[PATCH] PCI: i386/x86_84: disable PCI resource decode on device disable

When a PCI device is disabled via pci_disable_device(), it's still
left decoding its BAR resource ranges even though its driver
will have likely released those regions (and may even have
unloaded). pci_enable_device() already explicitly enables
BAR resource decode for the device being enabled. This patch
disables resource decode for the PCI device being disabled,
making it symmetric with the enable call.

I saw this while doing something else, not because of a
problem report. Still, seems to be the correct thing to do.

Signed-off-by: Rajesh Shah <rajesh.shah@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

1 files changed, 9 insertions, 0 deletions

diff --git a/arch/i386/pci/i386.c b/arch/i386/pci/i386.c
index ed2c8c899bd3..7852827a599b 100644
--- a/arch/i386/pci/i386.c
+++ b/arch/i386/pci/i386.c
@@ -242,6 +242,15 @@ int pcibios_enable_resources(struct pci_dev *dev, int mask)
         return 0;
 }
 
+void pcibios_disable_resources(struct pci_dev *dev)
+{
+        u16 cmd;
+
+        pci_read_config_word(dev, PCI_COMMAND, &cmd);
+        cmd &= ~(PCI_COMMAND_IO | PCI_COMMAND_MEMORY);
+        pci_write_config_word(dev, PCI_COMMAND, cmd);
+}
+
 /*
  *  If we set up a device for bus mastering, we need to check the latency
  *  timer as certain crappy BIOSes forget to set it properly.