diff options
Diffstat (limited to 'drivers/ide/ide-io.c')
| -rw-r--r-- | drivers/ide/ide-io.c | 23 |
1 files changed, 23 insertions, 0 deletions
diff --git a/drivers/ide/ide-io.c b/drivers/ide/ide-io.c index d90cf5d08142..835cf646bb07 100644 --- a/drivers/ide/ide-io.c +++ b/drivers/ide/ide-io.c @@ -887,6 +887,29 @@ static void ide_plug_device(ide_drive_t *drive) spin_unlock_irqrestore(q->queue_lock, flags); } +static int drive_is_ready(ide_drive_t *drive) +{ + ide_hwif_t *hwif = drive->hwif; + u8 stat = 0; + + if (drive->waiting_for_dma) + return hwif->dma_ops->dma_test_irq(drive); + + if (hwif->io_ports.ctl_addr && + (hwif->host_flags & IDE_HFLAG_BROKEN_ALTSTATUS) == 0) + stat = hwif->tp_ops->read_altstatus(hwif); + else + /* Note: this may clear a pending IRQ!! */ + stat = hwif->tp_ops->read_status(hwif); + + if (stat & ATA_BUSY) + /* drive busy: definitely not interrupting */ + return 0; + + /* drive ready: *might* be interrupting */ + return 1; +} + /** * ide_timer_expiry - handle lack of an IDE interrupt * @data: timer callback magic (hwif) |