[POWERPC] Create and use get_pci_dma_ops()

This allows us to hide pci_dma_ops.

Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Paul Mackerras <paulus@samba.org>

diff --git a/arch/powerpc/kernel/pci_64.c b/arch/powerpc/kernel/pci_64.c
index 73d5093..db1d40e 100644 (file)
--- a/arch/powerpc/kernel/pci_64.c
+++ b/arch/powerpc/kernel/pci_64.c
@@ -61,8 +61,7 @@ void iSeries_pcibios_init(void);
 
 LIST_HEAD(hose_list);
 
-struct dma_mapping_ops *pci_dma_ops;
-EXPORT_SYMBOL(pci_dma_ops);
+static struct dma_mapping_ops *pci_dma_ops;
 
 int global_phb_number;         /* Global phb counter */
 
@@ -75,6 +74,12 @@ void set_pci_dma_ops(struct dma_mapping_ops *dma_ops)
        pci_dma_ops = dma_ops;
 }
 
+struct dma_mapping_ops *get_pci_dma_ops(void)
+{
+       return pci_dma_ops;
+}
+EXPORT_SYMBOL(get_pci_dma_ops);
+
 static void fixup_broken_pcnet32(struct pci_dev* dev)
 {
        if ((dev->class>>8 == PCI_CLASS_NETWORK_ETHERNET)) {

diff --git a/arch/powerpc/platforms/cell/iommu.c b/arch/powerpc/platforms/cell/iommu.c
index d0e02ea..7c953cc 100644 (file)
--- a/arch/powerpc/platforms/cell/iommu.c
+++ b/arch/powerpc/platforms/cell/iommu.c
@@ -496,7 +496,7 @@ static void cell_dma_dev_setup(struct device *dev)
        struct dev_archdata *archdata = &dev->archdata;
 
        /* If we run without iommu, no need to do anything */
-       if (pci_dma_ops == &dma_direct_ops)
+       if (get_pci_dma_ops() == &dma_direct_ops)
                return;
 
        /* Current implementation uses the first window available in that
@@ -530,7 +530,7 @@ static int cell_of_bus_notify(struct notifier_block *nb, unsigned long action,
                return 0;
 
        /* We use the PCI DMA ops */
-       dev->archdata.dma_ops = pci_dma_ops;
+       dev->archdata.dma_ops = get_pci_dma_ops();
 
        cell_dma_dev_setup(dev);
 

diff --git a/arch/powerpc/platforms/celleb/iommu.c b/arch/powerpc/platforms/celleb/iommu.c
index fecc4ff..e94de6a 100644 (file)
--- a/arch/powerpc/platforms/celleb/iommu.c
+++ b/arch/powerpc/platforms/celleb/iommu.c
@@ -80,7 +80,7 @@ static int celleb_of_bus_notify(struct notifier_block *nb,
        if (action != BUS_NOTIFY_ADD_DEVICE)
                return 0;
 
-       dev->archdata.dma_ops = pci_dma_ops;
+       dev->archdata.dma_ops = get_pci_dma_ops();
 
        return 0;
 }

diff --git a/include/asm-powerpc/pci.h b/include/asm-powerpc/pci.h
index ebf31f1..ce0f13e 100644 (file)
--- a/include/asm-powerpc/pci.h
+++ b/include/asm-powerpc/pci.h
@@ -71,17 +71,18 @@ static inline int pci_get_legacy_ide_irq(struct pci_dev *dev, int channel)
 #define PCI_DISABLE_MWI
 
 #ifdef CONFIG_PCI
-extern struct dma_mapping_ops *pci_dma_ops;
-
 extern void set_pci_dma_ops(struct dma_mapping_ops *dma_ops);
+extern struct dma_mapping_ops *get_pci_dma_ops(void);
 
 /* For DAC DMA, we currently don't support it by default, but
  * we let 64-bit platforms override this.
  */
 static inline int pci_dac_dma_supported(struct pci_dev *hwdev,u64 mask)
 {
-       if (pci_dma_ops && pci_dma_ops->dac_dma_supported)
-               return pci_dma_ops->dac_dma_supported(&hwdev->dev, mask);
+       struct dma_mapping_ops *d = get_pci_dma_ops();
+
+       if (d && d->dac_dma_supported)
+               return d->dac_dma_supported(&hwdev->dev, mask);
        return 0;
 }
 
@@ -103,6 +104,7 @@ static inline void pci_dma_burst_advice(struct pci_dev *pdev,
 }
 #else  /* CONFIG_PCI */
 #define set_pci_dma_ops(d)
+#define get_pci_dma_ops()      NULL
 #endif
 
 extern int pci_domain_nr(struct pci_bus *bus);