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usbnet: Get EVENT_NO_RUNTIME_PM bit before it is cleared

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[ Upstream commit f50791ac1aca1ac1b0370d62397b43e9f831421a ]

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: Eugene Shatokhin <eugene.shatokhin@rosalab.ru>
Acked-by: Oliver Neukum <oneukum@suse.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Eugene Shatokhin 2015-08-24 23:13:42 +03:00 committed by Greg Kroah-Hartman
parent 6d8c190531
commit fe474009a2
1 changed files with 4 additions and 3 deletions
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7
drivers/net/usb/usbnet.c
View file

@ -753,7 +753,7 @@ 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);
@ -784,6 +784,8 @@ 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.
@ -794,8 +796,7 @@ 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);