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target/iscsi: Remove unneeded locking from iscsi_target_tx_thread

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When processing immediate queue, we're switching on a local variable
so it's not necessary to lock around it. However, we are modifying
cmd->i_state in two spots, so lock around those parts only.

Signed-off-by: Andy Grover <agrover@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Andy Grover 2012-04-03 15:51:08 -07:00 committed by Nicholas Bellinger
parent c6037cc546
commit 4580cf3848
1 changed files with 2 additions and 10 deletions
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12
drivers/target/iscsi/iscsi_target.c
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@ -3516,15 +3516,11 @@ int iscsi_target_tx_thread(void *arg)
state = qr->state;
kmem_cache_free(lio_qr_cache, qr);
spin_lock_bh(&cmd->istate_lock);
switch (state) {
case ISTATE_SEND_R2T:
spin_unlock_bh(&cmd->istate_lock);
ret = iscsit_send_r2t(cmd, conn);
break;
case ISTATE_REMOVE:
spin_unlock_bh(&cmd->istate_lock);
if (cmd->data_direction == DMA_TO_DEVICE)
iscsit_stop_dataout_timer(cmd);
@ -3535,13 +3531,11 @@ int iscsi_target_tx_thread(void *arg)
iscsit_free_cmd(cmd);
continue;
case ISTATE_SEND_NOPIN_WANT_RESPONSE:
spin_unlock_bh(&cmd->istate_lock);
iscsit_mod_nopin_response_timer(conn);
ret = iscsit_send_unsolicited_nopin(cmd,
conn, 1);
break;
case ISTATE_SEND_NOPIN_NO_RESPONSE:
spin_unlock_bh(&cmd->istate_lock);
ret = iscsit_send_unsolicited_nopin(cmd,
conn, 0);
break;
@ -3550,7 +3544,6 @@ int iscsi_target_tx_thread(void *arg)
" 0x%08x, i_state: %d on CID: %hu\n",
cmd->iscsi_opcode, cmd->init_task_tag, state,
conn->cid);
spin_unlock_bh(&cmd->istate_lock);
goto transport_err;
}
if (ret < 0)
@ -3561,19 +3554,19 @@ int iscsi_target_tx_thread(void *arg)
goto transport_err;
}
spin_lock_bh(&cmd->istate_lock);
switch (state) {
case ISTATE_SEND_R2T:
spin_unlock_bh(&cmd->istate_lock);
spin_lock_bh(&cmd->dataout_timeout_lock);
iscsit_start_dataout_timer(cmd, conn);
spin_unlock_bh(&cmd->dataout_timeout_lock);
break;
case ISTATE_SEND_NOPIN_WANT_RESPONSE:
spin_lock_bh(&cmd->istate_lock);
cmd->i_state = ISTATE_SENT_NOPIN_WANT_RESPONSE;
spin_unlock_bh(&cmd->istate_lock);
break;
case ISTATE_SEND_NOPIN_NO_RESPONSE:
spin_lock_bh(&cmd->istate_lock);
cmd->i_state = ISTATE_SENT_STATUS;
spin_unlock_bh(&cmd->istate_lock);
break;
@ -3582,7 +3575,6 @@ int iscsi_target_tx_thread(void *arg)
" 0x%08x, i_state: %d on CID: %hu\n",
cmd->iscsi_opcode, cmd->init_task_tag,
state, conn->cid);
spin_unlock_bh(&cmd->istate_lock);
goto transport_err;
}
}