linux-kernel - Re: [PATCH] serial: 8250_bcm2835aux: Restore clock error handling

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Date: Tue, 9 Jan 2024 18:01:58 -0600
From: Jeremy Linton <jeremy.linton@....com>
To: Stefan Wahren <wahrenst@....net>,
 Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
 Jiri Slaby <jirislaby@...nel.org>,
 Florian Fainelli <florian.fainelli@...adcom.com>
Cc: Ray Jui <rjui@...adcom.com>, Scott Branden <sbranden@...adcom.com>,
 Adrien Thierry <athierry@...hat.com>, linux-serial@...r.kernel.org,
 bcm-kernel-feedback-list@...adcom.com, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org
Subject: Re: [PATCH] serial: 8250_bcm2835aux: Restore clock error handling

Hi,


On 12/20/23 05:43, Stefan Wahren wrote:
> The commit fcc446c8aa63 ("serial: 8250_bcm2835aux: Add ACPI support")
> dropped the error handling for clock acquiring. But even an optional
> clock needs this.

Right, the call was changed to _optional() during review but the error 
handling didn't get put back.

> 
> Fixes: fcc446c8aa63 ("serial: 8250_bcm2835aux: Add ACPI support")
> Signed-off-by: Stefan Wahren <wahrenst@....net>
> ---
>   drivers/tty/serial/8250/8250_bcm2835aux.c | 2 ++
>   1 file changed, 2 insertions(+)
> 
> diff --git a/drivers/tty/serial/8250/8250_bcm2835aux.c b/drivers/tty/serial/8250/8250_bcm2835aux.c
> index 15a2387a5b25..4f4502fb5454 100644
> --- a/drivers/tty/serial/8250/8250_bcm2835aux.c
> +++ b/drivers/tty/serial/8250/8250_bcm2835aux.c
> @@ -119,6 +119,8 @@ static int bcm2835aux_serial_probe(struct platform_device *pdev)
> 
>   	/* get the clock - this also enables the HW */
>   	data->clk = devm_clk_get_optional(&pdev->dev, NULL);
> +	if (IS_ERR(data->clk))
> +		return dev_err_probe(&pdev->dev, PTR_ERR(data->clk), "could not get clk\n");
> 
>   	/* get the interrupt */
>   	ret = platform_get_irq(pdev, 0);
> --

And on ACPI machines it returns NULL, which passes the error check now, 
so it works on an ACPI based pi.

Thanks!

Reviewed-by: Jeremy Linton <jeremy.linton@....com>
Tested-by: Jeremy Linton <jeremy.linton@....com>