[PULL REQUEST][focal/linux-azure] Fix race on per-CQ variable napi work_done

[Tim Gardner]

SRU Justification

https://bugs.launchpad.net/bugs/2003353

[Impact]

This patch [1]1 is requested by MSFT Linux Systems Group to fix a race 
condition that can cause a panic in napi_iperf().

[1] - 
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=18010ff776fa42340efc428b3ea6d19b3e7c7b21

A number of prerequisite patches are required. v5.15.83 contains this 
patch, however v5.19 stable does not.

[Test Case]

MSFT tested and approved, "Please merge in both the kernels, LSG 
finished the validation".

[Where things could go wrong]

Test results are good. Regression potential seems low.

[Other Info]

SF: #00350135

----------------------------------------------------------------

The following changes since commit f02acc2610ccac22acaa1713e8f767e7504fe72d:

   UBUNTU: Ubuntu-azure-5.4.0-1102.108 (2023-01-17 08:58:09 -0700)

are available in the Git repository at:

   git://git.launchpad.net/~timg-tpi/ubuntu/+source/linux/+git/focal 
focal-azure-Fix-race-on-per-CQ-variable-napi_iperf-panic-fix-sf00350135

for you to fetch changes up to 061b7c9da6bc794e26802178cf2edfe38087f52c:

   net: mana: Fix race on per-CQ variable napi work_done (2023-01-19 
08:01:48 -0700)

----------------------------------------------------------------
Christophe JAILLET (1):
       net: mana: Fix a memory leak in an error handling path in 
'mana_create_txq()'

Gustavo A. R. Silva (1):
       net: mana: Use struct_size() in kzalloc()

Haiyang Zhang (5):
       net: mana: Move NAPI from EQ to CQ
       net: mana: Add support for EQ sharing
       net: mana: Add WARN_ON_ONCE in case of CQE read overflow
       net: mana: Fix error handling in mana_create_rxq()
       net: mana: Fix race on per-CQ variable napi work_done

Len Baker (1):
       net: mana: Prefer struct_size over open coded arithmetic

  drivers/net/ethernet/microsoft/mana/gdma.h       |  39 +++++++++------
  drivers/net/ethernet/microsoft/mana/gdma_main.c  |  88 
+++++++++++-----------------------
  drivers/net/ethernet/microsoft/mana/hw_channel.c |   6 +--
  drivers/net/ethernet/microsoft/mana/mana.h       |  29 +++++++-----
  drivers/net/ethernet/microsoft/mana/mana_en.c    | 183 
+++++++++++++++++++++++++++++++++++++++++------------------------------
  5 files changed, 176 insertions(+), 169 deletions(-)
-- 
-----------
Tim Gardner
Canonical, Inc