[PATCH RFC 49/51] ARM: 7796/1: scsi: Use dma_max_pfn(dev) helper forbounce_limit calculations

From: Santosh Shilimkar
Date: Thu Aug 01 2013 - 18:23:44 EST

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@xxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
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 124392f..1be55e3 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;

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