netdev - [PATCH 49/51] ARM: 7796/1: scsi: Use dma_max_pfn(dev) helper for bounce

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Message-Id: <E1VMnrK-0002Dw-Vk@rmk-PC.arm.linux.org.uk>
Date:	Fri, 20 Sep 2013 00:42:06 +0100
From:	Russell King <rmk+kernel@....linux.org.uk>
To:	alsa-devel@...a-project.org, b43-dev@...ts.infradead.org,
	devel@...verdev.osuosl.org, devicetree@...r.kernel.org,
	dri-devel@...ts.freedesktop.org, e1000-devel@...ts.sourceforge.net,
	linux-arm-kernel@...ts.infradead.org, linux-crypto@...r.kernel.org,
	linux-doc@...r.kernel.org, linux-fbdev@...r.kernel.org,
	linux-ide@...r.kernel.org, linux-media@...r.kernel.org,
	linux-mmc@...r.kernel.org, linux-nvme@...ts.infradead.org,
	linux-omap@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
	linux-samsung-soc@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-tegra@...r.kernel.org, linux-usb@...r.kernel.org,
	linux-wireless@...r.kernel.org, netdev@...r.kernel.org,
	Solarflare linux maintainers <linux-net-drivers@...arflare.com>,
	uclinux-dist-devel@...ckfin.uclinux.org
Cc:	"James E.J. Bottomley" <JBottomley@...allels.com>
Subject: [PATCH 49/51] ARM: 7796/1: scsi: Use dma_max_pfn(dev) helper for
 bounce_limit calculations

From: Santosh Shilimkar <santosh.shilimkar@...com>

DMA bounce limit is the maximum direct DMA'able memory beyond which
bounce buffers has to be used to perform dma operations. SCSI driver
relies on dma_mask but its calculation is based on max_*pfn which
don't have uniform meaning across architectures. So make use of
dma_max_pfn() which is expected to return the DMAable maximum pfn
value across architectures.

Signed-off-by: Santosh Shilimkar <santosh.shilimkar@...com>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
---
 drivers/scsi/scsi_lib.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index d1549b7..7bd7f0d 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1684,7 +1684,7 @@ u64 scsi_calculate_bounce_limit(struct Scsi_Host *shost)
 
 	host_dev = scsi_get_device(shost);
 	if (host_dev && host_dev->dma_mask)
-		bounce_limit = *host_dev->dma_mask;
+		bounce_limit = dma_max_pfn(host_dev) << PAGE_SHIFT;
 
 	return bounce_limit;
 }
-- 
1.7.4.4

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