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| author | Heiner Kallweit <hkallweit1@gmail.com> | 2020-06-20 22:35:42 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2020-06-22 16:26:01 -0700 |
| commit | bd869245a3dcca1c8a77dfade7d3dc69a68365df (patch) | |
| tree | 01a196cd89ea629ca56643d907765318c0bf9586 /net/core | |
| parent | 8878adba6ab5414c36b693e09fe46c4416072cc7 (diff) | |
| download | linux-bd869245a3dcca1c8a77dfade7d3dc69a68365df.tar.bz2 | |
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>
Diffstat (limited to 'net/core')
| -rw-r--r-- | net/core/dev.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/net/core/dev.c b/net/core/dev.c index cea7fc1716ca..c5ec4d50acd1 100644 --- a/net/core/dev.c +++ b/net/core/dev.c @@ -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)) - return -ENODEV; + 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 |