[PATCH 0/2] scsi: ufs: core: Fix post-reset runtime PM recovery after eef1d74bf88f

[Stanley Jhu]

Since commit eef1d74bf88f ("PM: runtime: Only set runtime_error on
suspend callback failures"), rpm_resume() resets ufs_device_wlun to
RPM_SUSPENDED and leaves power.runtime_error at 0 when W-LUN runtime
resume fails. When error handling subsequently resets and restores the
host and link, two runtime PM recovery gaps are exposed:

1. ufshcd_err_handling_prepare() calls ufshcd_vops_resume() while
   ufs_device_wlun remains RPM_SUSPENDED, so the next ufs_device_wlun
   runtime resume calls ufshcd_vops_resume() a second consecutive time
   without an intervening ufshcd_vops_suspend(), leaking core_clk and
   iface_clk enable counts in ufs_qcom_resume() via qcom_ice_resume().
2. ufshcd_recover_pm_error() checks only power.runtime_error and skips
   consumer queue recovery, leaving waking I/O blocked in
   __bio_queue_enter() until another request touches the same queue.

Patch 1 tracks POST_CHANGE variant suspend state in
hba->is_vops_suspended so ufshcd_vops_resume() pairs 1:1 with
ufshcd_vops_suspend() across error recovery. Patch 2 wakes consumer
request queues when ufs_device_wlun is runtime-suspended in
ufshcd_recover_pm_error() so consumer pm_request_resume() resumes
ufs_device_wlun via the runtime PM device link.

This series applies on top of two prerequisite patches so repeated
post-failure W-LUN runtime resumes keep wlun q->pm_only and
clk_gating.active_reqs balanced:
- Message-ID: <20261104112744.1630864-1-stanleyjhu@xxxxxxxxxx>
  ("[PATCH v2] block: Keep RPM_ACTIVE in blk_pre_runtime_resume() when
  already active")
- Message-ID: <20261029040002.2100002-1-stanleyjhu@xxxxxxxxxx>
  ("scsi: ufs: core: Keep clock-gating hold on failed W-LUN runtime
  resume")

Tested: QEMU ARM64 UFS in SDB and MCQ modes with injected W-LUN
runtime-resume START STOP UNIT and fatal UIC error recovery, verifying
immediate consumer wake, 1:1 variant suspend/resume pairing, and idle
clock gating.

Stanley Jhu (2):
  scsi: ufs: core: Skip redundant variant resume after error recovery
    power-up
  scsi: ufs: core: Wake consumer queues on suspended W-LUN recovery

 drivers/ufs/core/ufshcd-priv.h | 21 ++++++++++++++++-----
 drivers/ufs/core/ufshcd.c      |  4 +++-
 include/ufs/ufshcd.h           |  2 ++
 3 files changed, 21 insertions(+), 6 deletions(-)

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2.56.0.385.gac671c819a-goog