PCIE has a mechanism to wait for Non-Posted request to complete. I think

pci_disable_device is a good place to do this.
Signed-off-by: Shaohua Li <shaohua.li@intel.com>

---

 drivers/pci/pci.c   |   21 +++++++++++++++++++++

 include/linux/pci.h |    2 ++

 2 files changed, 23 insertions(+)
Index: linux/drivers/pci/pci.c

===================================================================

--- linux.orig/drivers/pci/pci.c	2007-10-17 10:33:48.000000000 +0800

+++ linux/drivers/pci/pci.c	2007-10-22 14:22:53.000000000 +0800

@@ -314,6 +314,24 @@ int pci_find_ht_capability(struct pci_de

 }

 EXPORT_SYMBOL_GPL(pci_find_ht_capability);
+void pcie_wait_pending_transaction(struct pci_dev *dev)

+{

+	int pos;

+	u16 reg16;

+

+	pos = pci_find_capability(dev, PCI_CAP_ID_EXP);

+	if (!pos)

+		return;

+	while (1) {

+		pci_read_config_word(dev, pos + PCI_EXP_DEVSTA, &reg16);

+		if (!(reg16 & PCI_EXP_DEVSTA_TRPND))

+			break;

+		cpu_relax();

+	}

+

+}

+EXPORT_SYMBOL_GPL(pcie_wait_pending_transaction);

+

 /**

  * pci_find_parent_resource - return resource region of parent bus of given region

  * @dev: PCI device structure contains resources to be searched

@@ -884,6 +902,9 @@ pci_disable_device(struct pci_dev *dev)

 	if (atomic_sub_return(1, &dev->enable_cnt) != 0)

 		return;
+	/* Wait for all transactions are finished before disabling the device */

+	pcie_wait_pending_transaction(dev);

+

 	pci_read_config_word(dev, PCI_COMMAND, &pci_command);

 	if (pci_command & PCI_COMMAND_MASTER) {

 		pci_command &= ~PCI_COMMAND_MASTER;

Index: linux/include/linux/pci.h

===================================================================

--- linux.orig/include/linux/pci.h	2007-10-17 10:33:52.000000000 +0800

+++ linux/include/linux/pci.h	2007-10-22 14:19:56.000000000 +0800

@@ -484,6 +484,7 @@ int pci_find_next_capability (struct pci

 int pci_find_ext_capability (struct pci_dev *dev, int cap);

 int pci_find_ht_capability (struct pci_dev *dev, int ht_cap);

 int pci_fi...
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