[SRU][Bionic][v2] Pull Request: Fixes for lp:1770003

[Joseph Salisbury]

== SRU Justification ==
IBM is requesting these nine patches to be SRU'd to Bionic.  IBM found
that the current Bionic kernel contains a problem related to qla2xxx
driver which causes the following:

#####
[ 66.295233] Unable to handle kernel paging request for data at address 0x8882f6ed90e9151a
[ 66.295297] Faulting instruction address: 0xc00000000038a110
cpu 0x50: Vector: 380 (Data Access Out of Range) at [c00000000692f650]
    pc: c00000000038a110: kmem_cache_alloc_node+0x2f0/0x350
    lr: c00000000038a0fc: kmem_cache_alloc_node+0x2dc/0x350
    sp: c00000000692f8d0
   msr: 9000000000009033
   dar: 8882f6ed90e9151a
  current = 0xc00000000698fd00
  paca = 0xc00000000fab7000 softe: 0 irq_happened: 0x01
    pid = 1762, comm = systemd-journal
Linux version 4.15.0-20-generic (buildd at bos02-ppc64el-002) (gcc version 7.3.0 (Ubuntu 7.3.0-14ubuntu1)) #16-Ubuntu SMP Wed Apr 4 13:57:51 UTC 2018 (Ubuntu 4.15.0-20.21-generic 4.15.20)
enter ? for help
[c00000000692f8d0] c000000000389fd4 kmem_cache_alloc_node+0x1b4/0x350 (unreliable)
[c00000000692f940] c000000000b2ec6c __alloc_skb+0x6c/0x220
[c00000000692f9a0] c000000000b30b6c alloc_skb_with_frags+0x7c/0x2e0
[c00000000692fa30] c000000000b247cc sock_alloc_send_pskb+0x29c/0x2c0
[c00000000692fae0] c000000000c5705c unix_dgram_sendmsg+0x15c/0x8f0
[c00000000692fbc0] c000000000b1ec64 sock_sendmsg+0x64/0x90
[c00000000692fbf0] c000000000b20abc ___sys_sendmsg+0x31c/0x390
[c00000000692fd90] c000000000b221ec __sys_sendmsg+0x5c/0xc0
[c00000000692fe30] c00000000000b184 system_call+0x58/0x6c
--- Exception: c00 (System Call) at 000074826f6fa9c4
SP (7ffff5dc5510) is in userspace
#####

Four of the patches in this pull request were back ported by IBM.  The other
five were clean picks.

== Regression Potential ==
Medium.  There are nine patches in this pull request.  They are not specific to a
paticular arch, but they are specific to qla2xxx.

== Test Case ==
A test kernel was built with these patches and tested by IBM.
IBM states the test kernel resolved the bug.




The following changes since commit d4174baeefbd0a9634291145600b90e13163f27d:

  UBUNTU: Ubuntu-4.15.0-20.21 (2018-04-23 23:56:56 -0500)

are available in the Git repository at:

  kernel.ubuntu.com:/srv/kernel.ubuntu.com/git/jsalisbury/bugs/lp1770003/ubuntu-bionic.git 

for you to fetch changes up to 35807f390479db2f61453e940a01deffa878147e:

  scsi: qla2xxx: Fixup locking for session deletion (2018-05-16 12:55:47 -0400)

----------------------------------------------------------------
Giridhar Malavali (1):
      scsi: qla2xxx: Don't call dma_free_coherent with IRQ disabled.

Hannes Reinecke (1):
      scsi: qla2xxx: Fixup locking for session deletion

Quinn Tran (6):
      scsi: qla2xxx: Fix session cleanup for N2N
      scsi: qla2xxx: Remove unused argument from qlt_schedule_sess_for_deletion()
      scsi: qla2xxx: Serialize session deletion by using work_lock
      scsi: qla2xxx: Serialize session free in qlt_free_session_done
      scsi: qla2xxx: Prevent relogin trigger from sending too many commands
      scsi: qla2xxx: Fix double free bug after firmware timeout

himanshu.madhani at cavium.com (1):
      scsi: qla2xxx: Fix warning in qla2x00_async_iocb_timeout()

 drivers/scsi/qla2xxx/qla_def.h    |  17 +-
 drivers/scsi/qla2xxx/qla_fw.h     |   2 +-
 drivers/scsi/qla2xxx/qla_gbl.h    |   3 +-
 drivers/scsi/qla2xxx/qla_gs.c     |  17 +-
 drivers/scsi/qla2xxx/qla_init.c   | 231 ++++++++++++++-----------
 drivers/scsi/qla2xxx/qla_isr.c    |   8 +-
 drivers/scsi/qla2xxx/qla_mbx.c    |  38 ++++-
 drivers/scsi/qla2xxx/qla_os.c     |  56 +++++--
 drivers/scsi/qla2xxx/qla_target.c | 343 +++++++++++++++++++++++++-------------
 9 files changed, 466 insertions(+), 249 deletions(-)