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ide: add ide_io_buffers() helper

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* Make ->io_buffers method return number of bytes transferred.

* Use ide_end_request() instead of idefloppy_end_request()
  in ide_floppy_io_buffers() and then move the call out to
  ide_pc_intr().

* Add ide_io_buffers() helper and convert ide-{floppy,scsi}.c
  to use it instead of ide*_io_buffers().

There should be no functional changes caused by this patch.

Acked-by: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz
2008-10-10 22:39:36 +02:00
parent c860f95568
commit acaa0f5f67
5 changed files with 67 additions and 97 deletions
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63
drivers/ide/ide-atapi.c
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@@ -61,12 +61,62 @@ 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;
}
}
if (bcount) {
printk(KERN_ERR "%s: %d leftover bytes, %s\n", drive->name,
bcount, write ? "padding with zeros"
: "discarding data");
ide_pad_transfer(drive, write, bcount);
}
return done;
}
EXPORT_SYMBOL_GPL(ide_io_buffers);
/* 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_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 *), void (*dsc_handle)(ide_drive_t *),
void (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))
int (*io_buffers)(ide_drive_t *, struct ide_atapi_pc *, unsigned, int))
{
ide_hwif_t *hwif = drive->hwif;
struct request *rq = hwif->hwgroup->rq;
@@ -219,9 +269,14 @@ cmd_finished:
if ((drive->media == ide_floppy && !scsi && !pc->buf) ||
(drive->media == ide_tape && !scsi && pc->bh) ||
(scsi && pc->sg))
io_buffers(drive, pc, bcount, !!(pc->flags & PC_FLAG_WRITING));
else
(scsi && pc->sg)) {
int done = io_buffers(drive, pc, bcount,
!!(pc->flags & PC_FLAG_WRITING));
/* FIXME: don't do partial completions */
if (drive->media == ide_floppy && !scsi)
ide_end_request(drive, 1, done >> 9);
} else
xferfunc(drive, NULL, pc->cur_pos, bcount);
/* Update the current position */