linux-kernel - [PATCH] icside: icside_dma

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Date:	Sun, 1 Feb 2009 20:12:23 +0100
From:	Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
To:	linux-ide@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] icside: icside_dma_setup() fixes

Check for ide_build_sglist() return value and re-map sg table if necessary.

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@...il.com>
---
 drivers/ide/icside.c |    4 ++++
 1 file changed, 4 insertions(+)

Index: b/drivers/ide/icside.c
===================================================================
--- a/drivers/ide/icside.c
+++ b/drivers/ide/icside.c
@@ -326,6 +326,10 @@ static int icside_dma_setup(ide_drive_t 
 	BUG_ON(dma_channel_active(ec->dma));
 
 	hwif->sg_nents = ide_build_sglist(drive, rq);
+	if (hwif->sg_nents == 0) {
+		ide_map_sg(drive, rq);
+		return 1;
+	}
 
 	/*
 	 * Ensure that we have the right interrupt routed.
--
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