linux-kernel - Re: [PATCH v2 01/11] driver: platform: add and use helper for safer setting of driver

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Message-ID: <bc4f3314-46f2-72a8-f25c-c9774d987ca1@canonical.com>
Date:   Thu, 24 Feb 2022 08:47:22 +0100
From:   Krzysztof Kozlowski <krzysztof.kozlowski@...onical.com>
To:     Bjorn Helgaas <helgaas@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Stuart Yoder <stuyoder@...il.com>,
        Laurentiu Tudor <laurentiu.tudor@....com>,
        Abel Vesa <abel.vesa@....com>, Shawn Guo <shawnguo@...nel.org>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Fabio Estevam <festevam@...il.com>,
        "K. Y. Srinivasan" <kys@...rosoft.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Stephen Hemminger <sthemmin@...rosoft.com>,
        Wei Liu <wei.liu@...nel.org>, Dexuan Cui <decui@...rosoft.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Mathieu Poirier <mathieu.poirier@...aro.org>,
        Vineeth Vijayan <vneethv@...ux.ibm.com>,
        Peter Oberparleiter <oberpar@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Alexander Gordeev <agordeev@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Sven Schnelle <svens@...ux.ibm.com>,
        Andy Gross <agross@...nel.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        Mark Brown <broonie@...nel.org>,
        "Michael S. Tsirkin" <mst@...hat.com>,
        Jason Wang <jasowang@...hat.com>, linux-kernel@...r.kernel.org,
        linux-clk@...r.kernel.org, NXP Linux Team <linux-imx@....com>,
        linux-arm-kernel@...ts.infradead.org, linux-hyperv@...r.kernel.org,
        linux-pci@...r.kernel.org, linux-remoteproc@...r.kernel.org,
        linux-s390@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        alsa-devel@...a-project.org, linux-spi@...r.kernel.org,
        virtualization@...ts.linux-foundation.org,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Rasmus Villemoes <linux@...musvillemoes.dk>
Subject: Re: [PATCH v2 01/11] driver: platform: add and use helper for safer
 setting of driver_override

On 23/02/2022 22:53, Bjorn Helgaas wrote:
> On Wed, Feb 23, 2022 at 08:13:00PM +0100, Krzysztof Kozlowski wrote:
>> Several core drivers and buses expect that driver_override is a
>> dynamically allocated memory thus later they can kfree() it.
>> ...
> 
>> + * set_driver_override() - Helper to set or clear driver override.
> 
> Doesn't match actual function name.

Good point. I wonder why build W=1 did not complain... I need to check.

> 
>> + * @dev: Device to change
>> + * @override: Address of string to change (e.g. &device->driver_override);
>> + *            The contents will be freed and hold newly allocated override.
>> + * @s: NULL terminated string, new driver name to force a match, pass empty
>> + *     string to clear it
>> + *
>> + * Helper to setr or clear driver override in a device, intended for the cases
>> + * when the driver_override field is allocated by driver/bus code.
> 
> s/setr/set/

Right. Thanks for checking.

> 
>> + * Returns: 0 on success or a negative error code on failure.
>> + */
>> +int driver_set_override(struct device *dev, char **override, const char *s)
>> +{


Best regards,
Krzysztof