linux-kernel - [PATCH 03/40] ide-scsi: fix handling of DMA errors in idescsi_pc

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Message-Id: <20080518185454.5636.48014.sendpatchset@localhost.localdomain>
Date:	Sun, 18 May 2008 20:54:54 +0200
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	linux-ide@...r.kernel.org
Cc:	Borislav Petkov <petkovbb@...il.com>,
	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>,
	linux-kernel@...r.kernel.org
Subject: [PATCH 03/40] ide-scsi: fix handling of DMA errors in idescsi_pc_intr()

Check return value of ->dma_end method and if there was a DMA error
handle it accordingly (set PC_FLAG_DMA_ERROR pc flag, don't update
pc->xferred and increase rq->errors).

Also move debug message in the right place while at it.

Cc: Borislav Petkov <petkovbb@...il.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
---
 drivers/scsi/ide-scsi.c |    8 +++++---
 1 file changed, 5 insertions(+), 3 deletions(-)

Index: b/drivers/scsi/ide-scsi.c
===================================================================
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -388,11 +388,13 @@ static ide_startstop_t idescsi_pc_intr (
 		return ide_stopped;
 	}
 	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
+		if (hwif->dma_ops->dma_end(drive))
+			pc->flags |= PC_FLAG_DMA_ERROR;
+		else
+			pc->xferred = pc->req_xfer;
 #if IDESCSI_DEBUG_LOG
 		printk ("ide-scsi: %s: DMA complete\n", drive->name);
 #endif /* IDESCSI_DEBUG_LOG */
-		pc->xferred = pc->req_xfer;
-		(void)hwif->dma_ops->dma_end(drive);
 	}
 
 	/* Clear the interrupt */
@@ -405,7 +407,7 @@ static ide_startstop_t idescsi_pc_intr (
 					" transferred\n", pc->xferred);
 		pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 		local_irq_enable_in_hardirq();
-		if (stat & ERR_STAT)
+		if ((stat & ERR_STAT) || (pc->flags & PC_FLAG_DMA_ERROR))
 			rq->errors++;
 		idescsi_end_request (drive, 1, 0);
 		return ide_stopped;
--
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