提交 f50791ac 编写于 作者: E Eugene Shatokhin 提交者: David S. Miller

usbnet: Get EVENT_NO_RUNTIME_PM bit before it is cleared

It is needed to check EVENT_NO_RUNTIME_PM bit of dev->flags in
usbnet_stop(), but its value should be read before it is cleared
when dev->flags is set to 0.

The problem was spotted and the fix was provided by
Oliver Neukum <oneukum@suse.de>.
Signed-off-by: NEugene Shatokhin <eugene.shatokhin@rosalab.ru>
Acked-by: NOliver Neukum <oneukum@suse.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>
上级 ccc02ddb
......@@ -778,7 +778,7 @@ int usbnet_stop (struct net_device *net)
{
struct usbnet *dev = netdev_priv(net);
struct driver_info *info = dev->driver_info;
int retval, pm;
int retval, pm, mpn;
clear_bit(EVENT_DEV_OPEN, &dev->flags);
netif_stop_queue (net);
......@@ -809,6 +809,8 @@ int usbnet_stop (struct net_device *net)
usbnet_purge_paused_rxq(dev);
mpn = !test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags);
/* deferred work (task, timer, softirq) must also stop.
* can't flush_scheduled_work() until we drop rtnl (later),
* else workers could deadlock; so make workers a NOP.
......@@ -819,8 +821,7 @@ int usbnet_stop (struct net_device *net)
if (!pm)
usb_autopm_put_interface(dev->intf);
if (info->manage_power &&
!test_and_clear_bit(EVENT_NO_RUNTIME_PM, &dev->flags))
if (info->manage_power && mpn)
info->manage_power(dev, 0);
else
usb_autopm_put_interface(dev->intf);
......
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