IB/srpt: Introduce srpt_disconnect_ch_sync()

Except for changing a BUG_ON() call into a WARN_ON_ONCE() call, this
patch does not change any functionality.

Signed-off-by: Bart Van Assche <bart.vanassche@wdc.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>

diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.c b/drivers/infiniband/ulp/srpt/ib_srpt.c
index a5f232e..1aeb8d6 100644 (file)
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -1787,6 +1787,40 @@ static int srpt_disconnect_ch(struct srpt_rdma_ch *ch)
        return ret;
 }
 
+/*
+ * Send DREQ and wait for DREP. Return true if and only if this function
+ * changed the state of @ch.
+ */
+static bool srpt_disconnect_ch_sync(struct srpt_rdma_ch *ch)
+       __must_hold(&sdev->mutex)
+{
+       DECLARE_COMPLETION_ONSTACK(release_done);
+       struct srpt_device *sdev = ch->sport->sdev;
+       bool wait;
+
+       lockdep_assert_held(&sdev->mutex);
+
+       pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num,
+                ch->state);
+
+       WARN_ON(ch->release_done);
+       ch->release_done = &release_done;
+       wait = !list_empty(&ch->list);
+       srpt_disconnect_ch(ch);
+       mutex_unlock(&sdev->mutex);
+
+       if (!wait)
+               goto out;
+
+       while (wait_for_completion_timeout(&release_done, 180 * HZ) == 0)
+               pr_info("%s(%s-%d state %d): still waiting ...\n", __func__,
+                       ch->sess_name, ch->qp->qp_num, ch->state);
+
+out:
+       mutex_lock(&sdev->mutex);
+       return wait;
+}
+
 static void __srpt_close_all_ch(struct srpt_device *sdev)
 {
        struct srpt_rdma_ch *ch;
@@ -2791,27 +2825,12 @@ static void srpt_release_cmd(struct se_cmd *se_cmd)
  */
 static void srpt_close_session(struct se_session *se_sess)
 {
-       DECLARE_COMPLETION_ONSTACK(release_done);
        struct srpt_rdma_ch *ch = se_sess->fabric_sess_ptr;
        struct srpt_device *sdev = ch->sport->sdev;
-       bool wait;
-
-       pr_debug("ch %s-%d state %d\n", ch->sess_name, ch->qp->qp_num,
-                ch->state);
 
        mutex_lock(&sdev->mutex);
-       BUG_ON(ch->release_done);
-       ch->release_done = &release_done;
-       wait = !list_empty(&ch->list);
-       srpt_disconnect_ch(ch);
+       srpt_disconnect_ch_sync(ch);
        mutex_unlock(&sdev->mutex);
-
-       if (!wait)
-               return;
-
-       while (wait_for_completion_timeout(&release_done, 180 * HZ) == 0)
-               pr_info("%s(%s-%d state %d): still waiting ...\n", __func__,
-                       ch->sess_name, ch->qp->qp_num, ch->state);
 }
 
 /**