[PATCH v3 1/2] nvmet-rdma: Don't flush system_wq by default during remove_one

[PATCH v3 1/2] nvmet-rdma: Don't flush system_wq by default during remove_one

[Max Gurtovoy]

The .remove_one function is called for any ib_device removal.
In case the removed device has no reference in our driver, there
is no need to flush the system work queue.

Reviewed-by: Israel Rukshin <israelr at mellanox.com>
Signed-off-by: Max Gurtovoy <maxg at mellanox.com>
---

Changes from v2:
 - remove wrong WARNING in case device not found

Changes from v1:
 - check for the ib_device in the device list
---
 drivers/nvme/target/rdma.c | 19 ++++++++++++++++++-
 1 file changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/nvme/target/rdma.c b/drivers/nvme/target/rdma.c
index 978e169..1d873f7 100644
--- a/drivers/nvme/target/rdma.c
+++ b/drivers/nvme/target/rdma.c
@@ -1460,8 +1460,25 @@ static void nvmet_rdma_remove_port(struct nvmet_port *port)
 static void nvmet_rdma_remove_one(struct ib_device *ib_device, void *client_data)
 {
 	struct nvmet_rdma_queue *queue, *tmp;
+	struct nvmet_rdma_device *ndev;
+	bool found = false;
+
+	mutex_lock(&device_list_mutex);
+	list_for_each_entry(ndev, &device_list, entry) {
+		if (ndev->device == ib_device) {
+			found = true;
+			break;
+		}
+	}
+	mutex_unlock(&device_list_mutex);
+
+	if (!found)
+		return;
 
-	/* Device is being removed, delete all queues using this device */
+	/*
+	 * IB Device that is used by nvmet controllers is being removed,
+	 * delete all queues using this device.
+	 */
 	mutex_lock(&nvmet_rdma_queue_mutex);
 	list_for_each_entry_safe(queue, tmp, &nvmet_rdma_queue_list,
 				 queue_list) {
-- 
1.8.3.1

[PATCH v3 2/2] nvme-rdma: Don't flush delete_wq by default during remove_one

[Max Gurtovoy]

The .remove_one function is called for any ib_device removal.
In case the removed device has no reference in our driver, there
is no need to flush the work queue.

Reviewed-by: Israel Rukshin <israelr at mellanox.com>
Signed-off-by: Max Gurtovoy <maxg at mellanox.com>
---

Changes from v2:
 - remove wrong WARNING in case device not found

Changes from v1:
 - check for the ib_device in the device list

---
 drivers/nvme/host/rdma.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/drivers/nvme/host/rdma.c b/drivers/nvme/host/rdma.c
index 3a51ed5..40fff53 100644
--- a/drivers/nvme/host/rdma.c
+++ b/drivers/nvme/host/rdma.c
@@ -2025,6 +2025,20 @@ static struct nvme_ctrl *nvme_rdma_create_ctrl(struct device *dev,
 static void nvme_rdma_remove_one(struct ib_device *ib_device, void *client_data)
 {
 	struct nvme_rdma_ctrl *ctrl;
+	struct nvme_rdma_device *ndev;
+	bool found = false;
+
+	mutex_lock(&device_list_mutex);
+	list_for_each_entry(ndev, &device_list, entry) {
+		if (ndev->dev == ib_device) {
+			found = true;
+			break;
+		}
+	}
+	mutex_unlock(&device_list_mutex);
+
+	if (!found)
+		return;
 
 	/* Delete all controllers using this device */
 	mutex_lock(&nvme_rdma_ctrl_mutex);
-- 
1.8.3.1

[PATCH v3 1/2] nvmet-rdma: Don't flush system_wq by default during remove_one

[Sagi Grimberg]

Looks fine,

Reviewed-by: Sagi Grimberg <sagi at grimberg.me>

[PATCH v3 2/2] nvme-rdma: Don't flush delete_wq by default during remove_one

[Sagi Grimberg]

Looks fine,

Reviewed-by: Sagi Grimberg <sagi at grimberg.me>

[PATCH v3 1/2] nvmet-rdma: Don't flush system_wq by default during remove_one

[Keith Busch]

Thanks, series applied for 4.17 with Sagi's review.