PCI: modify PCI bridge control ISA flag for clarity

Modify PCI Bridge Control ISA flag for clarity

This patch changes PCI_BRIDGE_CTL_NO_ISA to PCI_BRIDGE_CTL_ISA
and modifies it's clarifying comment and locations where used.
The change reduces the chance of future confusion since it makes
the set/unset meaning of the bit the same in both the bridge
control register and bridge_ctl field of the pci_bus struct.

Signed-off-by: Gary Hade <garyhade@us.ibm.com>
Acked-by: Linas Vepstas <linas@austin.ibm.com>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

3 files changed, 4 insertions, 4 deletions

diff --git a/arch/x86/pci/i386.c b/arch/x86/pci/i386.c
index 055187bc255a..42ba0e2da1a0 100644
--- a/arch/x86/pci/i386.c
+++ b/arch/x86/pci/i386.c
@@ -37,7 +37,7 @@ static int
 skip_isa_ioresource_align(struct pci_dev *dev) {
 
         if ((pci_probe & PCI_CAN_SKIP_ISA_ALIGN) &&
-            (dev->bus->bridge_ctl & PCI_BRIDGE_CTL_NO_ISA))
+            !(dev->bus->bridge_ctl & PCI_BRIDGE_CTL_ISA))
                 return 1;
         return 0;
 }
diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 3112024bdc2a..5db6b6690b59 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -543,7 +543,7 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass
                         goto out;
                 child->primary = buses & 0xFF;
                 child->subordinate = (buses >> 16) & 0xFF;
-                child->bridge_ctl = bctl ^ PCI_BRIDGE_CTL_NO_ISA;
+                child->bridge_ctl = bctl;
 
                 cmax = pci_scan_child_bus(child);
                 if (cmax > max)
@@ -596,7 +596,7 @@ int pci_scan_bridge(struct pci_bus *bus, struct pci_dev * dev, int max, int pass
                 pci_write_config_dword(dev, PCI_PRIMARY_BUS, buses);
 
                 if (!is_cardbus) {
-                        child->bridge_ctl = bctl ^ PCI_BRIDGE_CTL_NO_ISA;
+                        child->bridge_ctl = bctl;
                         /*
                          * Adjust subordinate busnr in parent buses.
                          * We do this before scanning for children because
diff --git a/include/linux/pci_regs.h b/include/linux/pci_regs.h
index 4a24ee368a11..c1914a8b94a9 100644
--- a/include/linux/pci_regs.h
+++ b/include/linux/pci_regs.h
@@ -147,7 +147,7 @@
 #define PCI_BRIDGE_CONTROL      0x3e
 #define  PCI_BRIDGE_CTL_PARITY  0x01    /* Enable parity detection on secondary interface */
 #define  PCI_BRIDGE_CTL_SERR    0x02    /* The same for SERR forwarding */
-#define  PCI_BRIDGE_CTL_NO_ISA  0x04    /* Disable bridging of ISA ports */
+#define  PCI_BRIDGE_CTL_ISA     0x04    /* Enable ISA mode */
 #define  PCI_BRIDGE_CTL_VGA     0x08    /* Forward VGA addresses */
 #define  PCI_BRIDGE_CTL_MASTER_ABORT    0x20  /* Report master aborts */
 #define  PCI_BRIDGE_CTL_BUS_RESET       0x40    /* Secondary bus reset */