This is a note to let you know that I've just added the patch titled serial: tegra: Add missing clk_disable_unprepare() in tegra_uart_hw_init() to the 6.2-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: serial-tegra-add-missing-clk_disable_unprepare-in-te.patch and it can be found in the queue-6.2 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit b6a512461d039f812f10644a94789d6b06a1892e Author: Yi Yang <yiyang13@xxxxxxxxxx> Date: Sat Nov 26 10:08:52 2022 +0800 serial: tegra: Add missing clk_disable_unprepare() in tegra_uart_hw_init() [ 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> diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c index e5b9773db5e36..1cf08b33456c9 100644 --- a/drivers/tty/serial/serial-tegra.c +++ b/drivers/tty/serial/serial-tegra.c @@ -1046,6 +1046,7 @@ 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; @@ -1067,6 +1068,7 @@ 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; } @@ -1226,10 +1228,13 @@ 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);