diff options
| -rw-r--r-- | drivers/ata/libata-core.c | 61 |
1 files changed, 35 insertions, 26 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index a7e3df5abaa3..dc70b5f997f1 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -4814,32 +4814,6 @@ static unsigned int ata_dev_init_params(struct ata_device *dev, } /** - * ata_sg_clean - Unmap DMA memory associated with command - * @qc: Command containing DMA memory to be released - * - * Unmap all mapped DMA memory associated with this command. - * - * LOCKING: - * spin_lock_irqsave(host lock) - */ -static void ata_sg_clean(struct ata_queued_cmd *qc) -{ - struct ata_port *ap = qc->ap; - struct scatterlist *sg = qc->sg; - int dir = qc->dma_dir; - - WARN_ON_ONCE(sg == NULL); - - VPRINTK("unmapping %u sg elements\n", qc->n_elem); - - if (qc->n_elem) - dma_unmap_sg(ap->dev, sg, qc->orig_n_elem, dir); - - qc->flags &= ~ATA_QCFLAG_DMAMAP; - qc->sg = NULL; -} - -/** * atapi_check_dma - Check whether ATAPI DMA can be supported * @qc: Metadata associated with taskfile to check * @@ -4923,6 +4897,34 @@ void ata_sg_init(struct ata_queued_cmd *qc, struct scatterlist *sg, qc->cursg = qc->sg; } +#ifdef CONFIG_HAS_DMA + +/** + * ata_sg_clean - Unmap DMA memory associated with command + * @qc: Command containing DMA memory to be released + * + * Unmap all mapped DMA memory associated with this command. + * + * LOCKING: + * spin_lock_irqsave(host lock) + */ +void ata_sg_clean(struct ata_queued_cmd *qc) +{ + struct ata_port *ap = qc->ap; + struct scatterlist *sg = qc->sg; + int dir = qc->dma_dir; + + WARN_ON_ONCE(sg == NULL); + + VPRINTK("unmapping %u sg elements\n", qc->n_elem); + + if (qc->n_elem) + dma_unmap_sg(ap->dev, sg, qc->orig_n_elem, dir); + + qc->flags &= ~ATA_QCFLAG_DMAMAP; + qc->sg = NULL; +} + /** * ata_sg_setup - DMA-map the scatter-gather table associated with a command. * @qc: Command with scatter-gather table to be mapped. @@ -4955,6 +4957,13 @@ static int ata_sg_setup(struct ata_queued_cmd *qc) return 0; } +#else /* !CONFIG_HAS_DMA */ + +static inline void ata_sg_clean(struct ata_queued_cmd *qc) {} +static inline int ata_sg_setup(struct ata_queued_cmd *qc) { return -1; } + +#endif /* !CONFIG_HAS_DMA */ + /** * swap_buf_le16 - swap halves of 16-bit words in place * @buf: Buffer to swap |