From e8e25f03e19c2c47834c821511625c0b80567827 Mon Sep 17 00:00:00 2001
From: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
Date: Tue, 15 Jul 2008 21:21:51 +0200
Subject: ide-scsi: fix DRQ checking for DMA transfers in idescsi_pc_intr()

If DRQ bit of Status Register is not cleared it is an error condition
and should be handled accordingly (disable DMA + reset the device).

Cc: Borislav Petkov <petkovbb@gmail.com>
Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

diff --git a/drivers/scsi/ide-scsi.c b/drivers/scsi/ide-scsi.c
index 2553ef4..e67cf8a 100644
--- a/drivers/scsi/ide-scsi.c
+++ b/drivers/scsi/ide-scsi.c
@@ -388,7 +388,6 @@ static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 		return ide_stopped;
 	}
 	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
-		pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 #if IDESCSI_DEBUG_LOG
 		printk ("ide-scsi: %s: DMA complete\n", drive->name);
 #endif /* IDESCSI_DEBUG_LOG */
@@ -404,12 +403,20 @@ static ide_startstop_t idescsi_pc_intr (ide_drive_t *drive)
 		if (test_bit(IDESCSI_LOG_CMD, &scsi->log))
 			printk(KERN_INFO "Packet command completed, %d bytes"
 					" transferred\n", pc->xferred);
+		pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
 		local_irq_enable_in_hardirq();
 		if (stat & ERR_STAT)
 			rq->errors++;
 		idescsi_end_request (drive, 1, 0);
 		return ide_stopped;
 	}
+	if (pc->flags & PC_FLAG_DMA_IN_PROGRESS) {
+		pc->flags &= ~PC_FLAG_DMA_IN_PROGRESS;
+		printk(KERN_ERR "%s: The device wants to issue more interrupts "
+				"in DMA mode\n", drive->name);
+		ide_dma_off(drive);
+		return ide_do_reset(drive);
+	}
 	bcount = (hwif->INB(hwif->io_ports.lbah_addr) << 8) |
 		  hwif->INB(hwif->io_ports.lbam_addr);
 	ireason = hwif->INB(hwif->io_ports.nsect_addr);
-- 
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