staging: lustre: uapi: remove obd_ioctl_popdata() wrapper

Replace obd_ioctl_popdata() with direct copy_to_user() call.
Signed-off-by: James Simmons <uja.ornl@yahoo.com>
Intel-bug-id: https://jira.hpdd.intel.com/browse/LU-6401
Reviewed-on: https://review.whamcloud.com/24568Reviewed-by: Andreas Dilger <andreas.dilger@intel.com>
Reviewed-by: Ben Evans <bevans@cray.com>
Reviewed-by: Oleg Drokin <oleg.drokin@intel.com>
Signed-off-by: James Simmons <jsimmons@infradead.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/lustre/lustre/include/lustre/lustre_ioctl.h

@@ -209,7 +209,6 @@ static inline int obd_ioctl_is_invalid(struct obd_ioctl_data *data)
 }
 
 int obd_ioctl_getdata(char **buf, int *len, void __user *arg);
-int obd_ioctl_popdata(void __user *arg, void *data, int len);
 
 /*
  * OBD_IOC_DATA_TYPE is only for compatibility reasons with older

drivers/staging/lustre/lustre/obdclass/class_obd.c

@@ -206,8 +206,7 @@ int class_handle_ioctl(unsigned int cmd, unsigned long arg)
 		memcpy(data->ioc_bulk, LUSTRE_VERSION_STRING,
 		       strlen(LUSTRE_VERSION_STRING) + 1);
 
-		err = obd_ioctl_popdata((void __user *)arg, data, len);
-		if (err)
+		if (copy_to_user((void __user *)arg, data, len))
 			err = -EFAULT;
 		goto out;
 
@@ -225,9 +224,7 @@ int class_handle_ioctl(unsigned int cmd, unsigned long arg)
 			goto out;
 		}
 
-		err = obd_ioctl_popdata((void __user *)arg, data,
-					sizeof(*data));
-		if (err)
+		if (copy_to_user((void __user *)arg, data, sizeof(*data)))
 			err = -EFAULT;
 		goto out;
 	}
@@ -263,8 +260,8 @@ int class_handle_ioctl(unsigned int cmd, unsigned long arg)
 
 		CDEBUG(D_IOCTL, "device name %s, dev %d\n", data->ioc_inlbuf1,
 		       dev);
-		err = obd_ioctl_popdata((void __user *)arg, data,
-					sizeof(*data));
+
+		if (copy_to_user((void __user *)arg, data, sizeof(*data)))
 		if (err)
 			err = -EFAULT;
 		goto out;
@@ -304,9 +301,9 @@ int class_handle_ioctl(unsigned int cmd, unsigned long arg)
 			 (int)index, status, obd->obd_type->typ_name,
 			 obd->obd_name, obd->obd_uuid.uuid,
 			 atomic_read(&obd->obd_refcount));
-		err = obd_ioctl_popdata((void __user *)arg, data, len);
 
-		err = 0;
+		if (copy_to_user((void __user *)arg, data, len))
+			err = -EFAULT;
 		goto out;
 	}
 	}
@@ -361,8 +358,7 @@ int class_handle_ioctl(unsigned int cmd, unsigned long arg)
 		if (err)
 			goto out;
 
-		err = obd_ioctl_popdata((void __user *)arg, data, len);
-		if (err)
+		if (copy_to_user((void __user *)arg, data, len))
 			err = -EFAULT;
 		goto out;
 	}

drivers/staging/lustre/lustre/obdclass/linux/linux-module.c

@@ -151,14 +151,6 @@ int obd_ioctl_getdata(char **buf, int *len, void __user *arg)
 }
 EXPORT_SYMBOL(obd_ioctl_getdata);
 
-int obd_ioctl_popdata(void __user *arg, void *data, int len)
-{
-	int err;
-
-	err = copy_to_user(arg, data, len) ? -EFAULT : 0;
-	return err;
-}
-
 /*  opening /dev/obd */
 static int obd_class_open(struct inode *inode, struct file *file)
 {