ide-{floppy,tape}: fix padding for PIO transfers
* 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>
diff --git a/drivers/ide/ide-atapi.c b/drivers/ide/ide-atapi.c
index 3f3fc7c..40f413b 100644
--- a/drivers/ide/ide-atapi.c
+++ b/drivers/ide/ide-atapi.c
@@ -110,13 +110,6 @@
}
}
- 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 @@
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 @@
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 @@
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;
- debug_log("[cmd %x] transferred %d bytes on that intr.\n",
- rq->cmd[0], bcount);
-next_irq:
+ 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);
+
/* And set the interrupt handler again */
ide_set_handler(drive, ide_pc_intr, timeout);
return ide_started;