nvme-fc: convert assoc_active flag to bit op

Convert the assoc_active boolean flag to a bitop on the flags field.
The bit ops will provide atomicity.

To make this change, the flags field was converted to a long type,
which also affects the FCCTRL_TERMIO flag.  Both FCCTRL_TERMIO and
now ASSOC_ACTIVE flags are set/cleared by bit operations.

Signed-off-by: James Smart <jsmart2021@gmail.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/nvme/host/fc.c b/drivers/nvme/host/fc.c
index bf80b94..0ac2466 100644 (file)
--- a/drivers/nvme/host/fc.c
+++ b/drivers/nvme/host/fc.c
@@ -127,9 +127,9 @@ struct nvme_fc_rport {
        unsigned long                   dev_loss_end;
 } __aligned(sizeof(u64));      /* alignment for other things alloc'd with */
 
-enum nvme_fcctrl_flags {
-       FCCTRL_TERMIO           = (1 << 0),
-};
+/* fc_ctrl flags values - specified as bit positions */
+#define ASSOC_ACTIVE           0
+#define FCCTRL_TERMIO          1
 
 struct nvme_fc_ctrl {
        spinlock_t              lock;
@@ -140,7 +140,6 @@ struct nvme_fc_ctrl {
        u32                     cnum;
 
        bool                    ioq_live;
-       bool                    assoc_active;
        atomic_t                err_work_active;
        u64                     association_id;
 
@@ -153,7 +152,7 @@ struct nvme_fc_ctrl {
        struct work_struct      err_work;
 
        struct kref             ref;
-       u32                     flags;
+       unsigned long           flags;
        u32                     iocnt;
        wait_queue_head_t       ioabort_wait;
 
@@ -1521,7 +1520,7 @@ __nvme_fc_abort_op(struct nvme_fc_ctrl *ctrl, struct nvme_fc_fcp_op *op)
        opstate = atomic_xchg(&op->state, FCPOP_STATE_ABORTED);
        if (opstate != FCPOP_STATE_ACTIVE)
                atomic_set(&op->state, opstate);
-       else if (ctrl->flags & FCCTRL_TERMIO)
+       else if (test_bit(FCCTRL_TERMIO, &ctrl->flags))
                ctrl->iocnt++;
        spin_unlock_irqrestore(&ctrl->lock, flags);
 
@@ -1558,7 +1557,7 @@ __nvme_fc_fcpop_chk_teardowns(struct nvme_fc_ctrl *ctrl,
 
        if (opstate == FCPOP_STATE_ABORTED) {
                spin_lock_irqsave(&ctrl->lock, flags);
-               if (ctrl->flags & FCCTRL_TERMIO) {
+               if (test_bit(FCCTRL_TERMIO, &ctrl->flags)) {
                        if (!--ctrl->iocnt)
                                wake_up(&ctrl->ioabort_wait);
                }
@@ -2386,16 +2385,9 @@ nvme_fc_submit_async_event(struct nvme_ctrl *arg)
 {
        struct nvme_fc_ctrl *ctrl = to_fc_ctrl(arg);
        struct nvme_fc_fcp_op *aen_op;
-       unsigned long flags;
-       bool terminating = false;
        blk_status_t ret;
 
-       spin_lock_irqsave(&ctrl->lock, flags);
-       if (ctrl->flags & FCCTRL_TERMIO)
-               terminating = true;
-       spin_unlock_irqrestore(&ctrl->lock, flags);
-
-       if (terminating)
+       if (test_bit(FCCTRL_TERMIO, &ctrl->flags))
                return;
 
        aen_op = &ctrl->aen_ops[0];
@@ -2604,10 +2596,9 @@ nvme_fc_ctlr_active_on_rport(struct nvme_fc_ctrl *ctrl)
        struct nvme_fc_rport *rport = ctrl->rport;
        u32 cnt;
 
-       if (ctrl->assoc_active)
+       if (test_and_set_bit(ASSOC_ACTIVE, &ctrl->flags))
                return 1;
 
-       ctrl->assoc_active = true;
        cnt = atomic_inc_return(&rport->act_ctrl_cnt);
        if (cnt == 1)
                nvme_fc_rport_active_on_lport(rport);
@@ -2622,7 +2613,7 @@ nvme_fc_ctlr_inactive_on_rport(struct nvme_fc_ctrl *ctrl)
        struct nvme_fc_lport *lport = rport->lport;
        u32 cnt;
 
-       /* ctrl->assoc_active=false will be set independently */
+       /* clearing of ctrl->flags ASSOC_ACTIVE bit is in association delete */
 
        cnt = atomic_dec_return(&rport->act_ctrl_cnt);
        if (cnt == 0) {
@@ -2764,7 +2755,7 @@ out_delete_hw_queue:
        __nvme_fc_delete_hw_queue(ctrl, &ctrl->queues[0], 0);
 out_free_queue:
        nvme_fc_free_queue(&ctrl->queues[0]);
-       ctrl->assoc_active = false;
+       clear_bit(ASSOC_ACTIVE, &ctrl->flags);
        nvme_fc_ctlr_inactive_on_rport(ctrl);
 
        return ret;
@@ -2781,12 +2772,11 @@ nvme_fc_delete_association(struct nvme_fc_ctrl *ctrl)
 {
        unsigned long flags;
 
-       if (!ctrl->assoc_active)
+       if (!test_and_clear_bit(ASSOC_ACTIVE, &ctrl->flags))
                return;
-       ctrl->assoc_active = false;
 
        spin_lock_irqsave(&ctrl->lock, flags);
-       ctrl->flags |= FCCTRL_TERMIO;
+       set_bit(FCCTRL_TERMIO, &ctrl->flags);
        ctrl->iocnt = 0;
        spin_unlock_irqrestore(&ctrl->lock, flags);
 
@@ -2837,7 +2827,7 @@ nvme_fc_delete_association(struct nvme_fc_ctrl *ctrl)
        /* wait for all io that had to be aborted */
        spin_lock_irq(&ctrl->lock);
        wait_event_lock_irq(ctrl->ioabort_wait, ctrl->iocnt == 0, ctrl->lock);
-       ctrl->flags &= ~FCCTRL_TERMIO;
+       clear_bit(FCCTRL_TERMIO, &ctrl->flags);
        spin_unlock_irq(&ctrl->lock);
 
        nvme_fc_term_aen_ops(ctrl);
@@ -3109,7 +3099,6 @@ nvme_fc_init_ctrl(struct device *dev, struct nvmf_ctrl_options *opts,
        ctrl->dev = lport->dev;
        ctrl->cnum = idx;
        ctrl->ioq_live = false;
-       ctrl->assoc_active = false;
        atomic_set(&ctrl->err_work_active, 0);
        init_waitqueue_head(&ctrl->ioabort_wait);