serial: sh-sci: Uninitialized variables in sysfs files

The kstrtol() function returns -ERANGE as well as -EINVAL so these tests
are not enough.  It's not a super serious bug, but my static checker
correctly complains that the "r" variable might be used uninitialized.

Fixes: 5d23188a473d ("serial: sh-sci: make RX FIFO parameters tunable via sysfs")
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Cc: stable <stable@vger.kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 8 insertions, 4 deletions

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index da5ddfc14778..e08b16b070c0 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1085,10 +1085,12 @@ static ssize_t rx_trigger_store(struct device *dev,
 {
         struct uart_port *port = dev_get_drvdata(dev);
         struct sci_port *sci = to_sci_port(port);
+        int ret;
         long r;
 
-        if (kstrtol(buf, 0, &r) == -EINVAL)
-                return -EINVAL;
+        ret = kstrtol(buf, 0, &r);
+        if (ret)
+                return ret;
 
         sci->rx_trigger = scif_set_rtrg(port, r);
         if (port->type == PORT_SCIFA || port->type == PORT_SCIFB)
@@ -1116,10 +1118,12 @@ static ssize_t rx_fifo_timeout_store(struct device *dev,
 {
         struct uart_port *port = dev_get_drvdata(dev);
         struct sci_port *sci = to_sci_port(port);
+        int ret;
         long r;
 
-        if (kstrtol(buf, 0, &r) == -EINVAL)
-                return -EINVAL;
+        ret = kstrtol(buf, 0, &r);
+        if (ret)
+                return ret;
         sci->rx_fifo_timeout = r;
         scif_set_rtrg(port, 1);
         if (r > 0)