drivers:tty: fix return value check in asc_init_port

in asc_init_port, clk_prepare_enable may fail, therefore, the
return value of clk_prepare_enable should be checked.

Signed-off-by: Yuanjun Gong <ruc_gongyuanjun@163.com>
Link: https://lore.kernel.org/r/20230717144733.24194-1-ruc_gongyuanjun@163.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/st-asc.c b/drivers/tty/serial/st-asc.c
index b8954f0bba8fc9bec3a645d6a2b9bb10146f4892..92b9f6894006f78217d304fc76520b8ba6650c0b 100644 (file)
--- a/drivers/tty/serial/st-asc.c
+++ b/drivers/tty/serial/st-asc.c
@@ -703,7 +703,9 @@ static int asc_init_port(struct asc_port *ascport,
        if (WARN_ON(IS_ERR(ascport->clk)))
                return -EINVAL;
        /* ensure that clk rate is correct by enabling the clk */
-       clk_prepare_enable(ascport->clk);
+       ret = clk_prepare_enable(ascport->clk);
+       if (ret)
+               return ret;
        ascport->port.uartclk = clk_get_rate(ascport->clk);
        WARN_ON(ascport->port.uartclk == 0);
        clk_disable_unprepare(ascport->clk);