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authorJane Chu <jane.chu@oracle.com>2020-08-04 01:41:39 +0300
committerVishal Verma <vishal.l.verma@intel.com>2020-08-04 03:54:13 +0300
commit7f674025d9f7321dea11b802cc0ab3f09cbe51c5 (patch)
tree58ddf824c15cac3c89789932322f67ba32fb3fb4 /drivers/nvdimm
parent7c02d53dfe4db08cd7b4d4be8c7f1b801cf8b899 (diff)
downloadlinux-7f674025d9f7321dea11b802cc0ab3f09cbe51c5.tar.xz
libnvdimm/security: ensure sysfs poll thread woke up and fetch updated attr
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>
Diffstat (limited to 'drivers/nvdimm')
-rw-r--r--drivers/nvdimm/security.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/drivers/nvdimm/security.c b/drivers/nvdimm/security.c
index acfd211c01b9..35d265014e1e 100644
--- a/drivers/nvdimm/security.c
+++ b/drivers/nvdimm/security.c
@@ -450,14 +450,19 @@ void __nvdimm_security_overwrite_query(struct nvdimm *nvdimm)
else
dev_dbg(&nvdimm->dev, "overwrite completed\n");
- if (nvdimm->sec.overwrite_state)
- sysfs_notify_dirent(nvdimm->sec.overwrite_state);
+ /*
+ * Mark the overwrite work done and update dimm security flags,
+ * then send a sysfs event notification to wake up userspace
+ * poll threads to picked up the changed state.
+ */
nvdimm->sec.overwrite_tmo = 0;
clear_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags);
clear_bit(NDD_WORK_PENDING, &nvdimm->flags);
- put_device(&nvdimm->dev);
nvdimm->sec.flags = nvdimm_security_flags(nvdimm, NVDIMM_USER);
nvdimm->sec.ext_flags = nvdimm_security_flags(nvdimm, NVDIMM_MASTER);
+ if (nvdimm->sec.overwrite_state)
+ sysfs_notify_dirent(nvdimm->sec.overwrite_state);
+ put_device(&nvdimm->dev);
}
void nvdimm_security_overwrite_query(struct work_struct *work)