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Message-ID: <20221126020852.113378-1-yiyang13@huawei.com> Date: Sat, 26 Nov 2022 10:08:52 +0800 From: Yi Yang <yiyang13@...wei.com> To: <ldewangan@...dia.com>, <gregkh@...uxfoundation.org>, <jirislaby@...nel.org>, <thierry.reding@...il.com>, <jonathanh@...dia.com>, <kyarlagadda@...dia.com>, <yiyang13@...wei.com> CC: <linux-serial@...r.kernel.org>, <linux-tegra@...r.kernel.org>, <linux-kernel@...r.kernel.org> Subject: [PATCH, v2] serial: tegra: Add missing clk_disable_unprepare() in tegra_uart_hw_init() 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@...wei.com> --- v2: - it is also missing in tegra_uart_startup() if an error occurs after a successful tegra_uart_hw_init() call, fix it. 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 e5b9773db5e3..1cf08b33456c 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); -- 2.17.1
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