[PATCH 3.16 65/99] scsi: megaraid_sas: Use 63-bit DMA addressing

[Ben Hutchings]

3.16.65-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Shivasharan S <shivasharan.srikanteshwara@xxxxxxxxxxxx>

commit 894169db12463cea08d0e2a9e35f42b291340e5a upstream.

Although MegaRAID controllers support 64-bit DMA addressing, as per
hardware design, DMA address with all 64-bits set
(0xFFFFFFFF-FFFFFFFF) results in a firmware fault.

Driver will set 63-bit DMA mask to ensure the above address will not be
used.

Signed-off-by: Shivasharan S <shivasharan.srikanteshwara@xxxxxxxxxxxx>
Signed-off-by: Martin K. Petersen <martin.petersen@xxxxxxxxxx>
[bwh: Backported to 3.16: Only one instance of a 64-bit mask needs changing]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -4592,7 +4592,7 @@ megasas_set_dma_mask(struct pci_dev *pde
 	 * All our contollers are capable of performing 64-bit DMA
 	 */
 	if (IS_DMA64) {
-		if (pci_set_dma_mask(pdev, DMA_BIT_MASK(64)) != 0) {
+		if (pci_set_dma_mask(pdev, DMA_BIT_MASK(63)) != 0) {
 
 			if (pci_set_dma_mask(pdev, DMA_BIT_MASK(32)) != 0)
 				goto fail_set_dma_mask;