linux-kernel - RE: [PATCH v18 01/19] EDAC: Add support for EDAC device features control

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Message-ID: <072a03a818d94c6abd606ab5e0833002@huawei.com>
Date: Mon, 6 Jan 2025 14:48:12 +0000
From: Shiju Jose <shiju.jose@...wei.com>
To: Borislav Petkov <bp@...en8.de>
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Subject: RE: [PATCH v18 01/19] EDAC: Add support for EDAC device features
 control


>-----Original Message-----
>From: Borislav Petkov <bp@...en8.de>
>Sent: 06 January 2025 13:38
>To: Shiju Jose <shiju.jose@...wei.com>
>Cc: linux-edac@...r.kernel.org; linux-cxl@...r.kernel.org; linux-
>acpi@...r.kernel.org; linux-mm@...ck.org; linux-kernel@...r.kernel.org;
>tony.luck@...el.com; rafael@...nel.org; lenb@...nel.org;
>mchehab@...nel.org; dan.j.williams@...el.com; dave@...olabs.net; Jonathan
>Cameron <jonathan.cameron@...wei.com>; dave.jiang@...el.com;
>alison.schofield@...el.com; vishal.l.verma@...el.com; ira.weiny@...el.com;
>david@...hat.com; Vilas.Sridharan@....com; leo.duran@....com;
>Yazen.Ghannam@....com; rientjes@...gle.com; jiaqiyan@...gle.com;
>Jon.Grimm@....com; dave.hansen@...ux.intel.com;
>naoya.horiguchi@....com; james.morse@....com; jthoughton@...gle.com;
>somasundaram.a@....com; erdemaktas@...gle.com; pgonda@...gle.com;
>duenwen@...gle.com; gthelen@...gle.com;
>wschwartz@...erecomputing.com; dferguson@...erecomputing.com;
>wbs@...amperecomputing.com; nifan.cxl@...il.com; tanxiaofei
><tanxiaofei@...wei.com>; Zengtao (B) <prime.zeng@...ilicon.com>; Roberto
>Sassu <roberto.sassu@...wei.com>; kangkang.shen@...urewei.com;
>wanghuiqiang <wanghuiqiang@...wei.com>; Linuxarm
><linuxarm@...wei.com>
>Subject: Re: [PATCH v18 01/19] EDAC: Add support for EDAC device features
>control
>
>On Mon, Jan 06, 2025 at 12:09:57PM +0000, shiju.jose@...wei.com wrote:
>> +int edac_dev_register(struct device *parent, char *name,
>> +		      void *private, int num_features,
>> +		      const struct edac_dev_feature *ras_features) {
>> +	const struct attribute_group **ras_attr_groups;
>> +	struct edac_dev_feat_ctx *ctx;
>> +	int attr_gcnt = 0;
>> +	int ret, feat;
>> +
>> +	if (!parent || !name || !num_features || !ras_features)
>> +		return -EINVAL;
>> +
>> +	/* Double parse to make space for attributes */
>> +	for (feat = 0; feat < num_features; feat++) {
>> +		switch (ras_features[feat].ft_type) {
>> +		/* Add feature specific code */
>> +		default:
>> +			return -EINVAL;
>> +		}
>> +	}
>> +
>> +	ctx = kzalloc(sizeof(*ctx), GFP_KERNEL);
>> +	if (!ctx)
>> +		return -ENOMEM;
>> +
>> +	ras_attr_groups = kcalloc(attr_gcnt + 1, sizeof(*ras_attr_groups),
>GFP_KERNEL);
>> +	if (!ras_attr_groups) {
>> +		ret = -ENOMEM;
>> +		goto ctx_free;
>> +	}
>> +
>> +	attr_gcnt = 0;
>> +	for (feat = 0; feat < num_features; feat++, ras_features++) {
>> +		switch (ras_features->ft_type) {
>> +		/* Add feature specific code */
>> +		default:
>> +			ret = -EINVAL;
>> +			goto groups_free;
>> +		}
>> +	}
>> +
>> +	ctx->dev.parent = parent;
>> +	ctx->dev.bus = edac_get_sysfs_subsys();
>> +	ctx->dev.type = &edac_dev_type;
>> +	ctx->dev.groups = ras_attr_groups;
>> +	ctx->private = private;
>> +	dev_set_drvdata(&ctx->dev, ctx);
>> +
>> +	ret = dev_set_name(&ctx->dev, name);
>> +	if (ret)
>> +		goto groups_free;
>> +
>> +	ret = device_register(&ctx->dev);
>> +	if (ret) {
>> +		put_device(&ctx->dev);
>> +		return ret;
>
>Who is freeing ctx and ras_attr_groups when you return here?

Hi Boris,

ctx and ras_attr_groups are freed in the callback
function  for release  edac_dev_release(struct device *dev).

Thanks,
Shiju

>
>--
>Regards/Gruss,
>    Boris.
>
>https://people.kernel.org/tglx/notes-about-netiquette