char: make some qemu_chr_fe skip if no driver

In most cases, front ends do not care about the side effect of
CharBackend, so we can simply skip the checks and call the qemu_chr_fe
functions even without associated CharDriver.

Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
Message-Id: <20161022095318.17775-20-marcandre.lureau@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

1 files changed, 5 insertions, 9 deletions

diff --git a/hw/char/digic-uart.c b/hw/char/digic-uart.c
index c7b3db631d..2955e19f67 100644
--- a/hw/char/digic-uart.c
+++ b/hw/char/digic-uart.c
@@ -76,11 +76,9 @@ static void digic_uart_write(void *opaque, hwaddr addr, uint64_t value,
 
     switch (addr) {
     case R_TX:
-        if (s->chr.chr) {
-            /* XXX this blocks entire thread. Rewrite to use
-             * qemu_chr_fe_write and background I/O callbacks */
-            qemu_chr_fe_write_all(&s->chr, &ch, 1);
-        }
+        /* XXX this blocks entire thread. Rewrite to use
+         * qemu_chr_fe_write and background I/O callbacks */
+        qemu_chr_fe_write_all(&s->chr, &ch, 1);
         break;
 
     case R_ST:
@@ -147,10 +145,8 @@ static void digic_uart_realize(DeviceState *dev, Error **errp)
 {
     DigicUartState *s = DIGIC_UART(dev);
 
-    if (s->chr.chr) {
-        qemu_chr_fe_set_handlers(&s->chr, uart_can_rx, uart_rx,
-                                 uart_event, s, NULL);
-    }
+    qemu_chr_fe_set_handlers(&s->chr, uart_can_rx, uart_rx,
+                             uart_event, s, NULL);
 }
 
 static void digic_uart_init(Object *obj)