linux-kernel - Re: [patch v3 1/1] i2c: add master driver for mellanox systems

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Fri, 4 Nov 2016 00:48:48 +0200
From:   Vladimir Zapolskiy <vz@...ia.com>
To:     vadimp@...lanox.com, wsa@...-dreams.de
Cc:     linux-i2c@...r.kernel.org, linux-kernel@...r.kernel.org,
        jiri@...nulli.us, Michael Shych <michaelsh@...lanox.com>
Subject: Re: [patch v3 1/1] i2c: add master driver for mellanox systems

On 04.11.2016 00:34, Vladimir Zapolskiy wrote:
>> +
>> +static int mlxcpld_i2c_probe(struct platform_device *pdev)
>> +{
>> +	struct mlxcpld_i2c_priv *priv;
>> +	int err;
>> +
>> +	priv = devm_kzalloc(&pdev->dev, sizeof(struct mlxcpld_i2c_priv),
>> +			    GFP_KERNEL);
>> +	if (!priv)
>> +		return -ENOMEM;
>> +
>> +	mutex_init(&priv->lock);
>> +	platform_set_drvdata(pdev, priv);
>> +
>> +	priv->dev = &pdev->dev;
>> +
>> +	/* Register with i2c layer */
>> +	priv->adap = mlxcpld_i2c_adapter;

See a correction below.

>> +	priv->adap.dev.parent = &pdev->dev;
>> +	priv->adap.retries = MLXCPLD_I2C_RETR_NUM;
>> +	priv->adap.nr = MLXCPLD_I2C_BUS_NUM;
> 
> So since you want to allow the registration of only one such controller
> on a board (by the way in the opposite case it is also expected that
> "struct i2c_adapter" is allocated dynamically to avoid rewriting of
> data), you probably know the good reason behind it.

I've just noticed that you do a struct copy-on-assignment, while I think
it is very rarely used in the kernel sources (I don't know why), it cancels
my concern expressed above.

> 
> But in that case you may consider to move .retries and .nr
> instantiation to the "static struct i2c_adapter" declaration above.
> 

--
With best wishes,
Vladimir