[PATCH 4.19 09/88] nvmet: Disable keep-alive timer when kato is cleared to 0h

[Greg Kroah-Hartman]

From: Amit Engel <amit.en...@dell.com>

[ Upstream commit 0d3b6a8d213a30387b5104b2fb25376d18636f23 ]

Based on nvme spec, when keep alive timeout is set to zero
the keep-alive timer should be disabled.

Signed-off-by: Amit Engel <amit.en...@dell.com>
Signed-off-by: Sagi Grimberg <s...@grimberg.me>
Signed-off-by: Jens Axboe <ax...@kernel.dk>
Signed-off-by: Sasha Levin <sas...@kernel.org>
---
 drivers/nvme/target/core.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/nvme/target/core.c b/drivers/nvme/target/core.c
index 776b7e9e23b9e..f28df233dfcd0 100644
--- a/drivers/nvme/target/core.c
+++ b/drivers/nvme/target/core.c
@@ -307,6 +307,9 @@ static void nvmet_keep_alive_timer(struct work_struct *work)
 
 static void nvmet_start_keep_alive_timer(struct nvmet_ctrl *ctrl)
 {
+       if (unlikely(ctrl->kato == 0))
+               return;
+
        pr_debug("ctrl %d start keep-alive timer for %d secs\n",
                ctrl->cntlid, ctrl->kato);
 
@@ -316,6 +319,9 @@ static void nvmet_start_keep_alive_timer(struct nvmet_ctrl 
*ctrl)
 
 static void nvmet_stop_keep_alive_timer(struct nvmet_ctrl *ctrl)
 {
+       if (unlikely(ctrl->kato == 0))
+               return;
+
        pr_debug("ctrl %d stop keep-alive\n", ctrl->cntlid);
 
        cancel_delayed_work_sync(&ctrl->ka_work);
-- 
2.25.1