serial: omap: Make context_loss_cnt signed

get_context_loss_count returns an int however it is stored in
unsigned integer context_loss_cnt . This patch tries to make
context_loss_cnt int. So that in case of errors the value
(which may be negative) is not interpreted wrongly.

In serial_omap_runtime_resume in case of errors returned by
get_context_loss_count print a warning and do a restore.

Signed-off-by: Shubhrajyoti D <shubhrajyoti@ti.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/omap-serial.c b/drivers/tty/serial/omap-serial.c
index 6ede6fd..fd0fb8c 100644 (file)
--- a/drivers/tty/serial/omap-serial.c
+++ b/drivers/tty/serial/omap-serial.c
@@ -96,7 +96,7 @@ struct uart_omap_port {
        unsigned char           msr_saved_flags;
        char                    name[20];
        unsigned long           port_activity;
-       u32                     context_loss_cnt;
+       int                     context_loss_cnt;
        u32                     errata;
        u8                      wakeups_enabled;
        unsigned int            irq_pending:1;
@@ -1556,11 +1556,15 @@ static int serial_omap_runtime_resume(struct device *dev)
 {
        struct uart_omap_port *up = dev_get_drvdata(dev);
 
-       u32 loss_cnt = serial_omap_get_context_loss_count(up);
+       int loss_cnt = serial_omap_get_context_loss_count(up);
 
-       if (up->context_loss_cnt != loss_cnt)
+       if (loss_cnt < 0) {
+               dev_err(dev, "serial_omap_get_context_loss_count failed : %d\n",
+                       loss_cnt);
                serial_omap_restore_context(up);
-
+       } else if (up->context_loss_cnt != loss_cnt) {
+               serial_omap_restore_context(up);
+       }
        up->latency = up->calc_latency;
        schedule_work(&up->qos_work);