linux-kernel - [PATCH 01/40] ide-scsi: fix race in idescsi_transfer

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Date:	Sun, 18 May 2008 20:54:36 +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 01/40] ide-scsi: fix race in idescsi_transfer_pc()

Start DMA engine before sending content of packet command (otherwise
it is possible that IRQ will happen before DMA engine is started).

Cc: Borislav Petkov <petkovbb@...il.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
---
 drivers/scsi/ide-scsi.c |    7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

Index: b/drivers/scsi/ide-scsi.c
===================================================================
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -494,13 +494,14 @@ static ide_startstop_t idescsi_transfer_
 	/* Set the interrupt routine */
 	ide_set_handler(drive, &idescsi_pc_intr, get_timeout(pc), idescsi_expiry);
 
-	/* Send the actual packet */
-	hwif->output_data(drive, NULL, scsi->pc->c, 12);
-
 	if (pc->flags & PC_FLAG_DMA_OK) {
 		pc->flags |= PC_FLAG_DMA_IN_PROGRESS;
 		hwif->dma_ops->dma_start(drive);
 	}
+
+	/* Send the actual packet */
+	hwif->output_data(drive, NULL, scsi->pc->c, 12);
+
 	return ide_started;
 }
 
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