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ide-atapi: start DMA after issuing a packet command 

Apparently¹, some ATAPI devices want to see the packet command first
before enabling DMA otherwise they simply hang indefinitely. Reorder the
two steps and start DMA only after having issued the command first.

[1] http://marc.info/?l=linux-kernel&m=123835520317235&w=2

Signed-off-by: Borislav Petkov <petkovbb@gmail.com>
Reported-by: Michael Roth <mroth@nessie.de>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
This commit is contained in:
Borislav Petkov 2009-03-31 20:14:58 +02:00 committed by Bartlomiej Zolnierkiewicz
parent da19620d99
commit 2eba082709
1 changed files with 4 additions and 4 deletions
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8
drivers/ide/ide-atapi.c
View File

@ -613,6 +613,10 @@ static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
: ide_pc_intr),
timeout);
/* Send the actual packet */
if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
/* Begin DMA, if necessary */
if (dev_is_idecd(drive)) {
if (drive->dma)
@ -624,10 +628,6 @@ static ide_startstop_t ide_transfer_pc(ide_drive_t *drive)
}
}
/* Send the actual packet */
if ((drive->atapi_flags & IDE_AFLAG_ZIP_DRIVE) == 0)
hwif->tp_ops->output_data(drive, NULL, rq->cmd, cmd_len);
return ide_started;
}