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drivers:tty: fix return value check in asc_init_port

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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>
This commit is contained in:
Yuanjun Gong 2023-07-17 22:47:33 +08:00 committed by Greg Kroah-Hartman
parent 17be181b06
commit 130a9571ae
1 changed files with 3 additions and 1 deletions
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4
drivers/tty/serial/st-asc.c
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@ -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);