Pull altix-ce1.0-asic into release branch

[linux-2.6-microblaze.git] / drivers / scsi / libata-core.c

diff --git a/drivers/scsi/libata-core.c b/drivers/scsi/libata-core.c
index 7ddd5a6..4f91b0d 100644 (file)
--- a/drivers/scsi/libata-core.c
+++ b/drivers/scsi/libata-core.c
@@ -82,6 +82,10 @@ int atapi_enabled = 0;
 module_param(atapi_enabled, int, 0444);
 MODULE_PARM_DESC(atapi_enabled, "Enable discovery of ATAPI devices (0=off, 1=on)");
 
+int libata_fua = 0;
+module_param_named(fua, libata_fua, int, 0444);
+MODULE_PARM_DESC(fua, "FUA support (0=off, 1=on)");
+
 MODULE_AUTHOR("Jeff Garzik");
 MODULE_DESCRIPTION("Library module for ATA devices");
 MODULE_LICENSE("GPL");
@@ -2514,7 +2518,7 @@ static void ata_sg_clean(struct ata_queued_cmd *qc)
        assert(sg != NULL);
 
        if (qc->flags & ATA_QCFLAG_SINGLE)
-               assert(qc->n_elem == 1);
+               assert(qc->n_elem <= 1);
 
        VPRINTK("unmapping %u sg elements\n", qc->n_elem);
 
@@ -2537,7 +2541,7 @@ static void ata_sg_clean(struct ata_queued_cmd *qc)
                        kunmap_atomic(addr, KM_IRQ0);
                }
        } else {
-               if (sg_dma_len(&sg[0]) > 0)
+               if (qc->n_elem)
                        dma_unmap_single(ap->host_set->dev,
                                sg_dma_address(&sg[0]), sg_dma_len(&sg[0]),
                                dir);
@@ -2570,7 +2574,7 @@ static void ata_fill_sg(struct ata_queued_cmd *qc)
        unsigned int idx;
 
        assert(qc->__sg != NULL);
-       assert(qc->n_elem > 0);
+       assert(qc->n_elem > 0 || qc->pad_len > 0);
 
        idx = 0;
        ata_for_each_sg(sg, qc) {
@@ -2715,6 +2719,7 @@ static int ata_sg_setup_one(struct ata_queued_cmd *qc)
        int dir = qc->dma_dir;
        struct scatterlist *sg = qc->__sg;
        dma_addr_t dma_address;
+       int trim_sg = 0;
 
        /* we must lengthen transfers to end on a 32-bit boundary */
        qc->pad_len = sg->length & 3;
@@ -2734,13 +2739,15 @@ static int ata_sg_setup_one(struct ata_queued_cmd *qc)
                sg_dma_len(psg) = ATA_DMA_PAD_SZ;
                /* trim sg */
                sg->length -= qc->pad_len;
+               if (sg->length == 0)
+                       trim_sg = 1;
 
                DPRINTK("padding done, sg->length=%u pad_len=%u\n",
                        sg->length, qc->pad_len);
        }
 
-       if (!sg->length) {
-               sg_dma_address(sg) = 0;
+       if (trim_sg) {
+               qc->n_elem--;
                goto skip_map;
        }
 
@@ -2753,9 +2760,9 @@ static int ata_sg_setup_one(struct ata_queued_cmd *qc)
        }
 
        sg_dma_address(sg) = dma_address;
-skip_map:
        sg_dma_len(sg) = sg->length;
 
+skip_map:
        DPRINTK("mapped buffer of %d bytes for %s\n", sg_dma_len(sg),
                qc->tf.flags & ATA_TFLAG_WRITE ? "write" : "read");