linux-kernel - [PATCH 05/10] vfio: ccw: Suppress unused event parameter

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Message-Id: <1524149293-12658-6-git-send-email-pmorel@linux.vnet.ibm.com>
Date:   Thu, 19 Apr 2018 16:48:08 +0200
From:   Pierre Morel <pmorel@...ux.vnet.ibm.com>
To:     pasic@...ux.vnet.ibm.com, bjsdjshi@...ux.vnet.ibm.com
Cc:     linux-s390@...r.kernel.org, linux-kernel@...r.kernel.org,
        kvm@...r.kernel.org, cohuck@...hat.com
Subject: [PATCH 05/10] vfio: ccw: Suppress unused event parameter

The fsm_func_t function type definition does not need the event
parameter since all functions are in a state/event table.

Signed-off-by: Pierre Morel <pmorel@...ux.vnet.ibm.com>
---
 drivers/s390/cio/vfio_ccw_fsm.c     | 34 +++++++++++-----------------------
 drivers/s390/cio/vfio_ccw_private.h |  5 ++---
 2 files changed, 13 insertions(+), 26 deletions(-)

diff --git a/drivers/s390/cio/vfio_ccw_fsm.c b/drivers/s390/cio/vfio_ccw_fsm.c
index f9855cd..f8ded70 100644
--- a/drivers/s390/cio/vfio_ccw_fsm.c
+++ b/drivers/s390/cio/vfio_ccw_fsm.c
@@ -55,8 +55,7 @@ static int fsm_io_helper(struct vfio_ccw_private *private)
 	}
 }
 
-static int fsm_notoper(struct vfio_ccw_private *private,
-			enum vfio_ccw_event event)
+static int fsm_notoper(struct vfio_ccw_private *private)
 {
 	struct subchannel *sch = private->sch;
 
@@ -65,36 +64,31 @@ static int fsm_notoper(struct vfio_ccw_private *private,
 	 * Probably we should send the machine check to the guest.
 	 */
 	css_sched_sch_todo(sch, SCH_TODO_UNREG);
-	private->state = VFIO_CCW_STATE_NOT_OPER;
-	return private->state;
+	return VFIO_CCW_STATE_NOT_OPER;
 }
 
 /*
  * No operation action.
  */
-static int fsm_nop(struct vfio_ccw_private *private,
-		    enum vfio_ccw_event event)
+static int fsm_nop(struct vfio_ccw_private *private)
 {
 	return private->state;
 }
 
-static int fsm_io_error(struct vfio_ccw_private *private,
-			 enum vfio_ccw_event event)
+static int fsm_io_error(struct vfio_ccw_private *private)
 {
 	pr_err("vfio-ccw: FSM: I/O request from state:%d\n", private->state);
 	private->io_region.ret_code = -EIO;
 	return private->state;
 }
 
-static int fsm_io_busy(struct vfio_ccw_private *private,
-			enum vfio_ccw_event event)
+static int fsm_io_busy(struct vfio_ccw_private *private)
 {
 	private->io_region.ret_code = -EBUSY;
 	return private->state;
 }
 
-static int fsm_disabled_irq(struct vfio_ccw_private *private,
-			     enum vfio_ccw_event event)
+static int fsm_disabled_irq(struct vfio_ccw_private *private)
 {
 	struct subchannel *sch = private->sch;
 
@@ -109,17 +103,14 @@ static int fsm_disabled_irq(struct vfio_ccw_private *private,
 /*
  * Deal with the ccw command request from the userspace.
  */
-static int fsm_io_request(struct vfio_ccw_private *private,
-			   enum vfio_ccw_event event)
+static int fsm_io_request(struct vfio_ccw_private *private)
 {
-	union orb *orb;
 	struct ccw_io_region *io_region = &private->io_region;
+	union orb *orb = (union orb *)io_region->orb_area;
 	struct mdev_device *mdev = private->mdev;
 
 	private->state = VFIO_CCW_STATE_BOXED;
 
-	orb = (union orb *)io_region->orb_area;
-
 	io_region->ret_code = cp_init(&private->cp, mdev_dev(mdev), orb);
 	if (io_region->ret_code)
 		goto err_out;
@@ -139,15 +130,13 @@ static int fsm_io_request(struct vfio_ccw_private *private,
 	return VFIO_CCW_STATE_BUSY;
 
 err_out:
-	private->state = VFIO_CCW_STATE_IDLE;
-	return private->state;
+	return VFIO_CCW_STATE_IDLE;
 }
 
 /*
  * Got an interrupt for a normal io (state busy).
  */
-static int fsm_irq(struct vfio_ccw_private *private,
-		    enum vfio_ccw_event event)
+static int fsm_irq(struct vfio_ccw_private *private)
 {
 	struct irb *irb = &private->irb;
 
@@ -166,8 +155,7 @@ static int fsm_irq(struct vfio_ccw_private *private,
 /*
  * Got a sub-channel event .
  */
-static int fsm_sch_event(struct vfio_ccw_private *private,
-			 enum vfio_ccw_event event)
+static int fsm_sch_event(struct vfio_ccw_private *private)
 {
 	unsigned long flags;
 	int ret = private->state;
diff --git a/drivers/s390/cio/vfio_ccw_private.h b/drivers/s390/cio/vfio_ccw_private.h
index 93aab87..823e46c 100644
--- a/drivers/s390/cio/vfio_ccw_private.h
+++ b/drivers/s390/cio/vfio_ccw_private.h
@@ -86,14 +86,13 @@ enum vfio_ccw_event {
 /*
  * Action called through jumptable.
  */
-typedef int (fsm_func_t)(struct vfio_ccw_private *, enum vfio_ccw_event);
+typedef int (fsm_func_t)(struct vfio_ccw_private *);
 extern fsm_func_t *vfio_ccw_jumptable[NR_VFIO_CCW_STATES][NR_VFIO_CCW_EVENTS];
 
 static inline void vfio_ccw_fsm_event(struct vfio_ccw_private *private,
 				     int event)
 {
-	private->state = vfio_ccw_jumptable[private->state][event](private,
-								   event);
+	private->state = vfio_ccw_jumptable[private->state][event](private);
 }
 
 extern struct workqueue_struct *vfio_ccw_work_q;
-- 
2.7.4