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path: root/drivers/tty/hvc/hvc_udbg.c
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Diffstat (limited to 'drivers/tty/hvc/hvc_udbg.c')
-rw-r--r--drivers/tty/hvc/hvc_udbg.c8
1 files changed, 7 insertions, 1 deletions
diff --git a/drivers/tty/hvc/hvc_udbg.c b/drivers/tty/hvc/hvc_udbg.c
index 4c9b13e7748c..72228276fe31 100644
--- a/drivers/tty/hvc/hvc_udbg.c
+++ b/drivers/tty/hvc/hvc_udbg.c
@@ -36,7 +36,7 @@ static int hvc_udbg_put(uint32_t vtermno, const char *buf, int count)
{
int i;
- for (i = 0; i < count; i++)
+ for (i = 0; i < count && udbg_putc; i++)
udbg_putc(buf[i]);
return i;
@@ -67,6 +67,9 @@ static int __init hvc_udbg_init(void)
{
struct hvc_struct *hp;
+ if (!udbg_putc)
+ return -ENODEV;
+
BUG_ON(hvc_udbg_dev);
hp = hvc_alloc(0, 0, &hvc_udbg_ops, 16);
@@ -88,6 +91,9 @@ module_exit(hvc_udbg_exit);
static int __init hvc_udbg_console_init(void)
{
+ if (!udbg_putc)
+ return -ENODEV;
+
hvc_instantiate(0, 0, &hvc_udbg_ops);
add_preferred_console("hvc", 0, NULL);