[bionic:linux-azure-4.15][PATCH 0/2] LP:#1882268 - [linux-azure] Request for two CIFS commits in 16.04

[Marcelo Henrique Cerri]

BugLink: https://bugs.launchpad.net/bugs/1882268

The commit id 2084ed57167c ("CIFS: Only send SMB2_NEGOTIATE command on
new TCP connections") is a clean cherry pick from upstream while
84a1f5b1cc6f ("cifs: Fix potential softlockups while refreshing DFS
cache") had to be backported to 4.15.

Both changes are already included in the 5.4 linux-azure
kernel. 2084ed57167c was included upstream in 5.1 and 84a1f5b1cc6f was
applied via an upstream stable update (LP:#1860125). 2084ed57167c
fixes commit id e99c63e4d86d ("SMB3: Fix deadlock in validate
negotiate hits reconnect") that was included to our 4.15 kernel also
via an upstream stable update.

The original author of 84a1f5b1cc6f reviewed and approved my backport
for 4.15. Microsoft reported positive results with the test kernel and
I also smoke tested it using dbench as described by LP:#1896642.

Since we don't have a direct reproducer but we have positive feedback
from Microsoft I recommend that we include these fixes only to the
4.15 linux-azure kernels for now. Later we can evaluate if we should
include them to the generic 4.15 kernel too.

---
Paulo Alcantara (SUSE) (1):
  cifs: Fix potential softlockups while refreshing DFS cache

Pavel Shilovsky (1):
  CIFS: Only send SMB2_NEGOTIATE command on new TCP connections

 fs/cifs/smb2pdu.c       | 38 ++++++++++++++++++++++++++++----------
 fs/cifs/smb2transport.c |  8 ++++++++
 2 files changed, 36 insertions(+), 10 deletions(-)

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2.25.1