[Qemu-devel] [PATCH 1/7] serial: add serial_chr_nonnull() to use the null backend when none provided

[Philippe Mathieu-Daudé]

Suggested-by: Peter Maydell <address@hidden>
Signed-off-by: Philippe Mathieu-Daudé <address@hidden>
---
 include/hw/char/serial.h |  1 +
 hw/char/serial.c         | 13 +++++++++++++
 2 files changed, 14 insertions(+)

diff --git a/include/hw/char/serial.h b/include/hw/char/serial.h
index c4daf11a14..96bccb39e1 100644
--- a/include/hw/char/serial.h
+++ b/include/hw/char/serial.h
@@ -93,6 +93,7 @@ SerialState *serial_mm_init(MemoryRegion *address_space,
                             hwaddr base, int it_shift,
                             qemu_irq irq, int baudbase,
                             Chardev *chr, enum device_endian end);
+Chardev *serial_chr_nonnull(Chardev *chr);
 
 /* serial-isa.c */
 #define TYPE_ISA_SERIAL "isa-serial"
diff --git a/hw/char/serial.c b/hw/char/serial.c
index 9aec6c60d8..7a100db107 100644
--- a/hw/char/serial.c
+++ b/hw/char/serial.c
@@ -1025,6 +1025,19 @@ static const MemoryRegionOps serial_mm_ops[3] = {
     },
 };
 
+Chardev *serial_chr_nonnull(Chardev *chr)
+{
+    static int serial_id;
+    char *label;
+
+    label = g_strdup_printf("discarding-serial%d", serial_id++);
+    chr = qemu_chr_new(label, "null");
+    assert(chr);
+    g_free(label);
+
+    return chr;
+}
+
 SerialState *serial_mm_init(MemoryRegion *address_space,
                             hwaddr base, int it_shift,
                             qemu_irq irq, int baudbase,
-- 
2.14.1