linux-kernel - [PATCH 13/13] PCI: Disable mem in the ioapic removing path

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Date:	Thu, 23 Feb 2012 19:48:59 -0800
From:	Yinghai Lu <yinghai@...nel.org>
To:	Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...e.hu>,
	"H. Peter Anvin" <hpa@...or.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Yinghai Lu <yinghai@...nel.org>
Subject: [PATCH 13/13] PCI: Disable mem in the ioapic removing path

For physical hot plug should be ok, but for remove/rescan path will need us
to disable that.

otherwise rescan mmio resource for pci ioapic device will not be sized and
allocated, aka skiped.
For ioapic_probe:pci_enable_device will not enable the device correctly, and
will bail out early.

So we can just disable mmio for all removing case. that will hurt real hotplug
path.

Signed-off-by: <yinghai@...nel.org>
Cc: Jesse Barnes <jbarnes@...tuousgeek.org>
---
 drivers/pci/ioapic.c |   13 +++++++++++++
 1 files changed, 13 insertions(+), 0 deletions(-)

diff --git a/drivers/pci/ioapic.c b/drivers/pci/ioapic.c
index 4183a5c..0b2c210 100644
--- a/drivers/pci/ioapic.c
+++ b/drivers/pci/ioapic.c
@@ -88,6 +88,17 @@ exit_free:
 	return -ENODEV;
 }
 
+static void pci_disable_device_mem(struct pci_dev *dev)
+{
+	u16 pci_command;
+
+	pci_read_config_word(dev, PCI_COMMAND, &pci_command);
+	if (pci_command & PCI_COMMAND_MEMORY) {
+		pci_command &= ~PCI_COMMAND_MEMORY;
+		pci_write_config_word(dev, PCI_COMMAND, pci_command);
+	}
+}
+
 static void __devexit ioapic_remove(struct pci_dev *dev)
 {
 	struct ioapic *ioapic = pci_get_drvdata(dev);
@@ -95,6 +106,8 @@ static void __devexit ioapic_remove(struct pci_dev *dev)
 	acpi_unregister_ioapic(ioapic->handle, ioapic->gsi_base);
 	pci_release_region(dev, 0);
 	pci_disable_device(dev);
+	/* need to disable it, otherwise remove/rescan will not work */
+	pci_disable_device_mem(dev);
 	kfree(ioapic);
 }
 
-- 
1.7.7

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