uart drivers: use xzalloc instead of xmalloc

The flags in struct console_device have to be initialized
to zero. Otherwise the following can happen:

- console_register sets the initial baudrate of a new console
  before we set the global console init state to CONSOLE_INIT_FULL.
- In console_baudrate_set we test whether the current console is
  active which may be true because of unitialized flags.
- we then call getc() to wait for the user to accept the new settings
  and we are stuck because of the CONSOLE_UNINITIALIZED state
  we will never get anything from getc().

Looking back this explains some cases for me when barebox refused
to start and I really wonder why this did not become a more visible
problem before.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 1 insertions, 1 deletions

diff --git a/drivers/serial/amba-pl011.c b/drivers/serial/amba-pl011.c
index 148bdbf576..56f6f15825 100644
--- a/drivers/serial/amba-pl011.c
+++ b/drivers/serial/amba-pl011.c
@@ -159,7 +159,7 @@ static int pl011_probe(struct device_d *dev)
 	struct amba_uart_port *uart;
 	struct console_device *cdev;
 
-	uart = xmalloc(sizeof(struct amba_uart_port));
+	uart = xzalloc(sizeof(struct amba_uart_port));
 	uart->clk = clk_get(dev, NULL);
 
 	if (IS_ERR(uart->clk))