linux-kernel - [PATCH] Use unchecked_isa_dma in sd_revalidate

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Date:	Thu, 22 Mar 2007 18:17:03 +0100
From:	Bernhard Walle <bwalle@...e.de>
To:	linux-scsi@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] Use unchecked_isa_dma in sd_revalidate_disk()

In sd_revalidate_disk(), the SCSI Disk driver needs a few bytes DMA memory,
allocated by kmalloc() and __GFP_DMA. This patch uses __GFP_DMA only if
the corresponding host structure has unchecked_isa_dma set.

Signed-off-by: Bernhard Walle <bwalle@...e.de>

---
 drivers/scsi/sd.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

Index: linux-2.6.21-rc4/drivers/scsi/sd.c
===================================================================
--- linux-2.6.21-rc4.orig/drivers/scsi/sd.c
+++ linux-2.6.21-rc4/drivers/scsi/sd.c
@@ -1553,7 +1553,8 @@ static int sd_revalidate_disk(struct gen
 	if (!scsi_device_online(sdp))
 		goto out;
 
-	buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL | __GFP_DMA);
+	buffer = kmalloc(SD_BUF_SIZE, GFP_KERNEL | 
+			(sdp->host->unchecked_isa_dma ? __GFP_DMA : 0));
 	if (!buffer) {
 		printk(KERN_WARNING "(sd_revalidate_disk:) Memory allocation "
 		       "failure.\n");
-
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