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@xxxxxxxxx>
---
drivers/ide/setup-pci.c | 61 +++++++++++++++++++++++++++++-------------------
1 file changed, 37 insertions(+), 24 deletions(-)
Index: b/drivers/ide/setup-pci.c
===================================================================
--- a/drivers/ide/setup-pci.c
+++ b/drivers/ide/setup-pci.c
@@ -132,6 +132,29 @@ static unsigned long ide_get_or_set_dma_
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)
@@ -339,36 +362,26 @@ static ide_hwif_t *ide_hwif_configure(st
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 */
--
To unsubscribe from this list: send the line "unsubscribe linux-ide" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
