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From: Intel-wired-lan <redacted> On Behalf
Of I Viswanath
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Subject: [Intel-wired-lan] [PATCH net-next v9 1/7] net: core: Add
state tracking for async netdev ops

Async netdev ops are tricky because of the following problems:

1) Freeing the context associated with async netdev ops might require
   waiting for completion of the associated work which might require
the
   rtnl lock or the instance lock. However this will deadlock in
   __dev_close_many as the cleanup is done with those locks already
held.

2) We need a way to enable/disable async netdev ops depending on the
PM
   state to allow/prevent hardware access as appropriate.

We solve these problems by introducing a state variable to track the
current state of netdev. This can take the following values:
- ACTIVE (up and normal operation)
- DOWN (down)
- INACTIVE (in suspend/shutdown)

To solve 1, we set the state to down in __dev_close_many. In the
associated op handler, we check for the current state and return if
the netdev is down.

To solve 2, the commit introduces the following functions:
- netif_enable_async_ops  -> sets state to ACTIVE
- netif_disable_async_ops -> sets state to INACTIVE and cancels any
			     pending work as required.

The op implementation can use the state information to do the required
processing.

Signed-off-by: I Viswanath <redacted>
---
 include/linux/netdevice.h | 29 ++++++++++++++
 net/core/dev.c            | 84
++++++++++++++++++++++++++++++++++++++-
 2 files changed, 111 insertions(+), 2 deletions(-)

...

--
2.47.3

Reviewed-by: Aleksandr Loktionov <redacted>