serial: imx: Do not store/restore the UBRC register

UBRC is a read-only register, so we should not store and restore it inside
imx_flush_buffer().

Reported-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Acked-by: Fugang Duan <B38611@freescale.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 1 insertions, 3 deletions

diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c
index 412bfbf8730b..ca00b3f1520f 100644
--- a/drivers/tty/serial/imx.c
+++ b/drivers/tty/serial/imx.c
@@ -1320,7 +1320,7 @@ static void imx_flush_buffer(struct uart_port *port)
         struct imx_port *sport = (struct imx_port *)port;
         struct scatterlist *sgl = &sport->tx_sgl[0];
         unsigned long temp;
-        int i = 100, ubir, ubmr, ubrc, uts;
+        int i = 100, ubir, ubmr, uts;
 
         if (!sport->dma_chan_tx)
                 return;
@@ -1345,7 +1345,6 @@ static void imx_flush_buffer(struct uart_port *port)
          */
         ubir = readl(sport->port.membase + UBIR);
         ubmr = readl(sport->port.membase + UBMR);
-        ubrc = readl(sport->port.membase + UBRC);
         uts = readl(sport->port.membase + IMX21_UTS);
 
         temp = readl(sport->port.membase + UCR2);
@@ -1358,7 +1357,6 @@ static void imx_flush_buffer(struct uart_port *port)
         /* Restore the registers */
         writel(ubir, sport->port.membase + UBIR);
         writel(ubmr, sport->port.membase + UBMR);
-        writel(ubrc, sport->port.membase + UBRC);
         writel(uts, sport->port.membase + IMX21_UTS);
 }