Patchwork [49/51] ARM: 7796/1: scsi: Use dma_max_pfn(dev) helper for bounce_limit calculations

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Submitter Russell King
Date Sept. 19, 2013, 11:42 p.m.
Message ID <E1VMnrK-0002Dw-Vk@rmk-PC.arm.linux.org.uk>
Download mbox | patch
Permalink /patch/276282/
State Not Applicable
Delegated to: David Miller
Headers show

Comments

Russell King - Sept. 19, 2013, 11:42 p.m.
From: Santosh Shilimkar <santosh.shilimkar@ti.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@ti.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
---
 drivers/scsi/scsi_lib.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

Patch

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;
 }