IB/srp: Avoid sending a task management function needlessly

Do not send a task management function if sending will fail anyway
because either there is no RDMA/RC connection or the QP is in the
error state.

Signed-off-by: Bart Van Assche <bvanassche@acm.org>
Acked-by: David Dillow <dave@thedillows.org>
Cc: <stable@vger.kernel.org> # 3.8
Signed-off-by: Roland Dreier <roland@purestorage.com>

diff --git a/drivers/infiniband/ulp/srp/ib_srp.c b/drivers/infiniband/ulp/srp/ib_srp.c
index 94f76b9..2633258 100644 (file)
--- a/drivers/infiniband/ulp/srp/ib_srp.c
+++ b/drivers/infiniband/ulp/srp/ib_srp.c
@@ -1695,6 +1695,9 @@ static int srp_send_tsk_mgmt(struct srp_target_port *target,
        struct srp_iu *iu;
        struct srp_tsk_mgmt *tsk_mgmt;
 
+       if (!target->connected || target->qp_in_error)
+               return -1;
+
        init_completion(&target->tsk_mgmt_done);
 
        spin_lock_irq(&target->lock);
@@ -1754,8 +1757,6 @@ static int srp_reset_device(struct scsi_cmnd *scmnd)
 
        shost_printk(KERN_ERR, target->scsi_host, "SRP reset_device called\n");
 
-       if (target->qp_in_error)
-               return FAILED;
        if (srp_send_tsk_mgmt(target, SRP_TAG_NO_REQ, scmnd->device->lun,
                              SRP_TSK_LUN_RESET))
                return FAILED;