[PATCH] s390: ccw_device_probe_console return value

The return code of ccw_device_probe_console() is not properly handled.  It
should only return a valid ccw device pointer or a error value converted by
ERR_PTR.  Fix the console driver code to check with IS_ERR instead against
NULL.

Signed-off-by: Peter Oberparleiter <peter.oberparleiter@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

3 files changed, 5 insertions, 3 deletions

diff --git a/drivers/s390/char/con3215.c b/drivers/s390/char/con3215.c
index 1f060914cfa4..606f6ad285a0 100644
--- a/drivers/s390/char/con3215.c
+++ b/drivers/s390/char/con3215.c
@@ -21,6 +21,7 @@
 #include <linux/init.h>
 #include <linux/console.h>
 #include <linux/interrupt.h>
+#include <linux/err.h>
 
 #include <linux/slab.h>
 #include <linux/bootmem.h>
@@ -864,7 +865,7 @@ con3215_init(void)
         }
 
         cdev = ccw_device_probe_console();
-        if (!cdev)
+        if (IS_ERR(cdev))
                 return -ENODEV;
 
         raw3215[0] = raw = (struct raw3215_info *)
diff --git a/drivers/s390/char/con3270.c b/drivers/s390/char/con3270.c
index c570a9f6ce9c..ef607a1de55a 100644
--- a/drivers/s390/char/con3270.c
+++ b/drivers/s390/char/con3270.c
@@ -15,6 +15,7 @@
 #include <linux/interrupt.h>
 #include <linux/list.h>
 #include <linux/types.h>
+#include <linux/err.h>
 
 #include <asm/ccwdev.h>
 #include <asm/cio.h>
@@ -597,7 +598,7 @@ con3270_init(void)
         }
 
         cdev = ccw_device_probe_console();
-        if (!cdev)
+        if (IS_ERR(cdev))
                 return -ENODEV;
         rp = raw3270_setup_console(cdev);
         if (IS_ERR(rp))
diff --git a/drivers/s390/cio/device.c b/drivers/s390/cio/device.c
index ceebf08e095b..0b30921ce60d 100644
--- a/drivers/s390/cio/device.c
+++ b/drivers/s390/cio/device.c
@@ -1012,7 +1012,7 @@ ccw_device_probe_console(void)
         int ret;
 
         if (xchg(&console_cdev_in_use, 1) != 0)
-                return NULL;
+                return ERR_PTR(-EBUSY);
         sch = cio_probe_console();
         if (IS_ERR(sch)) {
                 console_cdev_in_use = 0;