IB/srp: Factor out common request reset code

Misc cleanups in ib_srp:
1) I think that it is more efficient to move the req entries from req_list
   to free_list in srp_reconnect_target (rather than rebuild the free_list).
   (In any case this code is shorter).
2) This allows us to reuse code in srp_reset_device and srp_reconnect_target
   and call a new function srp_reset_req.

Signed-off-by: Ishai Rabinovitz <ishai@mellanox.co.il>
Signed-off-by: Roland Dreier <rolandd@cisco.com>

diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index e7fa8b6..4e22afe 100644 (file)
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -471,14 +471,26 @@ static void srp_unmap_data(struct scsi_cmnd *scmnd,
                     scmnd->sc_data_direction);
 }
 
+static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
+{
+       srp_unmap_data(req->scmnd, target, req);
+       list_move_tail(&req->list, &target->free_reqs);
+}
+
+static void srp_reset_req(struct srp_target_port *target, struct srp_request *req)
+{
+       req->scmnd->result = DID_RESET << 16;
+       req->scmnd->scsi_done(req->scmnd);
+       srp_remove_req(target, req);
+}
+
 static int srp_reconnect_target(struct srp_target_port *target)
 {
        struct ib_cm_id *new_cm_id;
        struct ib_qp_attr qp_attr;
-       struct srp_request *req;
+       struct srp_request *req, *tmp;
        struct ib_wc wc;
        int ret;
-       int i;
 
        spin_lock_irq(target->scsi_host->host_lock);
        if (target->state != SRP_TARGET_LIVE) {
@@ -514,19 +526,12 @@ static int srp_reconnect_target(struct srp_target_port *target)
        while (ib_poll_cq(target->cq, 1, &wc) > 0)
                ; /* nothing */
 
-       list_for_each_entry(req, &target->req_queue, list) {
-               req->scmnd->result = DID_RESET << 16;
-               req->scmnd->scsi_done(req->scmnd);
-               srp_unmap_data(req->scmnd, target, req);
-       }
+       list_for_each_entry_safe(req, tmp, &target->req_queue, list)
+               srp_reset_req(target, req);
 
        target->rx_head  = 0;
        target->tx_head  = 0;
        target->tx_tail  = 0;
-       INIT_LIST_HEAD(&target->free_reqs);
-       INIT_LIST_HEAD(&target->req_queue);
-       for (i = 0; i < SRP_SQ_SIZE; ++i)
-               list_add_tail(&target->req_ring[i].list, &target->free_reqs);
 
        ret = srp_connect_target(target);
        if (ret)
@@ -726,12 +731,6 @@ static int srp_map_data(struct scsi_cmnd *scmnd, struct srp_target_port *target,
        return len;
 }
 
-static void srp_remove_req(struct srp_target_port *target, struct srp_request *req)
-{
-       srp_unmap_data(req->scmnd, target, req);
-       list_move_tail(&req->list, &target->free_reqs);
-}
-
 static void srp_process_rsp(struct srp_target_port *target, struct srp_rsp *rsp)
 {
        struct srp_request *req;
@@ -1348,11 +1347,8 @@ static int srp_reset_device(struct scsi_cmnd *scmnd)
        spin_lock_irq(target->scsi_host->host_lock);
 
        list_for_each_entry_safe(req, tmp, &target->req_queue, list)
-               if (req->scmnd->device == scmnd->device) {
-                       req->scmnd->result = DID_RESET << 16;
-                       req->scmnd->scsi_done(req->scmnd);
-                       srp_remove_req(target, req);
-               }
+               if (req->scmnd->device == scmnd->device)
+                       srp_reset_req(target, req);
 
        spin_unlock_irq(target->scsi_host->host_lock);