[S390] dasd: fix bug in dasd initialization cleanup

The initialization of the dasd_eer code is one of the last steps of the
dasd driver initialization. When initialization fails in one of the
earlier steps, the dasd_exit function is called to clean up what has been
done so far. So the dasd_eer_exit function may be called, although the
dasd_eer_init function wasn't called before and dasd_eer_exit tries to
unregister a misc device that wasn't registered, which results in a BUG.

Make sure that dasd_eer_exit can be called without initialization. Use a
dynamically allocated struct miscdevice instead of a static one, so we
only try to unregister the device if it exists and was actually registered.

Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 17 insertions, 7 deletions

diff --git a/drivers/s390/block/dasd_eer.c b/drivers/s390/block/dasd_eer.c
index e0bf30ebb21..6cedc914077 100644
--- a/drivers/s390/block/dasd_eer.c
+++ b/drivers/s390/block/dasd_eer.c
@@ -658,18 +658,24 @@ static struct file_operations dasd_eer_fops = {
         .owner          = THIS_MODULE,
 };
 
-static struct miscdevice dasd_eer_dev = {
-        .minor      = MISC_DYNAMIC_MINOR,
-        .name       = "dasd_eer",
-        .fops       = &dasd_eer_fops,
-};
+static struct miscdevice *dasd_eer_dev = NULL;
 
 int __init dasd_eer_init(void)
 {
         int rc;
 
-        rc = misc_register(&dasd_eer_dev);
+        dasd_eer_dev = kzalloc(sizeof(*dasd_eer_dev), GFP_KERNEL);
+        if (!dasd_eer_dev)
+                return -ENOMEM;
+
+        dasd_eer_dev->minor = MISC_DYNAMIC_MINOR;
+        dasd_eer_dev->name  = "dasd_eer";
+        dasd_eer_dev->fops  = &dasd_eer_fops;
+
+        rc = misc_register(dasd_eer_dev);
         if (rc) {
+                kfree(dasd_eer_dev);
+                dasd_eer_dev = NULL;
                 MESSAGE(KERN_ERR, "%s", "dasd_eer_init could not "
                        "register misc device");
                 return rc;
@@ -680,5 +686,9 @@ int __init dasd_eer_init(void)
 
 void dasd_eer_exit(void)
 {
-        WARN_ON(misc_deregister(&dasd_eer_dev) != 0);
+        if (dasd_eer_dev) {
+                WARN_ON(misc_deregister(dasd_eer_dev) != 0);
+                kfree(dasd_eer_dev);
+                dasd_eer_dev = NULL;
+        }
 }