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net: core: try to runtime-resume detached device in __dev_open 

A netdevice may be marked as detached because the parent is
runtime-suspended and not accessible whilst interface or link is down.
An example are PCI network devices that go into PCI D3hot, see e.g.
__igc_shutdown() or rtl8169_net_suspend().
If netdevice is down and marked as detached we can only open it if
we runtime-resume it before __dev_open() calls netif_device_present().

Therefore, if netdevice is detached, try to runtime-resume the parent
and only return with an error if it's still detached.

Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Heiner Kallweit 2020-06-20 22:35:42 +02:00 committed by David S. Miller
parent 8878adba6a
commit bd869245a3
1 changed files with 8 additions and 2 deletions
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6
net/core/dev.c
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@ -143,6 +143,7 @@
#include <linux/net_namespace.h>
#include <linux/indirect_call_wrapper.h>
#include <net/devlink.h>
#include <linux/pm_runtime.h>
#include "net-sysfs.h"
@ -1492,8 +1493,13 @@ static int __dev_open(struct net_device *dev, struct netlink_ext_ack *extack)
ASSERT_RTNL();
if (!netif_device_present(dev)) {
/* may be detached because parent is runtime-suspended */
if (dev->dev.parent)
pm_runtime_resume(dev->dev.parent);
if (!netif_device_present(dev))
return -ENODEV;
}
/* Block netpoll from trying to do any rx path servicing.
* If we don't do this there is a chance ndo_poll_controller