[PATCH v2 00/19] scsi: libsas: Remove in_interrupt() check

[Ahmed S. Darwish]

Hi,

Changelog v2
------------

- Rebase on top of v5.11-rc3

- Rebase on top of John's patch "scsi: libsas and users: Remove notifier
  indirection", as it affects every other patch. Include it in this
  series (patch #2).

- Introduce patches #13 => #19, which modify call sites back to use the
  original libsas notifier function names without _gfp() suffix.

- Collect r-b tags

v1 Submission
-------------

  https://lkml.kernel.org/r/20201218204354.586951-1-a.darwish@xxxxxxxxxxxxx

Cover letter
------------

In the discussion about preempt count consistency across kernel
configurations:

  https://lkml.kernel.org/r/20200914204209.256266093@xxxxxxxxxxxxx

it was concluded that the usage of in_interrupt() and related context
checks should be removed from non-core code.

This includes memory allocation mode decisions (GFP_*). In the long run,
usage of in_interrupt() and its siblings should be banned from driver
code completely.

This series addresses SCSI libsas. Basically, the function:

  => drivers/scsi/libsas/sas_init.c:
  struct asd_sas_event *sas_alloc_event(struct asd_sas_phy *phy)
  {
        ...
        gfp_t flags = in_interrupt() ? GFP_ATOMIC : GFP_KERNEL;
        event = kmem_cache_zalloc(sas_event_cache, flags);
        ...
  }

is transformed so that callers explicitly pass the gfp_t memory
allocation flags. Affected libsas clients are modified accordingly.

Patches #1, #2 => #7 have "Fixes: " tags and address bugs the were
noticed during the context analysis.

Thanks!

8<--------------

Ahmed S. Darwish (18):
  Documentation: scsi: libsas: Remove notify_ha_event()
  scsi: libsas: Introduce a _gfp() variant of event notifiers
  scsi: mvsas: Pass gfp_t flags to libsas event notifiers
  scsi: isci: port: link down: Pass gfp_t flags
  scsi: isci: port: link up: Pass gfp_t flags
  scsi: isci: port: broadcast change: Pass gfp_t flags
  scsi: libsas: Pass gfp_t flags to event notifiers
  scsi: pm80xx: Pass gfp_t flags to libsas event notifiers
  scsi: aic94xx: Pass gfp_t flags to libsas event notifiers
  scsi: hisi_sas: Pass gfp_t flags to libsas event notifiers
  scsi: libsas: event notifiers API: Add gfp_t flags parameter
  scsi: hisi_sas: Switch back to original libsas event notifiers
  scsi: aic94xx: Switch back to original libsas event notifiers
  scsi: pm80xx: Switch back to original libsas event notifiers
  scsi: libsas: Switch back to original event notifiers API
  scsi: isci: Switch back to original libsas event notifiers
  scsi: mvsas: Switch back to original libsas event notifiers
  scsi: libsas: Remove temporarily-added _gfp() API variants

John Garry (1):
  scsi: libsas and users: Remove notifier indirection

 Documentation/scsi/libsas.rst          |  5 ++--
 drivers/scsi/aic94xx/aic94xx_scb.c     | 20 ++++++-------
 drivers/scsi/hisi_sas/hisi_sas.h       |  3 +-
 drivers/scsi/hisi_sas/hisi_sas_main.c  | 29 +++++++++----------
 drivers/scsi/hisi_sas/hisi_sas_v1_hw.c |  6 ++--
 drivers/scsi/hisi_sas/hisi_sas_v2_hw.c |  6 ++--
 drivers/scsi/hisi_sas/hisi_sas_v3_hw.c |  6 ++--
 drivers/scsi/isci/port.c               | 11 +++----
 drivers/scsi/libsas/sas_event.c        | 27 ++++++++---------
 drivers/scsi/libsas/sas_init.c         | 17 ++++-------
 drivers/scsi/libsas/sas_internal.h     |  5 ++--
 drivers/scsi/mvsas/mv_sas.c            | 24 +++++++---------
 drivers/scsi/pm8001/pm8001_hwi.c       | 40 ++++++++++++--------------
 drivers/scsi/pm8001/pm8001_sas.c       | 12 +++-----
 drivers/scsi/pm8001/pm80xx_hwi.c       | 37 +++++++++++-------------
 include/scsi/libsas.h                  |  9 +++---
 16 files changed, 115 insertions(+), 142 deletions(-)

base-commit: 7c53f6b671f4aba70ff15e1b05148b10d58c2837
--
2.30.0