IB/srpt: Micro-optimize I/O context state manipulation

Since all I/O context state changes are already serialized, it is
not necessary to protect I/O context state changes with the I/O
context spinlock. Hence remove that spinlock.

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 d2835b0..d78f60d 100644 (file)
--- a/drivers/infiniband/ulp/srpt/ib_srpt.c
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.c
@@ -764,15 +764,10 @@ static enum srpt_command_state srpt_set_cmd_state(struct srpt_send_ioctx *ioctx,
                                                  enum srpt_command_state new)
 {
        enum srpt_command_state previous;
-       unsigned long flags;
-
-       BUG_ON(!ioctx);
 
-       spin_lock_irqsave(&ioctx->spinlock, flags);
        previous = ioctx->state;
        if (previous != SRPT_STATE_DONE)
                ioctx->state = new;
-       spin_unlock_irqrestore(&ioctx->spinlock, flags);
 
        return previous;
 }
@@ -790,17 +785,15 @@ static bool srpt_test_and_set_cmd_state(struct srpt_send_ioctx *ioctx,
                                        enum srpt_command_state new)
 {
        enum srpt_command_state previous;
-       unsigned long flags;
 
        WARN_ON(!ioctx);
        WARN_ON(old == SRPT_STATE_DONE);
        WARN_ON(new == SRPT_STATE_NEW);
 
-       spin_lock_irqsave(&ioctx->spinlock, flags);
        previous = ioctx->state;
        if (previous == old)
                ioctx->state = new;
-       spin_unlock_irqrestore(&ioctx->spinlock, flags);
+
        return previous == old;
 }
 
@@ -1170,7 +1163,6 @@ static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
                return ioctx;
 
        BUG_ON(ioctx->ch != ch);
-       spin_lock_init(&ioctx->spinlock);
        ioctx->state = SRPT_STATE_NEW;
        ioctx->n_rdma = 0;
        ioctx->n_rw_ctx = 0;
@@ -1192,7 +1184,6 @@ static struct srpt_send_ioctx *srpt_get_send_ioctx(struct srpt_rdma_ch *ch)
 static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
 {
        enum srpt_command_state state;
-       unsigned long flags;
 
        BUG_ON(!ioctx);
 
@@ -1201,7 +1192,6 @@ static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
         * the ib_srpt driver, change the state to the next state.
         */
 
-       spin_lock_irqsave(&ioctx->spinlock, flags);
        state = ioctx->state;
        switch (state) {
        case SRPT_STATE_NEED_DATA:
@@ -1216,7 +1206,6 @@ static int srpt_abort_cmd(struct srpt_send_ioctx *ioctx)
                          __func__, state);
                break;
        }
-       spin_unlock_irqrestore(&ioctx->spinlock, flags);
 
        pr_debug("Aborting cmd with state %d -> %d and tag %lld\n", state,
                 ioctx->state, ioctx->cmd.tag);
@@ -2431,13 +2420,11 @@ static void srpt_queue_response(struct se_cmd *cmd)
        struct ib_send_wr send_wr, *first_wr = &send_wr, *bad_wr;
        struct ib_sge sge;
        enum srpt_command_state state;
-       unsigned long flags;
        int resp_len, ret, i;
        u8 srp_tm_status;
 
        BUG_ON(!ch);
 
-       spin_lock_irqsave(&ioctx->spinlock, flags);
        state = ioctx->state;
        switch (state) {
        case SRPT_STATE_NEW:
@@ -2452,7 +2439,6 @@ static void srpt_queue_response(struct se_cmd *cmd)
                        ch, ioctx->ioctx.index, ioctx->state);
                break;
        }
-       spin_unlock_irqrestore(&ioctx->spinlock, flags);
 
        if (unlikely(WARN_ON_ONCE(state == SRPT_STATE_CMD_RSP_SENT)))
                return;

diff --git a/drivers/infiniband/ulp/srpt/ib_srpt.h b/drivers/infiniband/ulp/srpt/ib_srpt.h
index 8f90a7c..11ce8c9 100644 (file)
--- a/drivers/infiniband/ulp/srpt/ib_srpt.h
+++ b/drivers/infiniband/ulp/srpt/ib_srpt.h
@@ -195,7 +195,6 @@ struct srpt_rw_ctx {
  * @rw_ctxs:     RDMA read/write contexts.
  * @rdma_cqe:    RDMA completion queue element.
  * @free_list:   Node in srpt_rdma_ch.free_list.
- * @spinlock:    Protects 'state'.
  * @state:       I/O context state.
  * @cmd:         Target core command data structure.
  * @sense_data:  SCSI sense data.
@@ -213,7 +212,6 @@ struct srpt_send_ioctx {
 
        struct ib_cqe           rdma_cqe;
        struct list_head        free_list;
-       spinlock_t              spinlock;
        enum srpt_command_state state;
        struct se_cmd           cmd;
        u8                      n_rdma;