1 files changed, 11 insertions, 10 deletions

diff --git a/drivers/s390/block/dasd_ioctl.c b/drivers/s390/block/dasd_ioctl.c
index 478bcdb90b6f..7039d9cf0fb4 100644
--- a/drivers/s390/block/dasd_ioctl.c
+++ b/drivers/s390/block/dasd_ioctl.c
@@ -17,7 +17,7 @@
 #include <linux/fs.h>
 #include <linux/blkpg.h>
 #include <linux/smp_lock.h>
-
+#include <asm/compat.h>
 #include <asm/ccwdev.h>
 #include <asm/cmb.h>
 #include <asm/uaccess.h>
@@ -260,7 +260,7 @@ static int dasd_ioctl_information(struct dasd_block *block,
         struct ccw_dev_id dev_id;
 
         base = block->base;
-        if (!base->discipline->fill_info)
+        if (!base->discipline || !base->discipline->fill_info)
                 return -EINVAL;
 
         dasd_info = kzalloc(sizeof(struct dasd_information2_t), GFP_KERNEL);
@@ -303,10 +303,7 @@ static int dasd_ioctl_information(struct dasd_block *block,
         dasd_info->features |=
                 ((base->features & DASD_FEATURE_READONLY) != 0);
 
-        if (base->discipline)
-                memcpy(dasd_info->type, base->discipline->name, 4);
-        else
-                memcpy(dasd_info->type, "none", 4);
+        memcpy(dasd_info->type, base->discipline->name, 4);
 
         if (block->request_queue->request_fn) {
                 struct list_head *l;
@@ -358,9 +355,8 @@ dasd_ioctl_set_ro(struct block_device *bdev, void __user *argp)
 }
 
 static int dasd_ioctl_readall_cmb(struct dasd_block *block, unsigned int cmd,
-                unsigned long arg)
+                                  struct cmbdata __user *argp)
 {
-        struct cmbdata __user *argp = (void __user *) arg;
         size_t size = _IOC_SIZE(cmd);
         struct cmbdata data;
         int ret;
@@ -376,7 +372,12 @@ dasd_do_ioctl(struct block_device *bdev, fmode_t mode,
               unsigned int cmd, unsigned long arg)
 {
         struct dasd_block *block = bdev->bd_disk->private_data;
-        void __user *argp = (void __user *)arg;
+        void __user *argp;
+
+        if (is_compat_task())
+                argp = compat_ptr(arg);
+        else
+                argp = (void __user *)arg;
 
         if (!block)
                 return -ENODEV;
@@ -414,7 +415,7 @@ dasd_do_ioctl(struct block_device *bdev, fmode_t mode,
         case BIODASDCMFDISABLE:
                 return disable_cmf(block->base->cdev);
         case BIODASDREADALLCMB:
-                return dasd_ioctl_readall_cmb(block, cmd, arg);
+                return dasd_ioctl_readall_cmb(block, cmd, argp);
         default:
                 /* if the discipline has an ioctl method try it. */
                 if (block->base->discipline->ioctl) {