[PATCH v2] libnvdimm: prevent nvdimm from requesting key when security is disabled

From: Dave Jiang <dave.jiang@intel.com>
To: dan.j.williams@intel.com
Cc: jthumshirn@suse.com, peter.stark@ts.fujitsu.com,
	linux-nvdimm@lists.01.org
Subject: [PATCH v2] libnvdimm: prevent nvdimm from requesting key when security is disabled
Date: Tue, 24 Sep 2019 10:34:49 -0700	[thread overview]
Message-ID: <156934642272.30222.5230162488753445916.stgit@djiang5-desk3.ch.intel.com> (raw)

Current implementation attempts to request keys from the keyring even when
security is not enabled. Change behavior so when security is disabled it
will skip key request.

Error messages seen when no keys are installed and libnvdimm is loaded:

request-key[4598]: Cannot find command to construct key 661489677
request-key[4606]: Cannot find command to construct key 34713726
...

Fixes: 4c6926a23b76 ("acpi/nfit, libnvdimm: Add unlock of nvdimm support for Intel DIMMs")

Cc: stable@vger.kernel.org
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
---

v2:
- Fix up commit header to add more information and cc stable. (Dan)

 drivers/nvdimm/security.c |    4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/nvdimm/security.c b/drivers/nvdimm/security.c
index 9e45b207ff01..89b85970912d 100644
--- a/drivers/nvdimm/security.c
+++ b/drivers/nvdimm/security.c
@@ -177,6 +177,10 @@ static int __nvdimm_security_unlock(struct nvdimm *nvdimm)
 			|| !nvdimm->sec.flags)
 		return -EIO;
 
+	/* No need to go further if security is disabled */
+	if (test_bit(NVDIMM_SECURITY_DISABLED, &nvdimm->sec.flags))
+		return 0;
+
 	if (test_bit(NDD_SECURITY_OVERWRITE, &nvdimm->flags)) {
 		dev_dbg(dev, "Security operation in progress.\n");
 		return -EBUSY;

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