[PATCH 4.19 157/273] serial: tegra: handle clk prepare error in tegra_uart_hw_init()

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4.19-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Yi Yang <yiyang13@xxxxxxxxxx>

[ 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@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230817105406.228674-1-yiyang13@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/tty/serial/serial-tegra.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c
index 41fe45f2349ef..a30f7ed123469 100644
--- a/drivers/tty/serial/serial-tegra.c
+++ b/drivers/tty/serial/serial-tegra.c
@@ -944,7 +944,11 @@ 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);
-- 
2.40.1






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