[S390] set preferred console based on conmode

setup_arch() unconditionally sets the preferred console to ttyS.
This breaks the use of 3270 devices as the console. Provide a new
function to set the default preferred console for s390. The preferred
console depends on the conmode parameter that is used to switch
between 3270 and 3215 terminal/console mode.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c
index 9717717..cbb897b 100644 (file)
--- a/arch/s390/kernel/setup.c
+++ b/arch/s390/kernel/setup.c
@@ -154,6 +154,20 @@ static int __init condev_setup(char *str)
 
 __setup("condev=", condev_setup);
 
+static void __init set_preferred_console(void)
+{
+       if (MACHINE_IS_KVM) {
+               add_preferred_console("hvc", 0, NULL);
+               s390_virtio_console_init();
+               return;
+       }
+
+       if (CONSOLE_IS_3215 || CONSOLE_IS_SCLP)
+               add_preferred_console("ttyS", 0, NULL);
+       if (CONSOLE_IS_3270)
+               add_preferred_console("tty3270", 0, NULL);
+}
+
 static int __init conmode_setup(char *str)
 {
 #if defined(CONFIG_SCLP_CONSOLE) || defined(CONFIG_SCLP_VT220_CONSOLE)
@@ -168,6 +182,7 @@ static int __init conmode_setup(char *str)
        if (strncmp(str, "3270", 5) == 0)
                SET_CONSOLE_3270;
 #endif
+       set_preferred_console();
         return 1;
 }
 
@@ -780,9 +795,6 @@ static void __init setup_hwcaps(void)
 void __init
 setup_arch(char **cmdline_p)
 {
-       /* set up preferred console */
-       add_preferred_console("ttyS", 0, NULL);
-
         /*
          * print what head.S has found out about the machine
          */
@@ -802,11 +814,9 @@ setup_arch(char **cmdline_p)
        if (MACHINE_IS_VM)
                pr_info("Linux is running as a z/VM "
                        "guest operating system in 64-bit mode\n");
-       else if (MACHINE_IS_KVM) {
+       else if (MACHINE_IS_KVM)
                pr_info("Linux is running under KVM in 64-bit mode\n");
-               add_preferred_console("hvc", 0, NULL);
-               s390_virtio_console_init();
-       } else
+       else
                pr_info("Linux is running natively in 64-bit mode\n");
 #endif /* CONFIG_64BIT */
 
@@ -851,6 +861,7 @@ setup_arch(char **cmdline_p)
 
         /* Setup default console */
        conmode_default();
+       set_preferred_console();
 
        /* Setup zfcpdump support */
        setup_zfcpdump(console_devno);