[S390] cio: Get rid of css_characteristics_avail.

Checking for the validity of the css_*_characteristics is
superfluous since they stay 0 for non-successful scsc.

Signed-off-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>

5 files changed, 5 insertions, 17 deletions

diff --git a/drivers/s390/cio/chp.c b/drivers/s390/cio/chp.c
index 0b3c3109f228..62df43b2124c 100644
--- a/drivers/s390/cio/chp.c
+++ b/drivers/s390/cio/chp.c
@@ -415,8 +415,7 @@ int chp_new(struct chp_id chpid)
                 goto out_free;
         }
         /* Get channel-measurement characteristics. */
-        if (css_characteristics_avail && css_chsc_characteristics.scmc
-            && css_chsc_characteristics.secm) {
+        if (css_chsc_characteristics.scmc && css_chsc_characteristics.secm) {
                 ret = chsc_get_channel_measurement_chars(chp);
                 if (ret)
                         goto out_free;
diff --git a/drivers/s390/cio/chsc.h b/drivers/s390/cio/chsc.h
index d4498d4005d3..2a38b5090228 100644
--- a/drivers/s390/cio/chsc.h
+++ b/drivers/s390/cio/chsc.h
@@ -78,7 +78,6 @@ struct chsc_ssd_info {
 extern int chsc_get_ssd_info(struct subchannel_id schid,
                              struct chsc_ssd_info *ssd);
 extern int chsc_determine_css_characteristics(void);
-extern int css_characteristics_avail;
 extern int chsc_alloc_sei_area(void);
 extern void chsc_free_sei_area(void);
 
diff --git a/drivers/s390/cio/cmf.c b/drivers/s390/cio/cmf.c
index 6c77c2326bd4..77523131a05e 100644
--- a/drivers/s390/cio/cmf.c
+++ b/drivers/s390/cio/cmf.c
@@ -1344,8 +1344,7 @@ static int __init init_cmf(void)
          * to basic mode.
          */
         if (format == CMF_AUTODETECT) {
-                if (!css_characteristics_avail ||
-                    !css_general_characteristics.ext_mb) {
+                if (!css_general_characteristics.ext_mb) {
                         format = CMF_BASIC;
                 } else {
                         format = CMF_EXTENDED;
diff --git a/drivers/s390/cio/css.c b/drivers/s390/cio/css.c
index 062716cf0f0c..ebed2212778d 100644
--- a/drivers/s390/cio/css.c
+++ b/drivers/s390/cio/css.c
@@ -30,8 +30,6 @@ static int max_ssid = 0;
 
 struct channel_subsystem *channel_subsystems[__MAX_CSSID + 1];
 
-int css_characteristics_avail = 0;
-
 int
 for_each_subchannel(int(*fn)(struct subchannel_id, void *), void *data)
 {
@@ -611,7 +609,7 @@ __init_channel_subsystem(struct subchannel_id schid, void *data)
 static void __init
 css_generate_pgid(struct channel_subsystem *css, u32 tod_high)
 {
-        if (css_characteristics_avail && css_general_characteristics.mcss) {
+        if (css_general_characteristics.mcss) {
                 css->global_pgid.pgid_high.ext_cssid.version = 0x80;
                 css->global_pgid.pgid_high.ext_cssid.cssid = css->cssid;
         } else {
@@ -748,8 +746,6 @@ init_channel_subsystem (void)
         ret = chsc_determine_css_characteristics();
         if (ret == -ENOMEM)
                 goto out; /* No need to continue. */
-        if (ret == 0)
-                css_characteristics_avail = 1;
 
         ret = chsc_alloc_sei_area();
         if (ret)
@@ -793,8 +789,7 @@ init_channel_subsystem (void)
                 ret = device_register(&css->device);
                 if (ret)
                         goto out_free_all;
-                if (css_characteristics_avail &&
-                    css_chsc_characteristics.secm) {
+                if (css_chsc_characteristics.secm) {
                         ret = device_create_file(&css->device,
                                                  &dev_attr_cm_enable);
                         if (ret)
@@ -832,7 +827,7 @@ out_unregister:
                 i--;
                 css = channel_subsystems[i];
                 device_unregister(&css->pseudo_subchannel->dev);
-                if (css_characteristics_avail && css_chsc_characteristics.secm)
+                if (css_chsc_characteristics.secm)
                         device_remove_file(&css->device,
                                            &dev_attr_cm_enable);
                 device_unregister(&css->device);
@@ -956,4 +951,3 @@ subsys_initcall(init_channel_subsystem);
 
 MODULE_LICENSE("GPL");
 EXPORT_SYMBOL(css_bus_type);
-EXPORT_SYMBOL_GPL(css_characteristics_avail);
diff --git a/drivers/s390/cio/qdio.c b/drivers/s390/cio/qdio.c
index 72508d8f3c4a..f9be265e7e8f 100644
--- a/drivers/s390/cio/qdio.c
+++ b/drivers/s390/cio/qdio.c
@@ -2354,9 +2354,6 @@ tiqdio_check_chsc_availability(void)
 {
         char dbf_text[15];
 
-        if (!css_characteristics_avail)
-                return -EIO;
-
         /* Check for bit 41. */
         if (!css_general_characteristics.aif) {
                 QDIO_PRINT_WARN("Adapter interruption facility not " \