diff options
Diffstat (limited to 'drivers/tty/hvc/hvc_udbg.c')
| -rw-r--r-- | drivers/tty/hvc/hvc_udbg.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/tty/hvc/hvc_udbg.c b/drivers/tty/hvc/hvc_udbg.c index b0957e61a7b..72228276fe3 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; @@ -67,9 +67,12 @@ 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, NO_IRQ, &hvc_udbg_ops, 16); + hp = hvc_alloc(0, 0, &hvc_udbg_ops, 16); if (IS_ERR(hp)) return PTR_ERR(hp); @@ -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); |