8139cp: pci_get_drvdata(pdev) can not be NULL in suspend handler
1) pci_set_drvdata() is used in cp_{init/remove}_one to initialize/reset
driver_data to the relevant value (resp. net_device * and NULL).
2) each of the 3 relevant functions is issued under (device *)->sem:
2.1) pci_unregister_driver
-> driver_unregister
-> bus_remove_driver
-> driver_detach (takes (device *)->sem)
-> __device_release_driver(dev)
-> dev->bus-remove(dev) (== pci_device_remove)
-> drv->remove(pdev) (== cp_remove_one)
[...]
pci_dev->driver = NULL;
2.2) pci_register_driver
-> __pci_register_driver
-> driver_register
-> bus_add_driver
-> driver_attach
-> __driver_attach (takes (device *)->sem)
-> driver_probe_device(drv, dev)
-> dev->bus->probe(dev) (== pci_device_probe)
-> _pci_device_probe(drv, pci_dev)
-> pci_call_probe(drv, pci_dev, id)
-> drv->probe(dev, id) (== cp_init_one)
[...]
pci_dev->driver = drv;
2.3) suspend_device (takes (device *)->sem)
-> dev->bus->suspend(dev) (== pci_device_suspend)
checking for drv = pci_dev->driver != NULL
[...]
-> drv->suspend(pci_dev, state) (== cp_suspend)
dev->sem and the state of pci_dev->driver provide the expected result.
St Mary's day was a bit rainy here.
Signed-off-by: Francois Romieu <romieu@fr.zoreil.com>
diff --git a/drivers/net/8139cp.c b/drivers/net/8139cp.c
index 94ab3c3..a123d28 100644
--- a/drivers/net/8139cp.c
+++ b/drivers/net/8139cp.c
@@ -2023,14 +2023,12 @@
#ifdef CONFIG_PM
static int cp_suspend (struct pci_dev *pdev, pm_message_t state)
{
- struct net_device *dev;
- struct cp_private *cp;
+ struct net_device *dev = pci_get_drvdata(pdev);
+ struct cp_private *cp = netdev_priv(dev);
unsigned long flags;
- dev = pci_get_drvdata (pdev);
- cp = netdev_priv(dev);
-
- if (!dev || !netif_running (dev)) return 0;
+ if (!netif_running(dev))
+ return 0;
netif_device_detach (dev);
netif_stop_queue (dev);