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PCI: Propagate the "ignore hotplug" setting to parent

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Refine the mechanism introduced by commit f244d8b623 ("ACPIPHP / radeon /
nouveau: Fix VGA switcheroo problem related to hotplug") to propagate the
ignore_hotplug setting of the device to its parent bridge in case hotplug
notifications related to the graphics adapter switching are given for the
bridge rather than for the device itself (they need to be ignored in both
cases).

Link: https://bugzilla.kernel.org/show_bug.cgi?id=61891
Link: https://bugs.freedesktop.org/show_bug.cgi?id=88927
Fixes: b440bde74f ("PCI: Add pci_ignore_hotplug() to ignore hotplug events for a device")
Reported-and-tested-by: tiagdtd-lava <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Bjorn Helgaas <[email protected]>
CC: [email protected]	# v3.17+
This commit is contained in:
Rafael J. Wysocki 2015-04-13 16:23:36 +02:00 • committed by Bjorn Helgaas
commit 0824965140
2 changed files with 12 additions and 5 deletions
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11
drivers/pci/pci.c
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@ -4324,6 +4324,17 @@ bool pci_device_is_present(struct pci_dev *pdev)
}
EXPORT_SYMBOL_GPL(pci_device_is_present);
void pci_ignore_hotplug(struct pci_dev *dev)
{
struct pci_dev *bridge = dev->bus->self;
dev->ignore_hotplug = 1;
/* Propagate the "ignore hotplug" setting to the parent bridge. */
if (bridge)
bridge->ignore_hotplug = 1;
}
EXPORT_SYMBOL_GPL(pci_ignore_hotplug);
#define RESOURCE_ALIGNMENT_PARAM_SIZE COMMAND_LINE_SIZE
static char resource_alignment_param[RESOURCE_ALIGNMENT_PARAM_SIZE] = {0};
static DEFINE_SPINLOCK(resource_alignment_lock);