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[ Upstream commit 7f674025d9f7321dea11b802cc0ab3f09cbe51c5 ]
commit 7d988097c546 ("acpi/nfit, libnvdimm/security: Add security DSM overwrite support")
adds a sysfs_notify_dirent() to wake up userspace poll thread when the "overwrite"
operation has completed. But the notification is issued before the internal
dimm security state and flags have been updated, so the userspace poll thread
wakes up and fetches the not-yet-updated attr and falls back to sleep, forever.
But if user from another terminal issue "ndctl wait-overwrite nmemX" again,
the command returns instantly.
Link: https://lore.kernel.org/r/1596494499-9852-3-git-send-email-jane.chu@oracle.com
Fixes: 7d988097c546 ("acpi/nfit, libnvdimm/security: Add security DSM overwrite support")
Cc: Dave Jiang <dave.jiang@intel.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Jane Chu <jane.chu@oracle.com>
Signed-off-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
a6d5c5a398