[PATCH v2] tty: serial: msm_serial: avoid system lockup condition

[Jorge Ramirez-Ortiz]

The function msm_wait_for_xmitr can be taken with interrupts
disabled. In order to avoid a potential system lockup - demonstrated
under stress testing conditions on SoC QCS404/5 - make sure we wait
for a bounded amount of time.

Tested on SoC QCS404.

Signed-off-by: Jorge Ramirez-Ortiz <jorge.ramirez-or...@linaro.org>
---
 drivers/tty/serial/msm_serial.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/drivers/tty/serial/msm_serial.c b/drivers/tty/serial/msm_serial.c
index 23833ad952ba..3657a24913fc 100644
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -383,10 +383,14 @@ static void msm_request_rx_dma(struct msm_port *msm_port, 
resource_size_t base)
 
 static inline void msm_wait_for_xmitr(struct uart_port *port)
 {
+       unsigned int timeout = 500000;
+
        while (!(msm_read(port, UART_SR) & UART_SR_TX_EMPTY)) {
                if (msm_read(port, UART_ISR) & UART_ISR_TX_READY)
                        break;
                udelay(1);
+               if (!timeout--)
+                       break;
        }
        msm_write(port, UART_CR_CMD_RESET_TX_READY, UART_CR);
 }
-- 
2.21.0