diff options
| -rw-r--r-- | drivers/ide/ide-taskfile.c | 36 |
1 files changed, 27 insertions, 9 deletions
diff --git a/drivers/ide/ide-taskfile.c b/drivers/ide/ide-taskfile.c index 0518a2e948cf..4c86a8d84b4c 100644 --- a/drivers/ide/ide-taskfile.c +++ b/drivers/ide/ide-taskfile.c @@ -423,6 +423,25 @@ void task_end_request(ide_drive_t *drive, struct request *rq, u8 stat) } /* + * We got an interrupt on a task_in case, but no errors and no DRQ. + * + * It might be a spurious irq (shared irq), but it might be a + * command that had no output. + */ +static ide_startstop_t task_in_unexpected(ide_drive_t *drive, struct request *rq, u8 stat) +{ + /* Command all done? */ + if (OK_STAT(stat, READY_STAT, BUSY_STAT)) { + task_end_request(drive, rq, stat); + return ide_stopped; + } + + /* Assume it was a spurious irq */ + ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL); + return ide_started; +} + +/* * Handler for command with PIO data-in phase (Read/Read Multiple). */ static ide_startstop_t task_in_intr(ide_drive_t *drive) @@ -431,18 +450,17 @@ static ide_startstop_t task_in_intr(ide_drive_t *drive) struct request *rq = HWGROUP(drive)->rq; u8 stat = ide_read_status(drive); - /* new way for dealing with premature shared PCI interrupts */ - if (!OK_STAT(stat, DRQ_STAT, BAD_R_STAT)) { - if (stat & (ERR_STAT | DRQ_STAT)) - return task_error(drive, rq, __FUNCTION__, stat); - /* No data yet, so wait for another IRQ. */ - ide_set_handler(drive, &task_in_intr, WAIT_WORSTCASE, NULL); - return ide_started; - } + /* Error? */ + if (stat & ERR_STAT) + return task_error(drive, rq, __FUNCTION__, stat); + + /* Didn't want any data? Odd. */ + if (!(stat & DRQ_STAT)) + return task_in_unexpected(drive, rq, stat); ide_pio_datablock(drive, rq, 0); - /* If it was the last datablock check status and finish transfer. */ + /* Are we done? Check status and finish transfer. */ if (!hwif->nleft) { stat = wait_drive_not_busy(drive); if (!OK_STAT(stat, 0, BAD_STAT)) |
