linux-kernel - Re: [PATCH v3 14/21] libnd: blk labels and namespace instantiation

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Date:	Fri, 22 May 2015 11:51:18 -0700
From:	Dan Williams <dan.j.williams@...el.com>
To:	"Elliott, Robert (Server Storage)" <Elliott@...com>
Cc:	"axboe@...nel.dk" <axboe@...nel.dk>,
	"linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>,
	"neilb@...e.de" <neilb@...e.de>,
	"gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"hch@....de" <hch@....de>,
	"linux-acpi@...r.kernel.org" <linux-acpi@...r.kernel.org>,
	"mingo@...nel.org" <mingo@...nel.org>
Subject: Re: [PATCH v3 14/21] libnd: blk labels and namespace instantiation

On Fri, May 22, 2015 at 11:37 AM, Elliott, Robert (Server Storage)
<Elliott@...com> wrote:
>
>> -----Original Message-----
>> From: Linux-nvdimm [mailto:linux-nvdimm-bounces@...ts.01.org] On Behalf Of
>> Dan Williams
>> Sent: Wednesday, May 20, 2015 3:57 PM
>> To: axboe@...nel.dk
>> Cc: linux-nvdimm@...ts.01.org; neilb@...e.de; gregkh@...uxfoundation.org;
>> linux-kernel@...r.kernel.org; hch@....de; linux-acpi@...r.kernel.org;
>> mingo@...nel.org
>> Subject: [PATCH v3 14/21] libnd: blk labels and namespace instantiation
>>
> ...
>> @@ -1029,6 +1244,173 @@ static struct device **create_namespace_pmem(struct
>> nd_region *nd_region)
>>       return NULL;
>>  }
>>
>> +struct resource *nsblk_add_resource(struct nd_region *nd_region,
>> +             struct nd_dimm_drvdata *ndd, struct nd_namespace_blk *nsblk,
>> +             resource_size_t start)
>> +{
>> +     struct nd_label_id label_id;
>> +     struct resource *res;
>> +
>> +     nd_label_gen_id(&label_id, nsblk->uuid, NSLABEL_FLAG_LOCAL);
>> +     nsblk->res = krealloc(nsblk->res,
>> +                     sizeof(void *) * (nsblk->num_resources + 1),
>> +                     GFP_KERNEL);
>> +     if (!nsblk->res)
>> +             return NULL;
>
> scripts/checkpatch.pl doesn't like that:
> WARNING: Reusing the krealloc arg is almost always a bug
> #1411: FILE: drivers/block/nd/namespace_devs.c:1411:
> +       nsblk->res = krealloc(nsblk->res,
>
> The reasoning (https://lkml.org/lkml/2013/3/14/558) is:
>
> "If krealloc() returns NULL, it *doesn't* free the original. So any
> code of the form 'foo = krealloc(foo, …);' is almost certainly a bug."
>

Ok, will fix that up.
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