Commit 53e4d30d authored by Rajesh Shah's avatar Rajesh Shah Committed by Greg Kroah-Hartman

[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: default avatarRajesh Shah <rajesh.shah@intel.com>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@suse.de>
parent 9c273b95
......@@ -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);
}
......@@ -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.
......
......@@ -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 */
......
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