[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>

diff --git a/arch/i386/pci/common.c b/arch/i386/pci/common.c
index dbece776c5b281f4a95d97eab3016a069446bb60..c624b61e110455e746ac021c8f7430d1f58251cc 100644 (file)
--- a/arch/i386/pci/common.c
+++ b/arch/i386/pci/common.c
@@ -288,6 +288,7 @@ int pcibios_enable_device(struct pci_dev *dev, int mask)
 
 void pcibios_disable_device (struct pci_dev *dev)
 {
+       pcibios_disable_resources(dev);
        if (pcibios_disable_irq)
                pcibios_disable_irq(dev);
 }

diff --git a/arch/i386/pci/i386.c b/arch/i386/pci/i386.c
index ed2c8c899bd37b6bad02568d65d036fcad8770c0..7852827a599b07b5f6a5f053c617a7ac70259eaa 100644 (file)
--- 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.

diff --git a/arch/i386/pci/pci.h b/arch/i386/pci/pci.h
index 12035e29108b445889006bb5aa842057ad9d5bb3..12bf3d8dda297e3f68f39dc06e996dfafedac58d 100644 (file)
--- a/arch/i386/pci/pci.h
+++ b/arch/i386/pci/pci.h
@@ -35,6 +35,7 @@ extern unsigned int pcibios_max_latency;
 
 void pcibios_resource_survey(void);
 int pcibios_enable_resources(struct pci_dev *, int);
+void pcibios_disable_resources(struct pci_dev *);
 
 /* pci-pc.c */