diff options
| author | Geert Uytterhoeven <geert@linux-m68k.org> | 2017-01-03 21:09:49 +0300 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2017-01-06 19:32:44 +0300 |
| commit | 2874d5ee6c06ab72f2729968926b3d5ef8fca897 (patch) | |
| tree | 1f0157a5837d36d047311e1bab03b7732b965107 /drivers/ata | |
| parent | 6cf32ed9eee2d34db441ba6ebad3ec2d67952688 (diff) | |
| download | linux-2874d5ee6c06ab72f2729968926b3d5ef8fca897.tar.xz | |
libata: Protect DMA core code by #ifdef CONFIG_HAS_DMA
If NO_DMA=y:
ERROR: "bad_dma_ops" [drivers/ata/libata.ko] undefined!
To fix this, protect the DMA code by #ifdef CONFIG_HAS_DMA, and provide
dummies of ata_sg_clean() and ata_sg_setup() for the !CONFIG_HAS_DMA
case.
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'drivers/ata')
| -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 |