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path: root/drivers/s390/cio/device_ops.c
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Diffstat (limited to 'drivers/s390/cio/device_ops.c')
-rw-r--r--drivers/s390/cio/device_ops.c24
1 files changed, 8 insertions, 16 deletions
diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c
index 151754d5474..bf0a24af39a 100644
--- a/drivers/s390/cio/device_ops.c
+++ b/drivers/s390/cio/device_ops.c
@@ -114,7 +114,7 @@ int ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
struct subchannel *sch;
int ret;
- if (!cdev)
+ if (!cdev || !cdev->dev.parent)
return -ENODEV;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
@@ -122,8 +122,6 @@ int ccw_device_clear(struct ccw_device *cdev, unsigned long intparm)
cdev->private->state != DEV_STATE_W4SENSE)
return -EINVAL;
sch = to_subchannel(cdev->dev.parent);
- if (!sch)
- return -ENODEV;
ret = cio_clear(sch);
if (ret == 0)
cdev->private->intparm = intparm;
@@ -161,11 +159,9 @@ int ccw_device_start_key(struct ccw_device *cdev, struct ccw1 *cpa,
struct subchannel *sch;
int ret;
- if (!cdev)
+ if (!cdev || !cdev->dev.parent)
return -ENODEV;
sch = to_subchannel(cdev->dev.parent);
- if (!sch)
- return -ENODEV;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
if (cdev->private->state == DEV_STATE_VERIFY ||
@@ -339,7 +335,7 @@ int ccw_device_halt(struct ccw_device *cdev, unsigned long intparm)
struct subchannel *sch;
int ret;
- if (!cdev)
+ if (!cdev || !cdev->dev.parent)
return -ENODEV;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
@@ -347,8 +343,6 @@ int ccw_device_halt(struct ccw_device *cdev, unsigned long intparm)
cdev->private->state != DEV_STATE_W4SENSE)
return -EINVAL;
sch = to_subchannel(cdev->dev.parent);
- if (!sch)
- return -ENODEV;
ret = cio_halt(sch);
if (ret == 0)
cdev->private->intparm = intparm;
@@ -372,11 +366,9 @@ int ccw_device_resume(struct ccw_device *cdev)
{
struct subchannel *sch;
- if (!cdev)
+ if (!cdev || !cdev->dev.parent)
return -ENODEV;
sch = to_subchannel(cdev->dev.parent);
- if (!sch)
- return -ENODEV;
if (cdev->private->state == DEV_STATE_NOT_OPER)
return -ENODEV;
if (cdev->private->state != DEV_STATE_ONLINE ||
@@ -471,11 +463,11 @@ __u8 ccw_device_get_path_mask(struct ccw_device *cdev)
{
struct subchannel *sch;
- sch = to_subchannel(cdev->dev.parent);
- if (!sch)
+ if (!cdev->dev.parent)
return 0;
- else
- return sch->lpm;
+
+ sch = to_subchannel(cdev->dev.parent);
+ return sch->lpm;
}
/*