Hi Bart,
On Sun, Dec 21, 2008 at 08:05:56PM +0100, Bartlomiej Zolnierkiewicz wrote:
[.. ]
> > don't do cdrom_decode_status for DRQ_INTERRUPT devices but this is
> > probably not that relevant anymore since we busy-wait for DRQ to get set
> > through ide_wait_stat, as we talked about it before - it being a bugfix for
> > all atapi devices. If there's still interest for that (and I think it
>
> Yes, this change is OK but for bisectability reasons it would be better
> to do it in pre-patch (which would fix ide-cd.c accordingly).
>
> [ The other changes in functionality are small and acceptable for this
> patch (i.e. ide_wait_stat() prints error message now) except the change
> of the ordering between ->dma_start and ->output_data calls -- which
> also seems to deserve patch on its own. ]
sorry for the delay but you know how it is, Christmas and all. Anyway,
here are the patches attached as you requested, just in time for the
merge window.
--
From: Borislav Petkov <petkovbb@xxxxxxxxx>
Date: Thu, 25 Dec 2008 18:12:34 +0100
Subject: [PATCH 09/11] ide-cd: wait for DRQ to get set per default
... instead of assuming it is set for accelerated DRQ type devices.
Signed-off-by: Borislav Petkov <petkovbb@xxxxxxxxx>
---
drivers/ide/ide-cd.c | 21 +++++++--------------
1 files changed, 7 insertions(+), 14 deletions(-)
diff --git a/drivers/ide/ide-cd.c b/drivers/ide/ide-cd.c
index 6c7dd8f..1c1ba43 100644
--- a/drivers/ide/ide-cd.c
+++ b/drivers/ide/ide-cd.c
@@ -572,24 +572,17 @@ static ide_startstop_t cdrom_transfer_packet_command(ide_drive_t *drive)
ide_debug_log(IDE_DBG_PC, "Call %s\n", __func__);
- if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
- /*
- * Here we should have been called after receiving an interrupt
- * from the device. DRQ should how be set.
- */
-
- /* check for errors */
- if (cdrom_decode_status(drive, ATA_DRQ, NULL))
- return ide_stopped;
+ /* we must wait for DRQ to get set */
+ if (ide_wait_stat(&startstop, drive, ATA_DRQ, ATA_BUSY, WAIT_READY)) {
+ printk(KERN_ERR "%s: timeout while waiting for DRQ to assert\n",
+ drive->name);
+ return startstop;
+ }
+ if (drive->atapi_flags & IDE_AFLAG_DRQ_INTERRUPT) {
/* ok, next interrupt will be DMA interrupt */
if (drive->dma)
drive->waiting_for_dma = 1;
- } else {
- /* otherwise, we must wait for DRQ to get set */
- if (ide_wait_stat(&startstop, drive, ATA_DRQ,
- ATA_BUSY, WAIT_READY))
- return startstop;
}
/* arm the interrupt handler */
--
1.6.0.4
--
Regards/Gruss,
Boris.
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