On 07/13/2013 03:08 AM, Sergei Shtylyov wrote:
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.
Cc: Russell King <li...@arm.linux.org.uk>
Cc: linux-scsi@vger.kernel.org
Signed-off-by: Santosh Shilimkar <santosh.shilim...@ti.com>
---
drivers/scsi/scsi_lib.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
index 86d5220..e8275fa 100644
--- a/drivers/scsi/scsi_lib.c
+++ b/drivers/scsi/scsi_lib.c
@@ -1668,7 +1668,7 @@ 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;
You definitely forgot -1 here.
Please explain your point.
Previously, 'bounce_limit' would look like 0xffffffff (unless I'm
mistaken), now it would look like 0xfffff000 which is hardly what we're
looking for, no?
Although, -1 won't give us the correct result in this case, it's
more like + PAGE_SIZE - 1.
WBR, Sergei
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