linux-kernel.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: Dongsheng Yang <dongsheng.yang@easystack.cn>
To: Chaitanya Kulkarni <chaitanyak@nvidia.com>,
	"dan.j.williams@intel.com" <dan.j.williams@intel.com>,
	"axboe@kernel.dk" <axboe@kernel.dk>
Cc: "linux-block@vger.kernel.org" <linux-block@vger.kernel.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"linux-cxl@vger.kernel.org" <linux-cxl@vger.kernel.org>,
	Dongsheng Yang <dongsheng.yang.linux@gmail.com>
Subject: Re: [PATCH 2/7] cbd: introduce cbd_transport
Date: Wed, 24 Apr 2024 16:43:47 +0800	[thread overview]
Message-ID: <7ec61a75-79ec-94db-ebf9-58679c85edeb@easystack.cn> (raw)
In-Reply-To: <780f3ccd-5112-4948-81c3-3144c6779503@nvidia.com>



在 2024/4/24 星期三 下午 12:08, Chaitanya Kulkarni 写道:
>> +static ssize_t cbd_myhost_show(struct device *dev,
>> +			       struct device_attribute *attr,
>> +			       char *buf)
>> +{
>> +	struct cbd_transport *cbdt;
>> +	struct cbd_host *host;
>> +
>> +	cbdt = container_of(dev, struct cbd_transport, device);
>> +
>> +	host = cbdt->host;
>> +	if (!host)
>> +		return 0;
>> +
>> +	return sprintf(buf, "%d\n", host->host_id);
> 
> snprintf() ?

IMO, it will only print a decimal unsigned int, so it shouldn't overflow 
the buffer.
> 
>> +}
>> +
>> +static DEVICE_ATTR(my_host_id, 0400, cbd_myhost_show, NULL);
>> +
>> +enum {
> 
> [...]
> 
>> +
>> +static ssize_t cbd_adm_store(struct device *dev,
>> +				 struct device_attribute *attr,
>> +				 const char *ubuf,
>> +				 size_t size)
>> +{
>> +	int ret;
>> +	char *buf;
>> +	struct cbd_adm_options opts = { 0 };
>> +	struct cbd_transport *cbdt;
>> +
> 
> reverse tree order that matches rest of your code ?

Agreed,
> 
>> +	if (!capable(CAP_SYS_ADMIN))
>> +		return -EPERM;
>> +
>> +	cbdt = container_of(dev, struct cbd_transport, device);
>> +
>> +	buf = kmemdup(ubuf, size + 1, GFP_KERNEL);
>> +	if (IS_ERR(buf)) {
>> +		pr_err("failed to dup buf for adm option: %d", (int)PTR_ERR(buf));
>> +		return PTR_ERR(buf);
>> +	}
>> +	buf[size] = '\0';
>> +	ret = parse_adm_options(cbdt, buf, &opts);
>> +	if (ret < 0) {
>> +		kfree(buf);
>> +		return ret;
>> +	}
>> +	kfree(buf);
>> +
> 
> standard format is using goto out and having only on kfree()
> at the end of the function ...

Okey, having a unified error handling path is a good idea, and it's 
suitable here as well, thanx.
> 
>> +	switch (opts.op) {
>> +	case CBDT_ADM_OP_B_START:
>> +		break;
>> +	case CBDT_ADM_OP_B_STOP:
>> +		break;
>> +	case CBDT_ADM_OP_B_CLEAR:
>> +		break;
>> +	case CBDT_ADM_OP_DEV_START:
>> +		break;
>> +	case CBDT_ADM_OP_DEV_STOP:
>> +		break;
>> +	default:
>> +		pr_err("invalid op: %d\n", opts.op);
>> +		return -EINVAL;
>> +	}
>> +
>> +	if (ret < 0)
>> +		return ret;
>> +
>> +	return size;
>> +}
>> +
> 
> [...]
> 
>> +static struct cbd_transport *cbdt_alloc(void)
>> +{
>> +	struct cbd_transport *cbdt;
>> +	int ret;
>> +
>> +	cbdt = kzalloc(sizeof(struct cbd_transport), GFP_KERNEL);
>> +	if (!cbdt) {
>> +		return NULL;
>> +	}
> 
> no braces needed for single statements in if ... applies rest of
> the code ...

thanx, Iwill remove unnecessary braces next version.
> 
> -ck
> 
> 

  reply	other threads:[~2024-04-24 15:52 UTC|newest]

Thread overview: 52+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2024-04-22  7:15 [PATCH RFC 0/7] block: Introduce CBD (CXL Block Device) Dongsheng Yang
2024-04-22  7:16 ` [PATCH 1/7] block: Init for CBD(CXL " Dongsheng Yang
2024-04-22 18:39   ` Randy Dunlap
2024-04-22 22:41     ` Dongsheng Yang
2024-04-24  3:58   ` Chaitanya Kulkarni
2024-04-24  8:36     ` Dongsheng Yang
2024-04-22  7:16 ` [PATCH 2/7] cbd: introduce cbd_transport Dongsheng Yang
2024-04-24  4:08   ` Chaitanya Kulkarni
2024-04-24  8:43     ` Dongsheng Yang [this message]
2024-04-22  7:16 ` [PATCH 3/7] cbd: introduce cbd_channel Dongsheng Yang
2024-04-22  7:16 ` [PATCH 4/7] cbd: introduce cbd_host Dongsheng Yang
2024-04-25  5:51   ` [EXTERNAL] " Bharat Bhushan
2024-04-22  7:16 ` [PATCH 5/7] cbd: introuce cbd_backend Dongsheng Yang
2024-04-24  5:03   ` Chaitanya Kulkarni
2024-04-24  8:36     ` Dongsheng Yang
2024-04-25  5:46   ` [EXTERNAL] " Bharat Bhushan
2024-04-22  7:16 ` [PATCH 7/7] cbd: add related sysfs files in transport register Dongsheng Yang
2024-04-25  5:24   ` [EXTERNAL] " Bharat Bhushan
2024-04-22 22:42 ` [PATCH 6/7] cbd: introduce cbd_blkdev Dongsheng Yang
2024-04-23  7:27   ` Dongsheng Yang
2024-04-24  4:29 ` [PATCH RFC 0/7] block: Introduce CBD (CXL Block Device) Dan Williams
2024-04-24  6:33   ` Dongsheng Yang
2024-04-24 15:14     ` Gregory Price
2024-04-26  1:25       ` Dongsheng Yang
2024-04-26 13:48         ` Gregory Price
2024-04-26 14:53           ` Dongsheng Yang
2024-04-26 16:14             ` Gregory Price
2024-04-28  5:47               ` Dongsheng Yang
2024-04-28 16:44                 ` Gregory Price
2024-04-28 16:55                 ` John Groves
2024-05-03  9:52                   ` Jonathan Cameron
2024-05-08 11:39                     ` Dongsheng Yang
2024-05-08 12:11                       ` Jonathan Cameron
2024-05-08 13:03                         ` Dongsheng Yang
2024-05-08 15:44                           ` Jonathan Cameron
2024-05-09 11:24                             ` Dongsheng Yang
2024-05-09 12:21                               ` Jonathan Cameron
2024-05-09 13:03                                 ` Dongsheng Yang
2024-05-21 18:41                                   ` Dan Williams
2024-05-22  6:17                                     ` Dongsheng Yang
2024-05-29 15:25                                       ` Gregory Price
2024-05-30  6:59                                         ` Dongsheng Yang
2024-05-30 13:38                                           ` Jonathan Cameron
2024-06-01  3:22                                             ` Dan Williams
2024-06-03 12:48                                               ` Jonathan Cameron
2024-06-03 17:28                                                 ` James Morse
2024-06-04 14:26                                                   ` Jonathan Cameron
2024-05-31 14:23                                           ` Gregory Price
2024-06-03  1:33                                             ` Dongsheng Yang
2024-04-30  0:34                 ` Dan Williams
2024-04-24 18:08     ` Dan Williams
     [not found]       ` <539c1323-68f9-d753-a102-692b69049c20@easystack.cn>
2024-04-30  0:10         ` Dan Williams

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=7ec61a75-79ec-94db-ebf9-58679c85edeb@easystack.cn \
    --to=dongsheng.yang@easystack.cn \
    --cc=axboe@kernel.dk \
    --cc=chaitanyak@nvidia.com \
    --cc=dan.j.williams@intel.com \
    --cc=dongsheng.yang.linux@gmail.com \
    --cc=linux-block@vger.kernel.org \
    --cc=linux-cxl@vger.kernel.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).