linux-kernel - RE: [PATCH v2] serial: samsung: Checks the return value of function

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Date:   Mon, 5 Jul 2021 16:34:05 +0530
From:   "M Tamseel Shams" <m.shams@...sung.com>
To:     "'Krzysztof Kozlowski'" <krzysztof.kozlowski@...onical.com>,
        <gregkh@...uxfoundation.org>, <jirislaby@...nel.org>
Cc:     <linux-arm-kernel@...ts.infradead.org>,
        <linux-samsung-soc@...r.kernel.org>,
        <linux-serial@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <alim.akhtar@...sung.com>
Subject: RE: [PATCH v2] serial: samsung: Checks the return value of function



> -----Original Message-----
> From: Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
> Sent: Thursday, July 1, 2021 12:06 PM
> To: Tamseel Shams <m.shams@...sung.com>; gregkh@...uxfoundation.org;
> jirislaby@...nel.org
> Cc: linux-arm-kernel@...ts.infradead.org; linux-samsung-soc@...r.kernel.org;
> linux-serial@...r.kernel.org; linux-kernel@...r.kernel.org;
> alim.akhtar@...sung.com
> Subject: Re: [PATCH v2] serial: samsung: Checks the return value of function
> 
> On 30/06/2021 15:33, Tamseel Shams wrote:
> > "uart_add_one_port" function call may fail and return some error code,
> > so adding a check for return value.
> > If it is returning some error code, then displaying the result,
> > unregistering the driver and then returning from probe function with
> > error code.
> >
> > Signed-off-by: Tamseel Shams <m.shams@...sung.com>
> > ---
> > Changes since v1:
> > 1. Added support to unregister driver on failure of "uart_add_onr_port"
> > function call.
> > 2. Commit message updated.
> >
> >  drivers/tty/serial/samsung_tty.c | 11 ++++++++++-
> >  1 file changed, 10 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/tty/serial/samsung_tty.c
> > b/drivers/tty/serial/samsung_tty.c
> > index 9fbc61151c2e..188e2d2da201 100644
> > --- a/drivers/tty/serial/samsung_tty.c
> > +++ b/drivers/tty/serial/samsung_tty.c
> > @@ -2253,7 +2253,11 @@ static int s3c24xx_serial_probe(struct
> platform_device *pdev)
> >  	}
> >
> >  	dev_dbg(&pdev->dev, "%s: adding port\n", __func__);
> > -	uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
> > +	ret = uart_add_one_port(&s3c24xx_uart_drv, &ourport->port);
> > +	if (ret < 0) {
> > +		dev_err(&pdev->dev, "Failed to add uart port, err %d\n", ret);
> > +		goto add_port_error;
> > +	}
> >  	platform_set_drvdata(pdev, &ourport->port);
> >
> >  	/*
> > @@ -2272,6 +2276,11 @@ static int s3c24xx_serial_probe(struct
> platform_device *pdev)
> >  	probe_index++;
> >
> >  	return 0;
> > +
> > +add_port_error:
> 
> You did not unwind fully s3c24xx_serial_init_port() - clocks.
> 
Hi Krzysztof,

Yeah, missed the unwinding of clocks.
Will fix this in next version.

Thanks & Regards,
Tamseel Shams