[PATCH net 0/3] Fix i40e/iavf VF bonding after netdev lock changes

[Jose Ignacio Tornos Martinez <jtornosm@redhat.com>]

This series fixes VF bonding failures introduced by commit ad7c7b2172c3
("net: hold netdev instance lock during sysfs operations").

The core issue is lock contention: iavf_set_mac() is now called with the
netdev lock held and waits for MAC change completion while holding it.
However, the watchdog task that processes the request also needs this lock,
creating a deadlock scenario where the watchdog cannot run, causing
timeouts.

Additionally, setting VF trust triggers an unnecessary ~10 second VF reset
that delays bonding setup, even though filter synchronization happens
naturally during normal VF operation.

This series:
1. Adds safety guard to avoid waiting with locks during reset
2. Eliminates unnecessary VF reset when setting trust (major performance
   win)
3. Fixes the lock contention by dropping the lock while waiting

Testing shows VF bonding now works reliably in ~5 seconds vs 15+ seconds
before, without timeouts or errors.

Tested on Intel 700-series dual-port NIC (i40e) with iavf driver.

Thanks to Jan Tluka <jtluka@redhat.com> for reporting the issue.

Jose Ignacio Tornos Martinez (3):
  iavf: return EBUSY if reset in progress during MAC change
  i40e: skip unnecessary VF reset when setting trust
  iavf: drop netdev lock while waiting for MAC change completion

 drivers/net/ethernet/intel/i40e/i40e_virtchnl_pf.c | 12 +++++++-----
 drivers/net/ethernet/intel/iavf/iavf_main.c        | 14 ++++++++++++++
 2 files changed, 21 insertions(+), 5 deletions(-)

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2.43.0