[PATCH] sata: fix sata_sx4 dma_prep to not use sg->length

 sata_sx4 directly references sg->length to calculate total_len in
pdc20621_dma_prep().  This is incorrect as dma_map_sg() could have
merged multiple sg's into one and, in such case, sg->length doesn't
reflect true size of the entry.  This patch makes it use
sg_dma_len(sg).

Signed-off-by: Tejun Heo <htejun@gmail.com>
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

diff --git a/drivers/scsi/sata_sx4.c b/drivers/scsi/sata_sx4.c
index 140cea0..efd7d7a 100644 (file)
--- a/drivers/scsi/sata_sx4.c
+++ b/drivers/scsi/sata_sx4.c
@@ -468,7 +468,7 @@ static void pdc20621_dma_prep(struct ata_queued_cmd *qc)
        for (i = 0; i < last; i++) {
                buf[idx++] = cpu_to_le32(sg_dma_address(&sg[i]));
                buf[idx++] = cpu_to_le32(sg_dma_len(&sg[i]));
-               total_len += sg[i].length;
+               total_len += sg_dma_len(&sg[i]);
        }
        buf[idx - 1] |= cpu_to_le32(ATA_PRD_EOT);
        sgt_len = idx * 4;