1 files changed, 26 insertions, 11 deletions

diff --git a/drivers/ata/sata_mv.c b/drivers/ata/sata_mv.c
index 3acf65e75eb2..cb7dec97fee6 100644
--- a/drivers/ata/sata_mv.c
+++ b/drivers/ata/sata_mv.c
@@ -72,7 +72,7 @@
 #include <linux/libata.h>
 
 #define DRV_NAME	"sata_mv"
-#define DRV_VERSION	"0.81"
+#define DRV_VERSION	"1.0"
 
 enum {
 	/* BAR's are enumerated in terms of pci_resource_start() terms */
@@ -313,7 +313,10 @@ enum {
 #define IS_GEN_IIE(hpriv) ((hpriv)->hp_flags & MV_HP_GEN_IIE)
 
 enum {
-	MV_DMA_BOUNDARY		= 0xffffffffU,
+	/* DMA boundary 0xffff is required by the s/g splitting
+	 * we need on /length/ in mv_fill-sg().
+	 */
+	MV_DMA_BOUNDARY		= 0xffffU,
 
 	/* mask of register bits containing lower 32 bits
 	 * of EDMA request queue DMA address
@@ -448,7 +451,7 @@ static struct scsi_host_template mv5_sht = {
 	.queuecommand		= ata_scsi_queuecmd,
 	.can_queue		= ATA_DEF_QUEUE,
 	.this_id		= ATA_SHT_THIS_ID,
-	.sg_tablesize		= MV_MAX_SG_CT,
+	.sg_tablesize		= MV_MAX_SG_CT / 2,
 	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
 	.emulated		= ATA_SHT_EMULATED,
 	.use_clustering		= 1,
@@ -466,7 +469,7 @@ static struct scsi_host_template mv6_sht = {
 	.queuecommand		= ata_scsi_queuecmd,
 	.can_queue		= ATA_DEF_QUEUE,
 	.this_id		= ATA_SHT_THIS_ID,
-	.sg_tablesize		= MV_MAX_SG_CT,
+	.sg_tablesize		= MV_MAX_SG_CT / 2,
 	.cmd_per_lun		= ATA_SHT_CMD_PER_LUN,
 	.emulated		= ATA_SHT_EMULATED,
 	.use_clustering		= 1,
@@ -1139,15 +1142,27 @@ static unsigned int mv_fill_sg(struct ata_queued_cmd *qc)
 		dma_addr_t addr = sg_dma_address(sg);
 		u32 sg_len = sg_dma_len(sg);
 
-		mv_sg->addr = cpu_to_le32(addr & 0xffffffff);
-		mv_sg->addr_hi = cpu_to_le32((addr >> 16) >> 16);
-		mv_sg->flags_size = cpu_to_le32(sg_len & 0xffff);
+		while (sg_len) {
+			u32 offset = addr & 0xffff;
+			u32 len = sg_len;
+
+			if ((offset + sg_len > 0x10000))
+				len = 0x10000 - offset;
+
+			mv_sg->addr = cpu_to_le32(addr & 0xffffffff);
+			mv_sg->addr_hi = cpu_to_le32((addr >> 16) >> 16);
+			mv_sg->flags_size = cpu_to_le32(len);
 
-		if (ata_sg_is_last(sg, qc))
-			mv_sg->flags_size |= cpu_to_le32(EPRD_FLAG_END_OF_TBL);
+			sg_len -= len;
+			addr += len;
+
+			if (!sg_len && ata_sg_is_last(sg, qc))
+				mv_sg->flags_size |= cpu_to_le32(EPRD_FLAG_END_OF_TBL);
+
+			mv_sg++;
+			n_sg++;
+		}
 
-		mv_sg++;
-		n_sg++;
 	}
 
 	return n_sg;