From: Alexandre Belloni <alexandre.belloni@bootlin.com>
To: Jiasheng Jiang <jiasheng@iscas.ac.cn>
Cc: arnd@arndb.de, gregkh@linuxfoundation.org,
linux-kernel@vger.kernel.org, codrin.ciubotariu@microchip.com,
claudiu.beznea@microchip.com,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH] misc: atmel-ssc: Handle error for clk_prepare_enable
Date: Wed, 2 Mar 2022 10:48:57 +0100 [thread overview]
Message-ID: <Yh89idAr6BiqqdaM@piout.net> (raw)
In-Reply-To: <20220302084319.96435-1-jiasheng@iscas.ac.cn>
On 02/03/2022 16:43:19+0800, Jiasheng Jiang wrote:
> As the potential failure of the clk_prepare_enable(),
> it should be better to check it and return error if fails.
>
this will never ever fail, this patch doesn't fix any actual issue
> Fixes: eb1f2930609b ("Driver for the Atmel on-chip SSC on AT32AP and AT91")
> Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn>
> ---
> drivers/misc/atmel-ssc.c | 6 +++++-
> 1 file changed, 5 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/misc/atmel-ssc.c b/drivers/misc/atmel-ssc.c
> index d6cd5537126c..c76ca234af4b 100644
> --- a/drivers/misc/atmel-ssc.c
> +++ b/drivers/misc/atmel-ssc.c
> @@ -192,6 +192,7 @@ static int ssc_probe(struct platform_device *pdev)
> struct resource *regs;
> struct ssc_device *ssc;
> const struct atmel_ssc_platform_data *plat_dat;
> + int ret;
>
> ssc = devm_kzalloc(&pdev->dev, sizeof(struct ssc_device), GFP_KERNEL);
> if (!ssc) {
> @@ -226,7 +227,10 @@ static int ssc_probe(struct platform_device *pdev)
> }
>
> /* disable all interrupts */
> - clk_prepare_enable(ssc->clk);
> + ret = clk_prepare_enable(ssc->clk);
> + if (ret)
> + return ret;
> +
> ssc_writel(ssc->regs, IDR, -1);
> ssc_readl(ssc->regs, SR);
> clk_disable_unprepare(ssc->clk);
> --
> 2.25.1
>
--
Alexandre Belloni, co-owner and COO, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
prev parent reply other threads:[~2022-03-02 9:51 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-02 8:43 [PATCH] misc: atmel-ssc: Handle error for clk_prepare_enable Jiasheng Jiang
2022-03-02 9:48 ` Alexandre Belloni [this message]
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=Yh89idAr6BiqqdaM@piout.net \
--to=alexandre.belloni@bootlin.com \
--cc=arnd@arndb.de \
--cc=claudiu.beznea@microchip.com \
--cc=codrin.ciubotariu@microchip.com \
--cc=gregkh@linuxfoundation.org \
--cc=jiasheng@iscas.ac.cn \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=linux-kernel@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).