This patch fixes breakage of of enable_cnt in quirk_resource_alignment.
Current quirk_resource_alignment calls pci_disable_device.
pci_disable_device decrements enable_cnt, so that enable_cnt becomes -1.
The patch disables memory decoding, writing command register directly.
So enable_cnt is not broken.
v1 -> v2
- Fix a message.
Thanks,
--
Yuji Shimada
Signed-off-by: Yuji Shimada <shimada-yxb@xxxxxxxxxxxxxxx>
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 9b2f0d9..755dd32 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -36,17 +36,18 @@ EXPORT_SYMBOL(pcie_mch_quirk);
#ifdef CONFIG_PCI_QUIRKS
/*
- * This quirk function disables the device and releases resources
- * which is specified by kernel's boot parameter 'pci=resource_alignment='.
+ * This quirk function disables memory decoding and releases memory resources
+ * of the device specified by kernel's boot parameter 'pci=resource_alignment='.
* It also rounds up size to specified alignment.
* Later on, the kernel will assign page-aligned memory resource back
- * to that device.
+ * to the device.
*/
static void __devinit quirk_resource_alignment(struct pci_dev *dev)
{
int i;
struct resource *r;
resource_size_t align, size;
+ u16 command;
if (!pci_is_reassigndev(dev))
return;
@@ -58,8 +59,11 @@ static void __devinit quirk_resource_alignment(struct pci_dev *dev)
return;
}
- dev_info(&dev->dev, "Disabling device and release resources.\n");
- pci_disable_device(dev);
+ dev_info(&dev->dev,
+ "Disabling memory decoding and releasing memory resources.\n");
+ pci_read_config_word(dev, PCI_COMMAND, &command);
+ command &= ~PCI_COMMAND_MEMORY;
+ pci_write_config_word(dev, PCI_COMMAND, command);
align = pci_specified_resource_alignment(dev);
for (i=0; i < PCI_BRIDGE_RESOURCES; i++) {
--
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