[PATCH v2] nvme/core: Check for Security send/recv support before issuing commands.

[scott.bauer@intel.com (Scott Bauer)]

We need to verify that the controller supports the security
commands before actually trying to issue them.

Signed-off-by: Scott Bauer <scott.bauer at intel.com>
---
 drivers/nvme/host/core.c | 4 ++++
 drivers/nvme/host/nvme.h | 1 +
 include/linux/nvme.h     | 1 +
 3 files changed, 6 insertions(+)

diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c
index 8aeb4a6..5e0cf2b 100644
--- a/drivers/nvme/host/core.c
+++ b/drivers/nvme/host/core.c
@@ -1091,6 +1091,9 @@ int nvme_sec_submit(void *data, u16 spsp, u8 secp, void *buffer, size_t len,
 	struct nvme_ctrl *ctrl = data;
 	struct nvme_command cmd;
 
+	if (!(ctrl->oacs & NVME_CTRL_OACS_SEC_SUPP))
+		return -EOPNOTSUPP;
+
 	memset(&cmd, 0, sizeof(cmd));
 	if (send)
 		cmd.common.opcode = nvme_admin_security_send;
@@ -1285,6 +1288,7 @@ int nvme_init_identify(struct nvme_ctrl *ctrl)
 		return -EIO;
 	}
 
+	ctrl->oacs = le16_to_cpu(id->oacs);
 	ctrl->vid = le16_to_cpu(id->vid);
 	ctrl->oncs = le16_to_cpup(&id->oncs);
 	atomic_set(&ctrl->abort_limit, id->acl + 1);
diff --git a/drivers/nvme/host/nvme.h b/drivers/nvme/host/nvme.h
index 5126c4b..14cfc6f 100644
--- a/drivers/nvme/host/nvme.h
+++ b/drivers/nvme/host/nvme.h
@@ -140,6 +140,7 @@ struct nvme_ctrl {
 	u32 max_hw_sectors;
 	u16 oncs;
 	u16 vid;
+	u16 oacs;
 	atomic_t abort_limit;
 	u8 event_limit;
 	u8 vwc;
diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index 3e2ed49..0b676a0 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -244,6 +244,7 @@ enum {
 	NVME_CTRL_ONCS_DSM			= 1 << 2,
 	NVME_CTRL_ONCS_WRITE_ZEROES		= 1 << 3,
 	NVME_CTRL_VWC_PRESENT			= 1 << 0,
+	NVME_CTRL_OACS_SEC_SUPP                 = 1 << 0,
 };
 
 struct nvme_lbaf {
-- 
2.7.4