s390/scm_block: do not hide eadm subchannel dependency

Stop hiding scm_block's dependency to the eadm subchannel driver
(by using functions provided by the eadm subchannel instead of
wrappers provided by the scm bus).

This will help userspace recognizing module dependencies (e.g. for
building a ramdisk). As a side effect we can get rid of some code
reimplementing refcounting between those modules.

Reported-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Reviewed-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

2 files changed, 2 insertions, 53 deletions

diff --git a/drivers/s390/cio/eadm_sch.c b/drivers/s390/cio/eadm_sch.c
index aca7bfc113aa..3a2ee4a740b4 100644
--- a/drivers/s390/cio/eadm_sch.c
+++ b/drivers/s390/cio/eadm_sch.c
@@ -190,7 +190,7 @@ static struct subchannel *eadm_get_idle_sch(void)
         return NULL;
 }
 
-static int eadm_start_aob(struct aob *aob)
+int eadm_start_aob(struct aob *aob)
 {
         struct eadm_private *private;
         struct subchannel *sch;
@@ -218,6 +218,7 @@ out_unlock:
 
         return ret;
 }
+EXPORT_SYMBOL_GPL(eadm_start_aob);
 
 static int eadm_subchannel_probe(struct subchannel *sch)
 {
@@ -380,11 +381,6 @@ static struct css_driver eadm_subchannel_driver = {
         .restore = eadm_subchannel_restore,
 };
 
-static struct eadm_ops eadm_ops = {
-        .eadm_start = eadm_start_aob,
-        .owner = THIS_MODULE,
-};
-
 static int __init eadm_sch_init(void)
 {
         int ret;
@@ -404,7 +400,6 @@ static int __init eadm_sch_init(void)
         if (ret)
                 goto cleanup;
 
-        register_eadm_ops(&eadm_ops);
         return ret;
 
 cleanup:
@@ -415,7 +410,6 @@ cleanup:
 
 static void __exit eadm_sch_exit(void)
 {
-        unregister_eadm_ops(&eadm_ops);
         css_driver_unregister(&eadm_subchannel_driver);
         isc_unregister(EADM_SCH_ISC);
         debug_unregister(eadm_debug);
diff --git a/drivers/s390/cio/scm.c b/drivers/s390/cio/scm.c
index 46ec25632e8b..15268edc54ae 100644
--- a/drivers/s390/cio/scm.c
+++ b/drivers/s390/cio/scm.c
@@ -15,8 +15,6 @@
 #include "chsc.h"
 
 static struct device *scm_root;
-static struct eadm_ops *eadm_ops;
-static DEFINE_MUTEX(eadm_ops_mutex);
 
 #define to_scm_dev(n) container_of(n, struct scm_device, dev)
 #define to_scm_drv(d) container_of(d, struct scm_driver, drv)
@@ -73,49 +71,6 @@ void scm_driver_unregister(struct scm_driver *scmdrv)
 }
 EXPORT_SYMBOL_GPL(scm_driver_unregister);
 
-int scm_get_ref(void)
-{
-        int ret = 0;
-
-        mutex_lock(&eadm_ops_mutex);
-        if (!eadm_ops || !try_module_get(eadm_ops->owner))
-                ret = -ENOENT;
-        mutex_unlock(&eadm_ops_mutex);
-
-        return ret;
-}
-EXPORT_SYMBOL_GPL(scm_get_ref);
-
-void scm_put_ref(void)
-{
-        mutex_lock(&eadm_ops_mutex);
-        module_put(eadm_ops->owner);
-        mutex_unlock(&eadm_ops_mutex);
-}
-EXPORT_SYMBOL_GPL(scm_put_ref);
-
-void register_eadm_ops(struct eadm_ops *ops)
-{
-        mutex_lock(&eadm_ops_mutex);
-        eadm_ops = ops;
-        mutex_unlock(&eadm_ops_mutex);
-}
-EXPORT_SYMBOL_GPL(register_eadm_ops);
-
-void unregister_eadm_ops(struct eadm_ops *ops)
-{
-        mutex_lock(&eadm_ops_mutex);
-        eadm_ops = NULL;
-        mutex_unlock(&eadm_ops_mutex);
-}
-EXPORT_SYMBOL_GPL(unregister_eadm_ops);
-
-int scm_start_aob(struct aob *aob)
-{
-        return eadm_ops->eadm_start(aob);
-}
-EXPORT_SYMBOL_GPL(scm_start_aob);
-
 void scm_irq_handler(struct aob *aob, int error)
 {
         struct aob_rq_header *aobrq = (void *) aob->request.data;