linux-kernel - Re: [PATCH v5 1/1] powerpc/pseries: Interface to represent PAPR firmware attributes

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Message-ID: <de3c5540-2a07-8373-57a2-a89e3d304413@linux.ibm.com>
Date:   Tue, 20 Jul 2021 10:34:22 +0530
From:   Pratik Sampat <psampat@...ux.ibm.com>
To:     Fabiano Rosas <farosas@...ux.ibm.com>, mpe@...erman.id.au,
        benh@...nel.crashing.org, paulus@...ba.org,
        linuxppc-dev@...ts.ozlabs.org, kvm-ppc@...r.kernel.org,
        linux-kernel@...r.kernel.org, pratik.r.sampat@...il.com
Subject: Re: [PATCH v5 1/1] powerpc/pseries: Interface to represent PAPR
 firmware attributes



On 20/07/21 12:39 am, Fabiano Rosas wrote:
> "Pratik R. Sampat" <psampat@...ux.ibm.com> writes:
>
>> +	pgs = kcalloc(num_attrs, sizeof(*pgs), GFP_KERNEL);
>> +	if (!pgs)
>> +		goto out;
>> +
>> +	papr_kobj = kobject_create_and_add("papr", firmware_kobj);
>> +	if (!papr_kobj) {
>> +		pr_warn("kobject_create_and_add papr failed\n");
>> +		goto out_pgs;
>> +	}
>> +
>> +	esi_kobj = kobject_create_and_add("energy_scale_info", papr_kobj);
>> +	if (!esi_kobj) {
>> +		pr_warn("kobject_create_and_add energy_scale_info failed\n");
>> +		goto out_kobj;
>> +	}
>> +
>> +	for (idx = 0; idx < num_attrs; idx++) {
>> +		bool show_val_desc = true;
>> +
>> +		pgs[idx].pg.attrs = kcalloc(MAX_ATTRS + 1,
>> +					    sizeof(*pgs[idx].pg.attrs),
>> +					    GFP_KERNEL);
>> +		if (!pgs[idx].pg.attrs) {
>> +			for (i = idx - 1; i >= 0; i--)
>> +				kfree(pgs[i].pg.attrs);
> What about the pg.name from the previous iterations?
>
>> +			goto out_ekobj;
>> +		}
>> +
>> +		pgs[idx].pg.name = kasprintf(GFP_KERNEL, "%lld",
>> +					     be64_to_cpu(esi_attrs[idx].id));
>> +		if (pgs[idx].pg.name == NULL) {
>> +			for (i = idx; i >= 0; i--)
>> +				kfree(pgs[i].pg.attrs);
> Here too.
>
> You could just 'goto out_pgattrs' in both cases.

Yeah, you're right. I may have over-complicated the free, in case of
failure in both the cases above I could just free from "out_pgattrs"
with no issues

>> +			goto out_ekobj;
>> +		}
>> +		/* Do not add the value description if it does not exist */
>> +		if (strnlen(esi_attrs[idx].value_desc,
>> +			    sizeof(esi_attrs[idx].value_desc)) == 0)
>> +			show_val_desc = false;
>> +
>> +		if (add_attr_group(be64_to_cpu(esi_attrs[idx].id), &pgs[idx],
>> +				   show_val_desc)) {
>> +			pr_warn("Failed to create papr attribute group %s\n",
>> +				pgs[idx].pg.name);
>> +			goto out_pgattrs;
>> +		}
>> +	}
>> +
>> +	kfree(esi_buf);
>> +	return 0;
>> +
>> +out_pgattrs:
>> +	for (i = 0; i < num_attrs ; i++) {
>> +		kfree(pgs[i].pg.attrs);
>> +		kfree(pgs[i].pg.name);
>> +	}
>> +out_ekobj:
>> +	kobject_put(esi_kobj);
>> +out_kobj:
>> +	kobject_put(papr_kobj);
>> +out_pgs:
>> +	kfree(pgs);
>> +out:
>> +	kfree(esi_buf);
>> +
>> +	return -ENOMEM;
>> +}
>> +
>> +machine_device_initcall(pseries, papr_init);