ide: switch to DMA-mapping API part #2

Follow-up to commit 5c05ff68b9a9b40a9be949497e0aa980185565cf
("ide: switch to DMA-mapping API"):

* pci_{alloc,free}_consistent() -> dma_{alloc,free}_coherent()
  in ide_{allocate,release}_dma_engine().

* Add ->prd_max_nents and ->prd_ent_size fields to ide_hwif_t
  (+ set default values in ide_allocate_dma_engine()).

* Make ide_{allocate,release}_dma_engine() available also
  for CONFIG_BLK_DEV_IDEDMA_SFF=n.  Then convert au1xxx-ide.c,
  scc_pata.c and sgiioc4.c to use them.

* Add missing ->init_dma method to scc_pata.

This patch also fixes:
- ->dmatable_cpu leak for au1xxx-ide
- too early realease of ->dmatable_cpu for scc_pata
- wrong amount of ->dmatable_cpu memory being freed for sgiioc4

While at it:
- remove superfluous ->dma_base check from ide_unregister()
- return -ENOMEM on error in ide_release_dma_engine()
- beautify error message in ide_release_dma_engine()

Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>

2 files changed, 14 insertions, 15 deletions

diff --git a/drivers/ide/pci/scc_pata.c b/drivers/ide/pci/scc_pata.c
index 3e75bf5f5e37..9ce1d8059921 100644
--- a/drivers/ide/pci/scc_pata.c
+++ b/drivers/ide/pci/scc_pata.c
@@ -821,6 +821,12 @@ static void __devinit init_iops_scc(ide_hwif_t *hwif)
 	init_mmio_iops_scc(hwif);
 }
 
+static int __devinit scc_init_dma(ide_hwif_t *hwif,
+				  const struct ide_port_info *d)
+{
+	return ide_allocate_dma_engine(hwif);
+}
+
 static u8 scc_cable_detect(ide_hwif_t *hwif)
 {
 	return ATA_CBL_PATA80;
@@ -885,6 +891,7 @@ static const struct ide_dma_ops scc_dma_ops = {
   {							\
       .name		= name_str,			\
       .init_iops	= init_iops_scc,		\
+      .init_dma		= scc_init_dma,			\
       .init_hwif	= init_hwif_scc,		\
       .tp_ops		= &scc_tp_ops,		\
       .port_ops		= &scc_port_ops,		\
@@ -922,13 +929,6 @@ static void __devexit scc_remove(struct pci_dev *dev)
 {
 	struct scc_ports *ports = pci_get_drvdata(dev);
 	struct ide_host *host = ports->host;
-	ide_hwif_t *hwif = host->ports[0];
-
-	if (hwif->dmatable_cpu) {
-		pci_free_consistent(dev, PRD_ENTRIES * PRD_BYTES,
-				    hwif->dmatable_cpu, hwif->dmatable_dma);
-		hwif->dmatable_cpu = NULL;
-	}
 
 	ide_host_remove(host);
 
diff --git a/drivers/ide/pci/sgiioc4.c b/drivers/ide/pci/sgiioc4.c
index 84cd986810cf..dd634541ce36 100644
--- a/drivers/ide/pci/sgiioc4.c
+++ b/drivers/ide/pci/sgiioc4.c
@@ -357,14 +357,13 @@ ide_dma_sgiioc4(ide_hwif_t *hwif, const struct ide_port_info *d)
 	}
 	hwif->dma_base = (unsigned long) virt_dma_base;
 
-	hwif->dmatable_cpu = pci_alloc_consistent(dev,
-					  IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
-					  &hwif->dmatable_dma);
+	hwif->sg_max_nents = IOC4_PRD_ENTRIES;
 
-	if (!hwif->dmatable_cpu)
-		goto dma_pci_alloc_failure;
+	hwif->prd_max_nents = IOC4_PRD_ENTRIES;
+	hwif->prd_ent_size = IOC4_PRD_BYTES;
 
-	hwif->sg_max_nents = IOC4_PRD_ENTRIES;
+	if (ide_allocate_dma_engine(hwif))
+		goto dma_pci_alloc_failure;
 
 	pad = pci_alloc_consistent(dev, IOC4_IDE_CACHELINE_SIZE,
 				   (dma_addr_t *)&hwif->extra_base);
@@ -373,8 +372,8 @@ ide_dma_sgiioc4(ide_hwif_t *hwif, const struct ide_port_info *d)
 		return 0;
 	}
 
-	pci_free_consistent(dev, IOC4_PRD_ENTRIES * IOC4_PRD_BYTES,
-			    hwif->dmatable_cpu, hwif->dmatable_dma);
+	ide_release_dma_engine(hwif);
+
 	printk(KERN_ERR "%s(%s) -- ERROR: Unable to allocate DMA maps\n",
 	       __func__, hwif->name);
 	printk(KERN_INFO "%s: changing from DMA to PIO mode", hwif->name);