-stable review patch. If anyone has any objections, please let us know. --------------------- From: Borislav Petkov upstream commit: 2eba08270990b99fb5429b76ee97184ddd272f7f 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 Reported-by: Michael Roth Signed-off-by: Bartlomiej Zolnierkiewicz Signed-off-by: Chris Wright --- drivers/ide/ide-atapi.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) --- a/drivers/ide/ide-atapi.c +++ b/drivers/ide/ide-atapi.c @@ -568,6 +568,10 @@ static ide_startstop_t ide_transfer_pc(i : ide_pc_intr), timeout, expiry); + /* 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) @@ -579,10 +583,6 @@ static ide_startstop_t ide_transfer_pc(i } } - /* 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; } -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/