vfio: ccw: remove unnecessary NULL checks of a pointer

Remove several unnecessary checks for the @private pointer, since it
can never be NULL in these places.

Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Signed-off-by: Dong Jia Shi <bjsdjshi@linux.vnet.ibm.com>
Message-Id: <20170412090816.79108-2-bjsdjshi@linux.vnet.ibm.com>
Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>

2 files changed, 1 insertions, 22 deletions

diff --git a/drivers/s390/cio/vfio_ccw_fsm.c b/drivers/s390/cio/vfio_ccw_fsm.c
index 55b6cc55758e..80a0559cd7ce 100644
--- a/drivers/s390/cio/vfio_ccw_fsm.c
+++ b/drivers/s390/cio/vfio_ccw_fsm.c
@@ -161,12 +161,8 @@ err_out:
 static void fsm_irq(struct vfio_ccw_private *private,
                     enum vfio_ccw_event event)
 {
-        struct irb *irb;
+        struct irb *irb = this_cpu_ptr(&cio_irb);
 
-        if (!private)
-                return;
-
-        irb = this_cpu_ptr(&cio_irb);
         memcpy(&private->irb, irb, sizeof(*irb));
 
         queue_work(vfio_ccw_work_q, &private->io_work);
diff --git a/drivers/s390/cio/vfio_ccw_ops.c b/drivers/s390/cio/vfio_ccw_ops.c
index b2e615404034..55d0c87e73c3 100644
--- a/drivers/s390/cio/vfio_ccw_ops.c
+++ b/drivers/s390/cio/vfio_ccw_ops.c
@@ -19,9 +19,6 @@ static int vfio_ccw_mdev_reset(struct mdev_device *mdev)
         int ret;
 
         private = dev_get_drvdata(mdev_parent_dev(mdev));
-        if (!private)
-                return -ENODEV;
-
         sch = private->sch;
         /*
          * TODO:
@@ -49,9 +46,6 @@ static int vfio_ccw_mdev_notifier(struct notifier_block *nb,
         struct vfio_ccw_private *private =
                 container_of(nb, struct vfio_ccw_private, nb);
 
-        if (!private)
-                return NOTIFY_STOP;
-
         /*
          * Vendor drivers MUST unpin pages in response to an
          * invalidation.
@@ -134,9 +128,6 @@ static int vfio_ccw_mdev_remove(struct mdev_device *mdev)
                 dev_get_drvdata(mdev_parent_dev(mdev));
         int ret;
 
-        if (!private)
-                goto out;
-
         if ((private->state == VFIO_CCW_STATE_NOT_OPER) ||
             (private->state == VFIO_CCW_STATE_STANDBY))
                 goto out;
@@ -187,9 +178,6 @@ static ssize_t vfio_ccw_mdev_read(struct mdev_device *mdev,
                 return -EINVAL;
 
         private = dev_get_drvdata(mdev_parent_dev(mdev));
-        if (!private)
-                return -ENODEV;
-
         region = &private->io_region;
         if (copy_to_user(buf, (void *)region + *ppos, count))
                 return -EFAULT;
@@ -209,8 +197,6 @@ static ssize_t vfio_ccw_mdev_write(struct mdev_device *mdev,
                 return -EINVAL;
 
         private = dev_get_drvdata(mdev_parent_dev(mdev));
-        if (!private)
-                return -ENODEV;
         if (private->state != VFIO_CCW_STATE_IDLE)
                 return -EACCES;
 
@@ -274,9 +260,6 @@ static int vfio_ccw_mdev_set_irqs(struct mdev_device *mdev,
                 return -EINVAL;
 
         private = dev_get_drvdata(mdev_parent_dev(mdev));
-        if (!private)
-                return -ENODEV;
-
         ctx = &private->io_trigger;
 
         switch (flags & VFIO_IRQ_SET_DATA_TYPE_MASK) {