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Subject[patch][6/6] ide: unify PIO code
Date

[patch] ide: unify PIO code

Use PIO code from ide-taskfile.c in ide-disk.c so:
- drive status is checked after PIO read
- request is failed if invalid data phase
is detected during PIO write

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@elka.pw.edu.pl>
---

linux-2.6.9-rc1-bk16-bzolnier/drivers/ide/ide-disk.c | 86 ---------------
linux-2.6.9-rc1-bk16-bzolnier/drivers/ide/ide-taskfile.c | 15 --
linux-2.6.9-rc1-bk16-bzolnier/include/linux/ide.h | 5
3 files changed, 7 insertions(+), 99 deletions(-)

diff -puN drivers/ide/ide-disk.c~ide_pio_unify drivers/ide/ide-disk.c
--- linux-2.6.9-rc1-bk16/drivers/ide/ide-disk.c~ide_pio_unify 2004-09-10 23:50:51.944780112 +0200
+++ linux-2.6.9-rc1-bk16-bzolnier/drivers/ide/ide-disk.c 2004-09-10 23:50:51.955778440 +0200
@@ -123,72 +123,6 @@ static int lba_capacity_is_ok (struct hd
#ifndef CONFIG_IDE_TASKFILE_IO

/*
- * read_intr() is the handler for disk read/multread interrupts
- */
-static ide_startstop_t read_intr (ide_drive_t *drive)
-{
- ide_hwif_t *hwif = HWIF(drive);
- struct request *rq = hwif->hwgroup->rq;
- u8 stat;
-
- /* new way for dealing with premature shared PCI interrupts */
- if (!OK_STAT(stat=hwif->INB(IDE_STATUS_REG),DATA_READY,BAD_R_STAT)) {
- if (stat & (ERR_STAT|DRQ_STAT)) {
- return task_error(drive, rq, __FUNCTION__, stat);
- }
- /* no data yet, so wait for another interrupt */
- ide_set_handler(drive, &read_intr, WAIT_CMD, NULL);
- return ide_started;
- }
-
- if (drive->mult_count)
- ide_pio_multi(drive, 0);
- else
- ide_pio_sector(drive, 0);
- rq->errors = 0;
- if (!hwif->nleft) {
- ide_end_request(drive, 1, hwif->nsect);
- return ide_stopped;
- }
- ide_set_handler(drive, &read_intr, WAIT_CMD, NULL);
- return ide_started;
-}
-
-/*
- * write_intr() is the handler for disk write/multwrite interrupts
- */
-static ide_startstop_t write_intr (ide_drive_t *drive)
-{
- ide_hwgroup_t *hwgroup = HWGROUP(drive);
- ide_hwif_t *hwif = HWIF(drive);
- struct request *rq = hwgroup->rq;
- u8 stat;
-
- if (!OK_STAT(stat = hwif->INB(IDE_STATUS_REG),
- DRIVE_READY, drive->bad_wstat)) {
- printk("%s: write_intr error1: nr_sectors=%u, stat=0x%02x\n",
- drive->name, hwif->nleft, stat);
- } else {
- if ((hwif->nleft == 0) ^ ((stat & DRQ_STAT) != 0)) {
- rq->errors = 0;
- if (!hwif->nleft) {
- ide_end_request(drive, 1, hwif->nsect);
- return ide_stopped;
- }
- if (drive->mult_count)
- ide_pio_multi(drive, 1);
- else
- ide_pio_sector(drive, 1);
- ide_set_handler(drive, &write_intr, WAIT_CMD, NULL);
- return ide_started;
- }
- /* the original code did this here (?) */
- return ide_stopped;
- }
- return task_error(drive, rq, __FUNCTION__, stat);
-}
-
-/*
* __ide_do_rw_disk() issues READ and WRITE commands to a disk,
* using LBA if supported, or CHS otherwise, to address sectors.
* It also takes care of issuing special DRIVE_CMDs.
@@ -299,11 +233,9 @@ ide_startstop_t __ide_do_rw_disk (ide_dr
command = lba48 ? WIN_READ_EXT : WIN_READ;
}

- ide_execute_command(drive, command, &read_intr, WAIT_CMD, NULL);
+ ide_execute_command(drive, command, &task_in_intr, WAIT_CMD, NULL);
return ide_started;
} else {
- ide_startstop_t startstop;
-
if (drive->mult_count) {
hwif->data_phase = TASKFILE_MULTI_OUT;
command = lba48 ? WIN_MULTWRITE_EXT : WIN_MULTWRITE;
@@ -314,21 +246,7 @@ ide_startstop_t __ide_do_rw_disk (ide_dr

hwif->OUTB(command, IDE_COMMAND_REG);

- if (ide_wait_stat(&startstop, drive, DATA_READY,
- drive->bad_wstat, WAIT_DRQ)) {
- printk(KERN_ERR "%s: no DRQ after issuing %s\n",
- drive->name,
- drive->mult_count ? "MULTWRITE" : "WRITE");
- return startstop;
- }
- if (!drive->unmask)
- local_irq_disable();
- ide_set_handler(drive, &write_intr, WAIT_CMD, NULL);
- if (drive->mult_count) {
- ide_pio_multi(drive, 1);
- } else {
- ide_pio_sector(drive, 1);
- }
+ pre_task_out_intr(drive, rq);
return ide_started;
}
}
diff -puN drivers/ide/ide-taskfile.c~ide_pio_unify drivers/ide/ide-taskfile.c
--- linux-2.6.9-rc1-bk16/drivers/ide/ide-taskfile.c~ide_pio_unify 2004-09-10 23:50:51.947779656 +0200
+++ linux-2.6.9-rc1-bk16-bzolnier/drivers/ide/ide-taskfile.c 2004-09-11 00:22:29.168358288 +0200
@@ -301,7 +301,7 @@ static u8 wait_drive_not_busy(ide_drive_
return stat;
}

-void ide_pio_sector(ide_drive_t *drive, unsigned int write)
+static void ide_pio_sector(ide_drive_t *drive, unsigned int write)
{
ide_hwif_t *hwif = drive->hwif;
struct scatterlist *sg = hwif->sg_table;
@@ -338,9 +338,7 @@ void ide_pio_sector(ide_drive_t *drive,
#endif
}

-EXPORT_SYMBOL_GPL(ide_pio_sector);
-
-void ide_pio_multi(ide_drive_t *drive, unsigned int write)
+static void ide_pio_multi(ide_drive_t *drive, unsigned int write)
{
unsigned int nsect;

@@ -349,8 +347,6 @@ void ide_pio_multi(ide_drive_t *drive, u
ide_pio_sector(drive, write);
}

-EXPORT_SYMBOL_GPL(ide_pio_multi);
-
static inline void ide_pio_datablock(ide_drive_t *drive, struct request *rq,
unsigned int write)
{
@@ -368,8 +364,8 @@ static inline void ide_pio_datablock(ide
}
}

-ide_startstop_t task_error(ide_drive_t *drive, struct request *rq,
- const char *s, u8 stat)
+static ide_startstop_t task_error(ide_drive_t *drive, struct request *rq,
+ const char *s, u8 stat)
{
if (rq->bio) {
ide_hwif_t *hwif = drive->hwif;
@@ -399,8 +395,6 @@ ide_startstop_t task_error(ide_drive_t *
return drive->driver->error(drive, s, stat);
}

-EXPORT_SYMBOL_GPL(task_error);
-
static void task_end_request(ide_drive_t *drive, struct request *rq, u8 stat)
{
if (rq->flags & REQ_DRIVE_TASKFILE) {
@@ -424,6 +418,7 @@ ide_startstop_t task_in_intr (ide_drive_
struct request *rq = HWGROUP(drive)->rq;
u8 stat = hwif->INB(IDE_STATUS_REG);

+ /* new way for dealing with premature shared PCI interrupts */
if (!OK_STAT(stat, DATA_READY, BAD_R_STAT)) {
if (stat & (ERR_STAT | DRQ_STAT))
return task_error(drive, rq, __FUNCTION__, stat);
diff -puN include/linux/ide.h~ide_pio_unify include/linux/ide.h
--- linux-2.6.9-rc1-bk16/include/linux/ide.h~ide_pio_unify 2004-09-10 23:52:22.957944008 +0200
+++ linux-2.6.9-rc1-bk16-bzolnier/include/linux/ide.h 2004-09-10 23:52:49.058976048 +0200
@@ -1361,11 +1361,6 @@ extern void atapi_output_bytes(ide_drive
extern void taskfile_input_data(ide_drive_t *, void *, u32);
extern void taskfile_output_data(ide_drive_t *, void *, u32);

-extern void ide_pio_sector(ide_drive_t *, unsigned int);
-extern void ide_pio_multi(ide_drive_t *, unsigned int);
-
-extern ide_startstop_t task_error(ide_drive_t *, struct request *, const char *, u8);
-
extern int drive_is_ready(ide_drive_t *);
extern int wait_for_ready(ide_drive_t *, int /* timeout */);

_
-
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