[v1] serial: tegra: Add missing clk_disable_unprepare() in tegra_uart_hw_init()

[PATCH] serial: tegra: Add missing clk_disable_unprepare() in tegra_uart_hw_init()

Posted by Yi Yang 2 years, 9 months ago

Add the missing clk_disable_unprepare() before return from
tegra_uart_hw_init() in the error handling path.

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@huawei.com>
---
 drivers/tty/serial/serial-tegra.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c
index e5b9773db5e3..abc5039eb273 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;
 	}
-- 
2.17.1

Re: [PATCH] serial: tegra: Add missing clk_disable_unprepare() in tegra_uart_hw_init()

Posted by Christophe JAILLET 2 years, 9 months ago

Le 25/11/2022 à 11:11, Yi Yang a écrit :
> Add the missing clk_disable_unprepare() before return from
> tegra_uart_hw_init() in the error handling path.
> 
> 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-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
> ---
>   drivers/tty/serial/serial-tegra.c | 2 ++
>   1 file changed, 2 insertions(+)
> 

Hi,

I think that it is also missing in tegra_uart_startup() if an error 
occurs after a successful tegra_uart_hw_init() call.

Or maybe (based on function mane) tegra_uart_hw_deinit() should called 
there.

Just my 2c.

CJ


> diff --git a/drivers/tty/serial/serial-tegra.c b/drivers/tty/serial/serial-tegra.c
> index e5b9773db5e3..abc5039eb273 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;
>   	}

Re: [PATCH] serial: tegra: Add missing clk_disable_unprepare() in tegra_uart_hw_init()

Posted by yiyang (D) 2 years, 9 months ago


On 2022/11/25 19:19, Christophe JAILLET wrote:
> Le 25/11/2022 à 11:11, Yi Yang a écrit :
>> Add the missing clk_disable_unprepare() before return from
>> tegra_uart_hw_init() in the error handling path.
>>
>> 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-hv44wF8Li93QT0dZR+AlfA@public.gmane.org>
>> ---
>>   drivers/tty/serial/serial-tegra.c | 2 ++
>>   1 file changed, 2 insertions(+)
>>
> 
> Hi,
> 
> I think that it is also missing in tegra_uart_startup() if an error 
> occurs after a successful tegra_uart_hw_init() call.
> 
> Or maybe (based on function mane) tegra_uart_hw_deinit() should called 
> there.
> 
> Just my 2c.
> 
> CJ
> 

Thanks! I will fix it in v2 patch.

> 
>> diff --git a/drivers/tty/serial/serial-tegra.c 
>> b/drivers/tty/serial/serial-tegra.c
>> index e5b9773db5e3..abc5039eb273 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;
>>       }
> 
> .