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ide: add support for arbitrary transfer lengths to ide_pio_bytes() 

Add support for arbitrary transfer lengths to ide_pio_bytes()
and then inline ide_pio_multi() into ide_pio_datablock().

There should be no functional changes caused by this patch.

Cc: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz 2009-03-31 20:14:59 +02:00
parent 2eba082709
commit 7a00798b1a
1 changed files with 37 additions and 36 deletions
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73
drivers/ide/ide-taskfile.c
View File

@ -189,7 +189,7 @@ static u8 wait_drive_not_busy(ide_drive_t *drive)
}
static void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
unsigned int write, unsigned int nr_bytes)
unsigned int write, unsigned int len)
{
ide_hwif_t *hwif = drive->hwif;
struct scatterlist *sg = hwif->sg_table;
@ -202,56 +202,55 @@ static void ide_pio_bytes(ide_drive_t *drive, struct ide_cmd *cmd,
u8 *buf;
cursg = cmd->cursg;
if (!cursg) {
cursg = sg;
cmd->cursg = sg;
}
if (cursg == NULL)
cursg = cmd->cursg = sg;
page = sg_page(cursg);
offset = cursg->offset + cmd->cursg_ofs;
while (len) {
unsigned nr_bytes = min(len, cursg->length - cmd->cursg_ofs);
/* get the current page and offset */
page = nth_page(page, (offset >> PAGE_SHIFT));
offset %= PAGE_SIZE;
if (nr_bytes > PAGE_SIZE)
nr_bytes = PAGE_SIZE;
page = sg_page(cursg);
offset = cursg->offset + cmd->cursg_ofs;
/* get the current page and offset */
page = nth_page(page, (offset >> PAGE_SHIFT));
offset %= PAGE_SIZE;
#ifdef CONFIG_HIGHMEM
local_irq_save(flags);
local_irq_save(flags);
#endif
buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
buf = kmap_atomic(page, KM_BIO_SRC_IRQ) + offset;
cmd->nleft -= nr_bytes;
cmd->cursg_ofs += nr_bytes;
cmd->nleft -= nr_bytes;
cmd->cursg_ofs += nr_bytes;
if (cmd->cursg_ofs == cursg->length) {
cmd->cursg = sg_next(cmd->cursg);
cmd->cursg_ofs = 0;
}
if (cmd->cursg_ofs == cursg->length) {
cursg = cmd->cursg = sg_next(cmd->cursg);
cmd->cursg_ofs = 0;
}
/* do the actual data transfer */
if (write)
hwif->tp_ops->output_data(drive, cmd, buf, nr_bytes);
else
hwif->tp_ops->input_data(drive, cmd, buf, nr_bytes);
/* do the actual data transfer */
if (write)
hwif->tp_ops->output_data(drive, cmd, buf, nr_bytes);
else
hwif->tp_ops->input_data(drive, cmd, buf, nr_bytes);
kunmap_atomic(buf, KM_BIO_SRC_IRQ);
kunmap_atomic(buf, KM_BIO_SRC_IRQ);
#ifdef CONFIG_HIGHMEM
local_irq_restore(flags);
local_irq_restore(flags);
#endif
}
static void ide_pio_multi(ide_drive_t *drive, struct ide_cmd *cmd,
unsigned int write)
{
unsigned int nsect;
nsect = min_t(unsigned int, cmd->nleft >> 9, drive->mult_count);
while (nsect--)
ide_pio_bytes(drive, cmd, write, SECTOR_SIZE);
len -= nr_bytes;
}
}
static void ide_pio_datablock(ide_drive_t *drive, struct ide_cmd *cmd,
unsigned int write)
{
unsigned int nr_bytes;
u8 saved_io_32bit = drive->io_32bit;
if (cmd->tf_flags & IDE_TFLAG_FS)
@ -263,9 +262,11 @@ static void ide_pio_datablock(ide_drive_t *drive, struct ide_cmd *cmd,
touch_softlockup_watchdog();
if (cmd->tf_flags & IDE_TFLAG_MULTI_PIO)
ide_pio_multi(drive, cmd, write);
nr_bytes = min_t(unsigned, cmd->nleft, drive->mult_count << 9);
else
ide_pio_bytes(drive, cmd, write, SECTOR_SIZE);
nr_bytes = SECTOR_SIZE;
ide_pio_bytes(drive, cmd, write, nr_bytes);
drive->io_32bit = saved_io_32bit;
}