[S390] cio: fix sanity checks in device_ops.
Some sanity checks in device_ops.c test the output of container_of
macros to be !NULL. Test the input parameters instead.
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/drivers/s390/cio/device_ops.c b/drivers/s390/cio/device_ops.c
index 151754d..bf0a24a 100644
--- a/drivers/s390/cio/device_ops.c
+++ b/drivers/s390/cio/device_ops.c
@@ -114,7 +114,7 @@
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 @@
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 @@
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 @@
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 @@
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 @@
{
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 @@
{
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;
}
/*