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ide-{floppy,tape}: fix padding for PIO transfers

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* Return number of bytes left to transfer from idetape_{in,out}put_buffers()
  and number of bytes done from ide_tape_io_buffers().

* Fix padding for PIO transfers in ide_pc_intr() so read/write buffers are
  always completely processed and then the transfer is padded if necessary.

* Remove invalid error messages.

* Remove now superfluous padding from ide{_io_buffers,tape_input_buffers}().

While at it:

* Set pc->bh to NULL in idetape_input_buffers() after all bh-s are done.

* Cache !!(pc->flags & PC_FLAG_WRITING) in local variable in ide_pc_intr().

Cc: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Bartlomiej Zolnierkiewicz
2009-03-31 20:15:26 +02:00
parent 9f5af4d667
commit d93bc4521c
2 changed files with 37 additions and 56 deletions
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57
drivers/ide/ide-atapi.c
View File

@@ -110,13 +110,6 @@ int ide_io_buffers(ide_drive_t *drive, struct ide_atapi_pc *pc,
}
}
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);
@@ -330,9 +323,10 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
struct request *rq = hwif->rq;
const struct ide_tp_ops *tp_ops = hwif->tp_ops;
xfer_func_t *xferfunc;
unsigned int timeout, temp;
unsigned int timeout, done;
u16 bcount;
u8 stat, ireason, dsc = 0;
u8 write = !!(pc->flags & PC_FLAG_WRITING);
debug_log("Enter %s - interrupt handler\n", __func__);
@@ -441,8 +435,7 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
return ide_do_reset(drive);
}
if (((ireason & ATAPI_IO) == ATAPI_IO) ==
!!(pc->flags & PC_FLAG_WRITING)) {
if (((ireason & ATAPI_IO) == ATAPI_IO) == write) {
/* Hopefully, we will never get here */
printk(KERN_ERR "%s: We wanted to %s, but the device wants us "
"to %s!\n", drive->name,
@@ -451,45 +444,33 @@ static ide_startstop_t ide_pc_intr(ide_drive_t *drive)
return ide_do_reset(drive);
}
if (!(pc->flags & PC_FLAG_WRITING)) {
/* Reading - Check that we have enough space */
temp = pc->xferred + bcount;
if (temp > pc->req_xfer) {
if (temp > pc->buf_size) {
printk(KERN_ERR "%s: The device wants to send "
"us more data than expected - "
"discarding data\n",
drive->name);
ide_pad_transfer(drive, 0, bcount);
goto next_irq;
}
debug_log("The device wants to send us more data than "
"expected - allowing transfer\n");
}
xferfunc = tp_ops->input_data;
} else
xferfunc = tp_ops->output_data;
xferfunc = write ? tp_ops->output_data : tp_ops->input_data;
if ((drive->media == ide_floppy && !pc->buf) ||
(drive->media == ide_tape && pc->bh)) {
int done = drive->pc_io_buffers(drive, pc, bcount,
!!(pc->flags & PC_FLAG_WRITING));
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
xferfunc(drive, NULL, pc->cur_pos, bcount);
} else {
done = min_t(unsigned int, bcount, pc->req_xfer - pc->xferred);
xferfunc(drive, NULL, pc->cur_pos, done);
}
/* Update the current position */
pc->xferred += bcount;
pc->cur_pos += bcount;
pc->xferred += done;
pc->cur_pos += done;
bcount -= done;
if (bcount)
ide_pad_transfer(drive, write, bcount);
debug_log("[cmd %x] transferred %d bytes, padded %d bytes\n",
rq->cmd[0], done, bcount);
debug_log("[cmd %x] transferred %d bytes on that intr.\n",
rq->cmd[0], bcount);
next_irq:
/* And set the interrupt handler again */
ide_set_handler(drive, ide_pc_intr, timeout);
return ide_started;