isci: add some type safety to the state machine interface

Now that any given object type only has one state_machine we can use
container_of() to get back to the given state machine owner.

Reported-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 2 insertions, 11 deletions

diff --git a/drivers/scsi/isci/state_machine.c b/drivers/scsi/isci/state_machine.c
index 6057782af8c2..1bcd925e502f 100644
--- a/drivers/scsi/isci/state_machine.c
+++ b/drivers/scsi/isci/state_machine.c
@@ -68,7 +68,7 @@ static void sci_state_machine_exit_state(struct sci_base_state_machine *sm)
 	sci_state_transition_t exit = sm->state_table[state].exit_state;
 
 	if (exit)
-		exit(sm->state_machine_owner);
+		exit(sm);
 }
 
 static void sci_state_machine_enter_state(struct sci_base_state_machine *sm)
@@ -77,22 +77,15 @@ static void sci_state_machine_enter_state(struct sci_base_state_machine *sm)
 	sci_state_transition_t enter = sm->state_table[state].enter_state;
 
 	if (enter)
-		enter(sm->state_machine_owner);
+		enter(sm);
 }
 
-/*
- * ******************************************************************************
- * * P R O T E C T E D    M E T H O D S
- * ****************************************************************************** */
-
 /**
  * This method will set the initial state and state table for the state
  *    machine. The caller should follow this request with the initialize
  *    request to cause the state machine to start.
  * @sm: This parameter provides the state machine object to be
  *    constructed.
- * @state_machine_owner: This parameter indicates the object that is owns the
- *    state machine being constructed.
  * @state_table: This parameter specifies the table of state objects that is
  *    managed by this state machine.
  * @initial_state: This parameter specifies the value of the initial state for
@@ -100,11 +93,9 @@ static void sci_state_machine_enter_state(struct sci_base_state_machine *sm)
  *
  */
 void sci_base_state_machine_construct(struct sci_base_state_machine *sm,
-				      void *owner,
 				      const struct sci_base_state *state_table,
 				      u32 initial_state)
 {
-	sm->state_machine_owner = owner;
 	sm->initial_state_id    = initial_state;
 	sm->previous_state_id   = initial_state;
 	sm->current_state_id    = initial_state;