linux-kernel - Re: [PATCH 0/8] ide-cd: first conversion batch

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Message-ID: <20081226134556.GA23503@gollum.tnic>
Date:	Fri, 26 Dec 2008 14:45:56 +0100
From:	Borislav Petkov <petkovbb@...glemail.com>
To:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
Cc:	linux-kernel@...r.kernel.org, linux-ide@...r.kernel.org
Subject: Re: [PATCH 0/8] ide-cd: first conversion batch

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@...il.com>
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@...il.com>
---
 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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