ide: factor out setting PCI bus-mastering from ide_hwif_setup_dma()

Factor out setting PCI bus-mastering from ide_hwif_setup_dma()
to ide_pci_set_master() helper.

While at it:

* don't read PCI Command register if not necessary

* use PCI device name instead of hwif->name

* cleanup ide_hwif_setup_dma() a bit

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

diff --git a/drivers/ide/setup-pci.c b/drivers/ide/setup-pci.c
index f8fc972..bf28970 100644 (file)
--- a/drivers/ide/setup-pci.c
+++ b/drivers/ide/setup-pci.c
@@ -132,6 +132,29 @@ static unsigned long ide_get_or_set_dma_base(const struct ide_port_info *d, ide_
 out:
        return dma_base;
 }
+
+/*
+ * Set up BM-DMA capability (PnP BIOS should have done this)
+ */
+static int ide_pci_set_master(struct pci_dev *dev, const char *name)
+{
+       u16 pcicmd;
+
+       pci_read_config_word(dev, PCI_COMMAND, &pcicmd);
+
+       if ((pcicmd & PCI_COMMAND_MASTER) == 0) {
+               pci_set_master(dev);
+
+               if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd) ||
+                   (pcicmd & PCI_COMMAND_MASTER) == 0) {
+                       printk(KERN_ERR "%s: error updating PCICMD on %s\n",
+                                       name, pci_name(dev));
+                       return -EIO;
+               }
+       }
+
+       return 0;
+}
 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */
 
 void ide_setup_pci_noise(struct pci_dev *dev, const struct ide_port_info *d)
@@ -340,36 +363,26 @@ static ide_hwif_t *ide_hwif_configure(struct pci_dev *dev,
 void ide_hwif_setup_dma(ide_hwif_t *hwif, const struct ide_port_info *d)
 {
        struct pci_dev *dev = to_pci_dev(hwif->dev);
-       u16 pcicmd;
-
-       pci_read_config_word(dev, PCI_COMMAND, &pcicmd);
 
        if ((d->host_flags & IDE_HFLAG_NO_AUTODMA) == 0 ||
            ((dev->class >> 8) == PCI_CLASS_STORAGE_IDE &&
             (dev->class & 0x80))) {
                unsigned long dma_base = ide_get_or_set_dma_base(d, hwif);
-               if (dma_base && !(pcicmd & PCI_COMMAND_MASTER)) {
-                       /*
-                        * Set up BM-DMA capability
-                        * (PnP BIOS should have done this)
-                        */
-                       pci_set_master(dev);
-                       if (pci_read_config_word(dev, PCI_COMMAND, &pcicmd) || !(pcicmd & PCI_COMMAND_MASTER)) {
-                               printk(KERN_ERR "%s: %s error updating PCICMD\n",
-                                       hwif->name, d->name);
-                               dma_base = 0;
-                       }
-               }
-               if (dma_base) {
-                       if (d->init_dma)
-                               d->init_dma(hwif, dma_base);
-
-                       ide_setup_dma(hwif, dma_base);
-               } else {
-                       printk(KERN_INFO "%s: %s Bus-Master DMA disabled "
-                               "(BIOS)\n", hwif->name, d->name);
-               }
+
+               if (dma_base == 0 || ide_pci_set_master(dev, d->name) < 0)
+                       goto out_disabled;
+
+               if (d->init_dma)
+                       d->init_dma(hwif, dma_base);
+
+               ide_setup_dma(hwif, dma_base);
        }
+
+       return;
+
+out_disabled:
+       printk(KERN_INFO "%s: Bus-Master DMA disabled (BIOS) on %s\n",
+                        d->name, pci_name(dev));
 }
 #endif /* CONFIG_BLK_DEV_IDEDMA_PCI */