serial: tegra: handle clk prepare error in tegra_uart_hw_init()

[ Upstream commit 5abd01145d0cc6cd1b7c2fe6ee0b9ea0fa13671e ]

In tegra_uart_hw_init(), the return value of clk_prepare_enable() should
be checked since it might fail.

Fixes: e9ea096dd225 ("serial: tegra: add serial driver")
Signed-off-by: Yi Yang <yiyang13@huawei.com>
Link: https://lore.kernel.org/r/20230817105406.228674-1-yiyang13@huawei.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c
index 25f34f86a0852d219fe299c8caf5e90b5296daaf..52d5c72227e7948ac2ca8854db2d1868ebb7ba4f 100644 (file)
--- a/drivers/tty/serial/serial-tegra.c
+++ b/drivers/tty/serial/serial-tegra.c
@@ -999,7 +999,11 @@ static int tegra_uart_hw_init(struct tegra_uart_port *tup)
        tup->ier_shadow = 0;
        tup->current_baud = 0;
 
-       clk_prepare_enable(tup->uart_clk);
+       ret = clk_prepare_enable(tup->uart_clk);
+       if (ret) {
+               dev_err(tup->uport.dev, "could not enable clk\n");
+               return ret;
+       }
 
        /* Reset the UART controller to clear all previous status.*/
        reset_control_assert(tup->rst);