[PATCH 2/3] ide-floppy: use ide_pio_bytes()

Borislav Petkov
2009-03-04T09:17:49Z

From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

* Fix ide_init_sg_cmd() setup for non-fs requests.

* Convert ide_pc_intr() to use ide_pio_bytes() for floppy media.

* Remove no longer needed ide_io_buffers() and sg/sg_cnt fields
from struct ide_atapi_pc.

* Remove partial completions; kill idefloppy_update_buffers(), as a
result.

* Add some more debugging statements.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
---
drivers/ide/ide-atapi.c | 68 +++++++++++-----------------------------------
drivers/ide/ide-floppy.c | 24 +++-------------
include/linux/ide.h | 5 ---
3 files changed, 21 insertions(+), 76 deletions(-)

diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index 314e6af..a5596a6 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -69,49 +69,6 @@ int ide_check_atapi_device(ide_drive_t *drive, const char *s)
}
EXPORT_SYMBOL_GPL(ide_check_atapi_device);

-/* PIO data transfer routine using the scatter gather table. */
-int ide_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
- unsigned int bcount, int write)
-{
- ide_hwif_t *hwif = drive->hwif;
- const struct ide_tp_ops *tp_ops = hwif->tp_ops;
- xfer_func_t *xf = write ? tp_ops->output_data : tp_ops->input_data;
- struct scatterlist *sg = pc->sg;
- char *buf;
- int count, done = 0;
-
- while (bcount) {
- count = min(sg->length - pc->b_count, bcount);
-
- if (PageHighMem(sg_page(sg))) {
- unsigned long flags;
-
- local_irq_save(flags);
- buf = kmap_atomic(sg_page(sg), KM_IRQ0) + sg->offset;
- xf(drive, NULL, buf + pc->b_count, count);
- kunmap_atomic(buf - sg->offset, KM_IRQ0);
- local_irq_restore(flags);
- } else {
- buf = sg_virt(sg);
- xf(drive, NULL, buf + pc->b_count, count);
- }
-
- bcount -= count;
- pc->b_count += count;
- done += count;
-
- if (pc->b_count == sg->length) {
- if (!--pc->sg_cnt)
- break;
- pc->sg = sg = sg_next(sg);
- pc->b_count = 0;
- }
- }
-
- return done;
-}
-EXPORT_SYMBOL_GPL(ide_io_buffers);
-
void ide_init_pc(struct ide_atapi_pc *pc)
{
memset(pc, 0, sizeof(*pc));
@@ -339,6 +296,9 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
pc->xferred = pc->req_xfer;
if (drive->pc_update_buffers)
drive->pc_update_buffers(drive, pc);
+
+ if (drive->media == ide_floppy)
+ ide_complete_rq(drive, 0, blk_rq_bytes(rq));
}
debug_log("%s: DMA finished\n", drive->name);
}
@@ -394,12 +354,19 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
rq->errors = 0;
ide_complete_rq(drive, 0, blk_rq_bytes(rq));
} else {
+ unsigned int done;
+
if (blk_fs_request(rq) == 0 && uptodate <= 0) {
if (rq->errors == 0)
rq->errors = -EIO;
}
- ide_complete_rq(drive, uptodate ? 0 : -EIO,
- ide_rq_bytes(rq));
+
+ if (drive->media == ide_tape)
+ done = ide_rq_bytes(rq); /* FIXME */
+ else
+ done = blk_rq_bytes(rq);
+
+ ide_complete_rq(drive, uptodate ? 0 : -EIO, done);
}

return ide_stopped;
@@ -432,14 +399,11 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)

xferfunc = write ? tp_ops->output_data : tp_ops->input_data;

- if ((drive->media == ide_floppy && !pc->buf) ||
- (drive->media == ide_tape && pc->bh)) {
+ if (drive->media == ide_floppy && pc->buf == NULL) {
+ done = min_t(unsigned int, bcount, cmd->nleft);
+ ide_pio_bytes(drive, cmd, write, done);
+ } else if (drive->media == ide_tape && pc->bh) {
done = drive->pc_io_buffers(drive, pc, bcount, write);
-
- /* FIXME: don't do partial completions */
- if (drive->media == ide_floppy)
- ide_complete_rq(drive, 0,
- done ? done : ide_rq_bytes(rq));
} else {
done = min_t(unsigned int, bcount, pc->req_xfer - pc->xferred);
xferfunc(drive, NULL, pc->cur_pos, done);
diff --git a/drivers/ide/ide-floppy.c b/drivers/ide/ide-floppy.c
index 50d918a..2f8f453 100644
--- a/drivers/ide/ide-floppy.c
+++ b/drivers/ide/ide-floppy.c
@@ -61,16 +61,6 @@
*/
#define IDEFLOPPY_PC_DELAY (HZ/20) /* default delay for ZIP 100 (50ms) */

-static void idefloppy_update_buffers(ide_drive_t *drive,
- struct ide_atapi_pc *pc)
-{
- struct request *rq = pc->rq;
- struct bio *bio = rq->bio;
-
- while ((bio = rq->bio) != NULL)
- ide_complete_rq(drive, 0, ide_rq_bytes(rq));
-}
-
static int ide_floppy_callback(ide_drive_t *drive, int dsc)
{
struct ide_disk_obj *floppy = drive->driver_data;
@@ -213,7 +203,6 @@ static void idefloppy_create_rw_cmd(ide_drive_t *drive,
memcpy(rq->cmd, pc->c, 12);

pc->rq = rq;
- pc->b_count = 0;
if (rq->cmd_flags & REQ_RW)
pc->flags |= PC_FLAG_WRITING;
pc->buf = NULL;
@@ -227,7 +216,6 @@ static void idefloppy_blockpc_cmd(struct ide_disk_obj *floppy,
ide_init_pc(pc);
memcpy(pc->c, rq->cmd, sizeof(pc->c));
pc->rq = rq;
- pc->b_count = 0;
if (rq->data_len && rq_data_dir(rq) == WRITE)
pc->flags |= PC_FLAG_WRITING;
pc->buf = rq->data;
@@ -244,10 +232,11 @@ static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,
struct request *rq, sector_t block)
{
struct ide_disk_obj *floppy = drive->driver_data;
- ide_hwif_t *hwif = drive->hwif;
struct ide_cmd cmd;
struct ide_atapi_pc *pc;

+ ide_debug_log(IDE_DBG_FUNC, "enter, cmd: 0x%x\n", rq->cmd[0]);
+
if (drive->debug_mask & IDE_DBG_RQ)
blk_dump_rq_flags(rq, (rq->rq_disk
? rq->rq_disk->disk_name
@@ -293,12 +282,9 @@ static ide_startstop_t ide_floppy_do_request(ide_drive_t *drive,

cmd.rq = rq;

- ide_init_sg_cmd(&cmd, rq->nr_sectors << 9);
+ ide_init_sg_cmd(&cmd, pc->req_xfer);
ide_map_sg(drive, &cmd);

- pc->sg = hwif->sg_table;
- pc->sg_cnt = cmd.sg_nents;
-
pc->rq = rq;

return ide_floppy_issue_pc(drive, &cmd, pc);
@@ -386,6 +372,8 @@ static int ide_floppy_get_capacity(ide_drive_t *drive)
u8 pc_buf[256], header_len, desc_cnt;
int i, rc = 1, blocks, length;

+ ide_debug_log(IDE_DBG_FUNC, "enter");
+
drive->bios_cyl = 0;
drive->bios_head = drive->bios_sect = 0;
floppy->blocks = 0;
@@ -486,8 +474,6 @@ static void ide_floppy_setup(ide_drive_t *drive)
u16 *id = drive->id;

drive->pc_callback = ide_floppy_callback;
- drive->pc_update_buffers = idefloppy_update_buffers;
- drive->pc_io_buffers = ide_io_buffers;

/*
* We used to check revisions here. At this point however I'm giving up.
diff --git a/include/linux/ide.h b/include/linux/ide.h
index e53f820..09bc586 100644
--- a/include/linux/ide.h
+++ b/include/linux/ide.h
@@ -415,9 +415,6 @@ struct ide_atapi_pc {
struct idetape_bh *bh;
char *b_data;

- struct scatterlist *sg;
- unsigned int sg_cnt;
-
unsigned long timeout;
};

@@ -1175,8 +1172,6 @@ void ide_tf_read(ide_drive_t *, struct ide_cmd *);
void ide_input_data(ide_drive_t *, struct ide_cmd *, void *, unsigned int);
void ide_output_data(ide_drive_t *, struct ide_cmd *, void *, unsigned int);

-int ide_io_buffers(ide_drive_t *, struct ide_atapi_pc *, unsigned int, int);
-
extern void SELECT_DRIVE(ide_drive_t *);
void SELECT_MASK(ide_drive_t *, int);

--
1.6.1.3