RDMA/efa: Remove unneeded admin commands abort flow

The admin commands abort flow is buggy (use-after-free) and not really
necessary as it is guaranteed that after ib_unregister_device() is called
there are no user verbs threads running in parallel, delete it.

Suggested-by: Jason Gunthorpe <jgg@ziepe.ca>
Reviewed-by: Firas JahJah <firasj@amazon.com>
Reviewed-by: Yossi Leybovich <sleybo@amazon.com>
Signed-off-by: Gal Pressman <galpress@amazon.com>
Signed-off-by: Jason Gunthorpe <jgg@mellanox.com>

diff --git a/drivers/infiniband/hw/efa/efa_com.c b/drivers/infiniband/hw/efa/efa_com.c
index a5c7887..ec04ced 100644 (file)
--- a/drivers/infiniband/hw/efa/efa_com.c
+++ b/drivers/infiniband/hw/efa/efa_com.c
@@ -39,8 +39,6 @@
 enum efa_cmd_status {
        EFA_CMD_SUBMITTED,
        EFA_CMD_COMPLETED,
-       /* Abort - canceled by the driver */
-       EFA_CMD_ABORTED,
 };
 
 struct efa_comp_ctx {
@@ -532,16 +530,6 @@ static int efa_com_wait_and_process_admin_cq_polling(struct efa_comp_ctx *comp_c
                msleep(aq->poll_interval);
        }
 
-       if (comp_ctx->status == EFA_CMD_ABORTED) {
-               ibdev_err(aq->efa_dev, "Command was aborted\n");
-               atomic64_inc(&aq->stats.aborted_cmd);
-               err = -ENODEV;
-               goto out;
-       }
-
-       WARN_ONCE(comp_ctx->status != EFA_CMD_COMPLETED,
-                 "Invalid completion status %d\n", comp_ctx->status);
-
        err = efa_com_comp_status_to_errno(comp_ctx->comp_status);
 out:
        efa_com_put_comp_ctx(aq, comp_ctx);
@@ -666,66 +654,6 @@ int efa_com_cmd_exec(struct efa_com_admin_queue *aq,
 }
 
 /**
- * efa_com_abort_admin_commands - Abort all the outstanding admin commands.
- * @edev: EFA communication layer struct
- *
- * This method aborts all the outstanding admin commands.
- * The caller should then call efa_com_wait_for_abort_completion to make sure
- * all the commands were completed.
- */
-static void efa_com_abort_admin_commands(struct efa_com_dev *edev)
-{
-       struct efa_com_admin_queue *aq = &edev->aq;
-       struct efa_comp_ctx *comp_ctx;
-       unsigned long flags;
-       u16 i;
-
-       spin_lock(&aq->sq.lock);
-       spin_lock_irqsave(&aq->cq.lock, flags);
-       for (i = 0; i < aq->depth; i++) {
-               comp_ctx = efa_com_get_comp_ctx(aq, i, false);
-               if (!comp_ctx)
-                       break;
-
-               comp_ctx->status = EFA_CMD_ABORTED;
-
-               complete(&comp_ctx->wait_event);
-       }
-       spin_unlock_irqrestore(&aq->cq.lock, flags);
-       spin_unlock(&aq->sq.lock);
-}
-
-/**
- * efa_com_wait_for_abort_completion - Wait for admin commands abort.
- * @edev: EFA communication layer struct
- *
- * This method wait until all the outstanding admin commands will be completed.
- */
-static void efa_com_wait_for_abort_completion(struct efa_com_dev *edev)
-{
-       struct efa_com_admin_queue *aq = &edev->aq;
-       int i;
-
-       /* all mine */
-       for (i = 0; i < aq->depth; i++)
-               down(&aq->avail_cmds);
-
-       /* let it go */
-       for (i = 0; i < aq->depth; i++)
-               up(&aq->avail_cmds);
-}
-
-static void efa_com_admin_flush(struct efa_com_dev *edev)
-{
-       struct efa_com_admin_queue *aq = &edev->aq;
-
-       clear_bit(EFA_AQ_STATE_RUNNING_BIT, &aq->state);
-
-       efa_com_abort_admin_commands(edev);
-       efa_com_wait_for_abort_completion(edev);
-}
-
-/**
  * efa_com_admin_destroy - Destroy the admin and the async events queues.
  * @edev: EFA communication layer struct
  */
@@ -737,7 +665,7 @@ void efa_com_admin_destroy(struct efa_com_dev *edev)
        struct efa_com_admin_sq *sq = &aq->sq;
        u16 size;
 
-       efa_com_admin_flush(edev);
+       clear_bit(EFA_AQ_STATE_RUNNING_BIT, &aq->state);
 
        devm_kfree(edev->dmadev, aq->comp_ctx_pool);
        devm_kfree(edev->dmadev, aq->comp_ctx);

diff --git a/drivers/infiniband/hw/efa/efa_com.h b/drivers/infiniband/hw/efa/efa_com.h
index 84d9672..c67dd81 100644 (file)
--- a/drivers/infiniband/hw/efa/efa_com.h
+++ b/drivers/infiniband/hw/efa/efa_com.h
@@ -45,7 +45,6 @@ struct efa_com_admin_sq {
 
 /* Don't use anything other than atomic64 */
 struct efa_com_stats_admin {
-       atomic64_t aborted_cmd;
        atomic64_t submitted_cmd;
        atomic64_t completed_cmd;
        atomic64_t no_completion;