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Date: Sat, 12 Jan 2002 11:07:16 -0800 (PST)
From: Andre Hedrick <andre@linuxdiskcert.org>
To: Jens Axboe <axboe@suse.de>, linux-kernel@vger.kernel.org
Subject: BIO Usage Error or Conflicting Designs
In-Reply-To: <200201121828.g0CISaM342258@saturn.cs.uml.edu>
Message-ID: <Pine.LNX.4.10.10201121040040.13034-200000@master.linux-ide.org>
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Jens,

Below is a single sector read using ACB.
If I do not use the code inside "#ifdef USEBIO" and run UP/SMP but no
highmem, it runs and works like a charm.  It is also 100% unchanged code
from what is in 2.4 patches.  The attached oops is generate under
SMP without highmem and running the USEBIO code.

CONFIG_NOHIGHMEM=y
# CONFIG_HIGHMEM4G is not set
# CONFIG_HIGHMEM64G is not set

Regards,

Andre Hedrick
Linux Disk Certification Project                Linux ATA Development


/*
 * Handler for command with PIO data-in phase
 */
ide_startstop_t task_in_intr (ide_drive_t *drive)
{
  byte stat               = GET_STAT();
  byte io_32bit           = drive->io_32bit;
  struct request *rq      = HWGROUP(drive)->rq;
  char *pBuf              = NULL;

  if (!OK_STAT(stat,DATA_READY,BAD_R_STAT)) {
    if (stat & (ERR_STAT|DRQ_STAT)) {
      return ide_error(drive, "task_in_intr", stat);
    }
    if (!(stat & BUSY_STAT)) {
      DTF("task_in_intr to Soon wait for next interrupt\n");
      ide_set_handler(drive, &task_in_intr, WAIT_CMD, NULL);
      return ide_started;
    }
  }
  drive->io_32bit = 0;
  DTF("stat: %02x\n", stat);
#ifdef USEBIO
  if (rq->flags & REQ_CMD) {
    pBuf = ide_map_buffer(rq, &flags);
  } else {
    pBuf = rq->buffer + ((rq->nr_sectors - rq->current_nr_sectors) * SECTOR_SIZE);
  }
#else
  pBuf = rq->buffer + ((rq->nr_sectors - rq->current_nr_sectors) * SECTOR_SIZE);
#endif
  DTF("Read: %p, rq->current_nr_sectors: %d\n", pBuf, (int) rq->current_nr_sectors);
  taskfile_input_data(drive, pBuf, SECTOR_WORDS);
#ifdef USEBIO
  if (rq->flags & REQ_CMD)
    ide_unmap_buffer(pBuf, &flags);
  rq->sector++;
  rq->errors = 0;
#endif
  drive->io_32bit = io_32bit;
  if (--rq->current_nr_sectors <= 0) {
    /* (hs): swapped next 2 lines */
    DTF("Request Ended stat: %02x\n", GET_STAT());
    ide_end_request(1, HWGROUP(drive));
  } else {
    ide_set_handler(drive, &task_in_intr,  WAIT_CMD, NULL);
    return ide_started;
  }
  return ide_stopped;
}


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