When mana_attach() fails (e.g. during queue allocation), the error
cleanup frees apc->tx_qp and apc->rxqs and sets them to NULL. Multiple
subsequent teardown paths can then dereference these NULL pointers,
causing kernel panics.

Patch 1 adds NULL guards in the low-level teardown functions
(mana_fence_rqs, mana_destroy_vport, mana_dealloc_queues) so they are
safe to call regardless of queue initialization state. This covers all
callers: mana_remove(), mana_change_mtu() recovery, and internal error
paths in mana_alloc_queues().

Patch 2 adds an early exit in mana_detach() for already-detached ports,
making it safe for non-close callers. This allows the queue reset
handler to safely retry mana_attach() without redundant teardown.

Changes in v2:
  - Patch 2: moved netif_device_present() check into mana_detach() as
    an early exit instead of using goto in the work handler 

Dipayaan Roy (2):
  net: mana: Add NULL guards in teardown path to prevent panic on attach
    failure
  net: mana: Skip redundant detach on already-detached port

 drivers/net/ethernet/microsoft/mana/mana_en.c | 76 ++++++++++++-------
 1 file changed, 47 insertions(+), 29 deletions(-)

-- 
2.43.0