From: Yi Yang <yiyang13@xxxxxxxxxx>
[ Upstream commit 38f28cfe9d08e3a47ef008798b275fef8118fc20 ]
Add the missing clk_disable_unprepare() before return from
tegra_uart_hw_init() in the error handling path.
When request_irq() fails in tegra_uart_startup(), 'tup->uart_clk'
has been enabled, fix it by adding clk_disable_unprepare().
Fixes: cc9ca4d95846 ("serial: tegra: Only print FIFO error message when an error occurs")
Fixes: d781ec21bae6 ("serial: tegra: report clk rate errors")
Signed-off-by: Yi Yang <yiyang13@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20221126020852.113378-1-yiyang13@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/tty/serial/serial-tegra.c | 7 ++++++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c
index cda9cd4fa92c8..c08360212aa20 100644
--- a/drivers/tty/serial/serial-tegra.c
+++ b/drivers/tty/serial/serial-tegra.c
@@ -1047,6 +1047,7 @@ static int tegra_uart_hw_init(struct tegra_uart_port *tup)
if (tup->cdata->fifo_mode_enable_status) {
ret = tegra_uart_wait_fifo_mode_enabled(tup);
if (ret < 0) {
+ clk_disable_unprepare(tup->uart_clk);
dev_err(tup->uport.dev,
"Failed to enable FIFO mode: %d\n", ret);
return ret;
@@ -1068,6 +1069,7 @@ static int tegra_uart_hw_init(struct tegra_uart_port *tup)
*/
ret = tegra_set_baudrate(tup, TEGRA_UART_DEFAULT_BAUD);
if (ret < 0) {
+ clk_disable_unprepare(tup->uart_clk);
dev_err(tup->uport.dev, "Failed to set baud rate\n");
return ret;
}
@@ -1227,10 +1229,13 @@ static int tegra_uart_startup(struct uart_port *u)
dev_name(u->dev), tup);
if (ret < 0) {
dev_err(u->dev, "Failed to register ISR for IRQ %d\n", u->irq);
- goto fail_hw_init;
+ goto fail_request_irq;
}
return 0;
+fail_request_irq:
+ /* tup->uart_clk is already enabled in tegra_uart_hw_init */
+ clk_disable_unprepare(tup->uart_clk);
fail_hw_init:
if (!tup->use_rx_pio)
tegra_uart_dma_channel_free(tup, true);
--
2.39.2
