Revert "serial: clps711x: Give a chance to perform useful tasks during wait loop"

This reverts commit 63e3ad3252695a2b8c01b6f6c225e4537af08b85,
since this not works as expected and produce runtime error:

BUG: sleeping function called from invalid context at drivers/tty/serial/clps711x.c:379
in_atomic(): 0, irqs_disabled(): 128, pid: 287, name: mount

Signed-off-by: Alexander Shiyan <shc_work@mail.ru>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 6 insertions, 14 deletions

diff --git a/drivers/tty/serial/clps711x.c b/drivers/tty/serial/clps711x.c
index 5e6fdb1ea73b..14aaea0d4131 100644
--- a/drivers/tty/serial/clps711x.c
+++ b/drivers/tty/serial/clps711x.c
@@ -368,16 +368,12 @@ static const struct uart_ops uart_clps711x_ops = {
 static void uart_clps711x_console_putchar(struct uart_port *port, int ch)
 {
         struct clps711x_port *s = dev_get_drvdata(port->dev);
+        u32 sysflg = 0;
 
         /* Wait for FIFO is not full */
-        while (1) {
-                u32 sysflg = 0;
-
+        do {
                 regmap_read(s->syscon, SYSFLG_OFFSET, &sysflg);
-                if (!(sysflg & SYSFLG_UTXFF))
-                        break;
-                cond_resched();
-        }
+        } while (sysflg & SYSFLG_UTXFF);
 
         writew(ch, port->membase + UARTDR_OFFSET);
 }
@@ -387,18 +383,14 @@ static void uart_clps711x_console_write(struct console *co, const char *c,
 {
         struct uart_port *port = clps711x_uart.state[co->index].uart_port;
         struct clps711x_port *s = dev_get_drvdata(port->dev);
+        u32 sysflg = 0;
 
         uart_console_write(port, c, n, uart_clps711x_console_putchar);
 
         /* Wait for transmitter to become empty */
-        while (1) {
-                u32 sysflg = 0;
-
+        do {
                 regmap_read(s->syscon, SYSFLG_OFFSET, &sysflg);
-                if (!(sysflg & SYSFLG_UBUSY))
-                        break;
-                cond_resched();
-        }
+        } while (sysflg & SYSFLG_UBUSY);
 }
 
 static int uart_clps711x_console_setup(struct console *co, char *options)