mbox series

[v2,0/2] Synchronize user layer access with system PM ops and error handling

Message ID 1609479893-8889-1-git-send-email-cang@codeaurora.org (mailing list archive)
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Series Synchronize user layer access with system PM ops and error handling | expand

Message

Can Guo Jan. 1, 2021, 5:44 a.m. UTC 
This series contains two changes and it is based on 5.11/scsi-queue
The 1st change is just a minor fix.
The 2nd change is to synchronize user layer access through UFS sysfs nodes, so that system PM ops (suspend, resume and shutdown), error handling and async probe won't be disturbed by user layer access. The protection is only added to some sysfs nodes, not all of them.

Change since v1:
- Slightly updated the 2nd change, added a dedicated inline func to check hba->shutting_down in ufshcd.h. This inline func can be updated to add more rules for sysfs passage in future.

Can Guo (2):
  scsi: ufs: Fix a possible NULL pointer issue
  scsi: ufs: Protect PM ops and err_handler from user access through
    sysfs

 drivers/scsi/ufs/ufs-sysfs.c | 104 ++++++++++++++++++++++++++++++++++++-------
 drivers/scsi/ufs/ufshcd.c    |  49 ++++++++++++--------
 drivers/scsi/ufs/ufshcd.h    |  10 ++++-
 3 files changed, 128 insertions(+), 35 deletions(-)