From: 黄涛 <huangtao@rock-chips.com>
Date: Wed, 26 Jan 2011 11:57:37 +0000 (+0800)
Subject: serial: rk29: fix infinite loop on rk29_serial_set_termios
X-Git-Tag: firefly_0821_release~10789^2~9
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=2cbc72d654d5fbcff97f6a27440729d2718e6894;p=firefly-linux-kernel-4.4.55.git

serial: rk29: fix infinite loop on rk29_serial_set_termios
---

diff --git a/drivers/serial/rk29_serial.c b/drivers/serial/rk29_serial.c
index 8d896509cc7a..b5f3282217a0 100755
--- a/drivers/serial/rk29_serial.c
+++ b/drivers/serial/rk29_serial.c
@@ -400,8 +400,11 @@ static void rk29_serial_set_termios(struct uart_port *port, struct ktermios *ter
 		printk("UART_GET_MCR fcr=0x%x\n",fcr);
 	}
     mode = mode | LCR_DLA_EN;
-    while(rk29_uart_read(port,UART_USR)&UART_USR_BUSY)
-    	cpu_relax(); 
+    {
+        int timeout = 10000000;
+        while ((rk29_uart_read(port,UART_USR)&UART_USR_BUSY) && timeout--)
+           cpu_relax();
+    }
     rk29_uart_write(port,mode,UART_LCR);
     baud = rk29_set_baud_rate(port, baud);
     uart_update_timeout(port, termios->c_cflag, baud);