net: mana: Fix double destroy_workqueue on service rescan PCI path

net: mana: Fix double destroy_workqueue on service rescan PCI path

While testing corner cases in the driver, a use-after-free crash
was found on the service rescan PCI path.

When mana_serv_reset() calls mana_gd_suspend(), mana_gd_cleanup()
destroys gc->service_wq. If the subsequent mana_gd_resume() fails
with -ETIMEDOUT or -EPROTO, the code falls through to
mana_serv_rescan() which triggers pci_stop_and_remove_bus_device().
This invokes the PCI .remove callback (mana_gd_remove), which calls
mana_gd_cleanup() a second time, attempting to destroy the already-
freed workqueue. Fix this by NULL-checking gc->service_wq in
mana_gd_cleanup() and setting it to NULL after destruction.

Call stack of issue for reference:
[Sat Feb 21 18:53:48 2026] Call Trace:
[Sat Feb 21 18:53:48 2026]  <TASK>
[Sat Feb 21 18:53:48 2026]  mana_gd_cleanup+0x33/0x70 [mana]
[Sat Feb 21 18:53:48 2026]  mana_gd_remove+0x3a/0xc0 [mana]
[Sat Feb 21 18:53:48 2026]  pci_device_remove+0x41/0xb0
[Sat Feb 21 18:53:48 2026]  device_remove+0x46/0x70
[Sat Feb 21 18:53:48 2026]  device_release_driver_internal+0x1e3/0x250
[Sat Feb 21 18:53:48 2026]  device_release_driver+0x12/0x20
[Sat Feb 21 18:53:48 2026]  pci_stop_bus_device+0x6a/0x90
[Sat Feb 21 18:53:48 2026]  pci_stop_and_remove_bus_device+0x13/0x30
[Sat Feb 21 18:53:48 2026]  mana_do_service+0x180/0x290 [mana]
[Sat Feb 21 18:53:48 2026]  mana_serv_func+0x24/0x50 [mana]
[Sat Feb 21 18:53:48 2026]  process_one_work+0x190/0x3d0
[Sat Feb 21 18:53:48 2026]  worker_thread+0x16e/0x2e0
[Sat Feb 21 18:53:48 2026]  kthread+0xf7/0x130
[Sat Feb 21 18:53:48 2026]  ? __pfx_worker_thread+0x10/0x10
[Sat Feb 21 18:53:48 2026]  ? __pfx_kthread+0x10/0x10
[Sat Feb 21 18:53:48 2026]  ret_from_fork+0x269/0x350
[Sat Feb 21 18:53:48 2026]  ? __pfx_kthread+0x10/0x10
[Sat Feb 21 18:53:48 2026]  ret_from_fork_asm+0x1a/0x30
[Sat Feb 21 18:53:48 2026]  </TASK>

Fixes: 505cc26bcae0 ("net: mana: Add support for auxiliary device servicing events")
Reviewed-by: Haiyang Zhang <haiyangz@microsoft.com>
Signed-off-by: Dipayaan Roy <dipayanroy@linux.microsoft.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/aZ2bzL64NagfyHpg@linuxonhyperv3.guj3yctzbm1etfxqx2vob5hsef.xx.internal.cloudapp.net
Signed-off-by: Jakub Kicinski <kuba@kernel.org>