[PATCH 3/6] PCI: Destroy pci dev only once

[Yinghai Lu <yinghai@kernel.org>]

Mutliple removing via /sys will call pci_destroy_dev two times.

Add is_removed to record if pci_destroy_dev is called already.

During second calling, still have extra dev ref hold via
device_schedule_call, so we are safe to check dev->is_removed.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
 drivers/pci/remove.c | 5 ++++-
 include/linux/pci.h  | 1 +
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/remove.c b/drivers/pci/remove.c
index 0d2c36f..cffe269 100644
--- a/drivers/pci/remove.c
+++ b/drivers/pci/remove.c
@@ -20,7 +20,10 @@ static void pci_stop_dev(struct pci_dev *dev)
 
 static void pci_destroy_dev(struct pci_dev *dev)
 {
-	put_device(&dev->dev);
+	if (!dev->is_removed) {
+		dev->is_removed = 1;
+		put_device(&dev->dev);
+	}
 }
 
 void pci_remove_bus(struct pci_bus *bus)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 1084a15..ccb316d 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -321,6 +321,7 @@ struct pci_dev {
 	unsigned int	multifunction:1;/* Part of multi-function device */
 	/* keep track of device state */
 	unsigned int	is_added:1;
+	unsigned int	is_removed:1;	/* pci_destroy_dev is called */
 	unsigned int	is_busmaster:1; /* device is busmaster */
 	unsigned int	no_msi:1;	/* device may not use msi */
 	unsigned int	block_cfg_access:1;	/* config space access is blocked */
-- 
1.8.1.4