(hwif);
@@ -866,7 +857,7 @@ static ide_startstop_t idetape_do_reques
}

/* Retry a failed packet command */
- if (tape->failed_pc && tape->pc->c[0] == REQUEST_SENSE) {
+ if (tape->failed_pc && drive->pc->c[0] == REQUEST_SENSE) {
pc = tape->failed_pc;
goto out;
}
Index: b/drivers/scsi/ide-scsi.c
===================================================================
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -82,7 +82,6 @@ typedef struct ide_scsi_obj {
struct gendisk *disk;
struct Scsi_Host *host;

- struct ide_atapi_pc *pc; /* Current packet command */
unsigned long transform; /* SCSI cmd translation layer */
unsigned long log; /* log flags */
} idescsi_scsi_t;
@@ -140,7 +139,7 @@ static int idescsi_end_request(ide_drive
static void ide_scsi_callback(ide_drive_t *drive, int dsc)
{
idescsi_scsi_t *scsi = drive_to_idescsi(drive);
- struct ide_atapi_pc *pc = scsi->pc;
+ struct ide_atapi_pc *pc = drive->pc;

if (pc->flags & PC_FLAG_TIMEDOUT)
debug_log("%s: got timed out packet %lu at %lu\n", __func__,
@@ -267,7 +266,7 @@ static int idescsi_end_request (ide_driv
spin_unlock_irqrestore(host->host_lock, flags);
kfree(pc);
blk_put_request(rq);
- scsi->pc = NULL;
+ drive->pc = NULL;
return 0;
}

@@ -278,8 +277,7 @@ static inline unsigned long get_timeout(

static int idescsi_expiry(ide_drive_t *drive)
{
- idescsi_scsi_t *scsi = drive_to_idescsi(drive);
- struct ide_atapi_pc *pc = scsi->pc;
+ struct ide_atapi_pc *pc = drive->pc;

debug_log("%s called for %lu at %lu\n", __func__,
pc->scsi_cmd->serial_number, jiffies);
@@ -294,19 +292,14 @@ static int idescsi_expiry(ide_drive_t *d
*/
static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
{
- idescsi_scsi_t *scsi = drive_to_idescsi(drive);
- struct ide_atapi_pc *pc = scsi->pc;
-
- return ide_pc_intr(drive, pc, idescsi_pc_intr, get_timeout(pc),
+ return ide_pc_intr(drive, idescsi_pc_intr, get_timeout(drive->pc),
idescsi_expiry, NULL, NULL, ide_io_buffers);
}

static ide_startstop_t idescsi_transfer_pc(ide_drive_t *drive)
{
- idescsi_scsi_t *scsi = drive_to_idescsi(drive);
-
- return ide_transfer_pc(drive, scsi->pc, idescsi_pc_intr,
- get_timeout(scsi->pc), idescsi_expiry);
+ return ide_transfer_pc(drive, idescsi_pc_intr,
+ get_timeout(drive->pc), idescsi_expiry);
}

static inline int idescsi_set_direction(struct ide_atapi_pc *pc)
@@ -351,12 +344,10 @@ static int idescsi_map_sg(ide_drive_t *d
static ide_startstop_t idescsi_issue_pc(ide_drive_t *drive,
struct ide_atapi_pc *pc)
{
- idescsi_scsi_t *scsi = drive_to_idescsi(drive);
-
/* Set the current packet command */
- scsi->pc = pc;
+ drive->pc = pc;

- return ide_issue_pc(drive, pc, idescsi_transfer_pc,
+ return ide_issue_pc(drive, idescsi_transfer_pc,
get_timeout(pc), idescsi_expiry);
}

@@ -621,6 +612,8 @@ static int idescsi_eh_abort (struct scsi
int busy;
int ret = FAILED;

+ struct ide_atapi_pc *pc;
+
/* In idescsi_eh_abort we try to gently pry our command from the ide subsystem */

if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
@@ -641,26 +634,27 @@ static int idescsi_eh_abort (struct scsi
spin_lock_irq(&ide_lock);

/* If there is no pc running we're done (our interrupt took care of it) */
- if (!scsi->pc) {
+ pc = drive->pc;
+ if (pc == NULL) {
ret = SUCCESS;
goto ide_unlock;
}

/* It's somewhere in flight. Does ide subsystem agree? */
- if (scsi->pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
- elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != scsi->pc->rq) {
+ if (pc->scsi_cmd->serial_number == cmd->serial_number && !busy &&
+ elv_queue_empty(drive->queue) && HWGROUP(drive)->rq != pc->rq) {
/*
* FIXME - not sure this condition can ever occur
*/
printk (KERN_ERR "ide-scsi: cmd aborted!\n");

- if (blk_sense_request(scsi->pc->rq))
- kfree(scsi->pc->buf);
+ if (blk_sense_request(pc->rq))
+ kfree(pc->buf);
/* we need to call blk_put_request twice. */
- blk_put_request(scsi->pc->rq);
- blk_put_request(scsi->pc->rq);
- kfree(scsi->pc);
- scsi->pc = NULL;
+ blk_put_request(pc->rq);
+ blk_put_request(pc->rq);
+ kfree(pc);
+ drive->pc = NULL;

ret = SUCCESS;
}
@@ -682,6 +676,8 @@ static int idescsi_eh_reset (struct scsi
int ready = 0;
int ret = SUCCESS;

+ struct ide_atapi_pc *pc;
+
/* In idescsi_eh_reset we forcefully remove the command from the ide subsystem and reset the device. */

if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
@@ -696,7 +692,9 @@ static int idescsi_eh_reset (struct scsi
spin_lock_irq(cmd->device->host->host_lock);
spin_lock(&ide_lock);

- if (!scsi->pc || (req = scsi->pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
+ pc = drive->pc;
+
+ if (pc == NULL || (req = pc->rq) != HWGROUP(drive)->rq || !HWGROUP(drive)->handler) {
printk (KERN_WARNING "ide-scsi: No active request in idescsi_eh_reset\n");
spin_unlock(&ide_lock);
spin_unlock_irq(cmd->device->host->host_lock);
@@ -707,9 +705,9 @@ static int idescsi_eh_reset (struct scsi
if (__blk_end_request(req, -EIO, 0))
BUG();
if (blk_sense_request(req))
- kfree(scsi->pc->buf);
- kfree(scsi->pc);
- scsi->pc = NULL;
+ kfree(pc->buf);
+ kfree(pc);
+ drive->pc = NULL;
blk_put_request(req);

/* now nuke the drive queue */
Index: b/include/linux/ide.h
===================================================================
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -321,6 +321,7 @@ typedef enum {
ide_started, /* a drive operation was started, handler was set */
} ide_startstop_t;

+struct ide_atapi_pc;
struct ide_devset;
struct ide_driver_s;

@@ -481,6 +482,9 @@ struct ide_drive_s {
struct device gendev;
struct completion gendev_rel_comp; /* to deal with device release() */

+ /* current packet command */
+ struct ide_atapi_pc *pc;
+
/* callback for packet commands */
void (*pc_callback)(struct ide_drive_s *, int);

@@ -1160,15 +1164,15 @@ int ide_do_test_unit_ready(ide_drive_t *
int ide_do_start_stop(ide_drive_t *, struct gendisk *, int);
int ide_set_media_lock(ide_drive_t *, struct gendisk *, int);

-ide_startstop_t ide_pc_intr(ide_drive_t *drive, struct ide_atapi_pc *pc,
+ide_startstop_t ide_pc_intr(ide_drive_t *drive,
ide_handler_t *handler, unsigned int timeout, ide_expiry_t *expiry,
void (*update_buffers)(ide_drive_t *, struct ide_atapi_pc *),
void (*retry_pc)(ide_drive_t *),
int (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned int,
int));
-ide_startstop_t ide_transfer_pc(ide_drive_t *, struct ide_atapi_pc *,
+ide_startstop_t ide_transfer_pc(ide_drive_t *,
ide_handler_t *, unsigned int, ide_expiry_t *);
-ide_startstop_t ide_issue_pc(ide_drive_t *, struct ide_atapi_pc *,
+ide_startstop_t ide_issue_pc(ide_drive_t *,
ide_handler_t *, unsigned int, ide_expiry_t *);

ide_startstop_t do_rw_taskfile(ide_drive_t *, ide_task_t *);
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