linux-kernel - RE: [PATCH 16/22] xlink-ipc: Add xlink ipc driver

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Date:   Fri, 11 Dec 2020 11:33:02 +0000
From:   "Kelly, Seamus" <seamus.kelly@...el.com>
To:     Joe Perches <joe@...ches.com>,
        "mgross@...ux.intel.com" <mgross@...ux.intel.com>,
        "markgross@...nel.org" <markgross@...nel.org>,
        "arnd@...db.de" <arnd@...db.de>, "bp@...e.de" <bp@...e.de>,
        "damien.lemoal@....com" <damien.lemoal@....com>,
        "dragan.cvetic@...inx.com" <dragan.cvetic@...inx.com>,
        "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org>,
        "corbet@....net" <corbet@....net>,
        "leonard.crestez@....com" <leonard.crestez@....com>,
        "palmerdabbelt@...gle.com" <palmerdabbelt@...gle.com>,
        "paul.walmsley@...ive.com" <paul.walmsley@...ive.com>,
        "peng.fan@....com" <peng.fan@....com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        Ryan Carnaghi <ryan.r.carnaghi@...el.com>
Subject: RE: [PATCH 16/22] xlink-ipc: Add xlink ipc driver


From: Joe Perches <joe@...ches.com> 
Sent: Monday, December 7, 2020 2:33 AM
To: mgross@...ux.intel.com; markgross@...nel.org; arnd@...db.de; bp@...e.de; damien.lemoal@....com; dragan.cvetic@...inx.com; gregkh@...uxfoundation.org; corbet@....net; leonard.crestez@....com; palmerdabbelt@...gle.com; paul.walmsley@...ive.com; peng.fan@....com; robh+dt@...nel.org; shawnguo@...nel.org
Cc: linux-kernel@...r.kernel.org; Kelly, Seamus <seamus.kelly@...el.com>; linux-doc@...r.kernel.org; Ryan Carnaghi <ryan.r.carnaghi@...el.com>
Subject: Re: [PATCH 16/22] xlink-ipc: Add xlink ipc driver

On Tue, 2020-12-01 at 14:35 -0800, mgross@...ux.intel.com wrote:
> From: Seamus Kelly <seamus.kelly@...el.com>
> 
> Add xLink driver, which interfaces the xLink Core driver with the Keem 
> Bay VPU IPC driver, thus enabling xLink to control and communicate 
> with the VPU IP present on the Intel Keem Bay SoC.

Trivial style comments:

> diff --git a/drivers/misc/xlink-ipc/xlink-ipc.c 
> b/drivers/misc/xlink-ipc/xlink-ipc.c

[]

> +/*
> + * xlink_reserved_memory_init() - Initialize reserved memory for the device.
> + *
> + * @xlink_dev:	[in] The xlink ipc device the reserved memory is allocated to.
> + *
> + * Return: 0 on success, negative error code otherwise.
> + */
> +static int xlink_reserved_memory_init(struct xlink_ipc_dev 
> +*xlink_dev) {
> +	struct device *dev = &xlink_dev->pdev->dev;
> +
> +	xlink_dev->local_xlink_mem.dev = init_xlink_reserved_mem_dev(dev,
> +								     "xlink_local_reserved",
> +								     LOCAL_XLINK_IPC_BUFFER_IDX);
> +	if (!xlink_dev->local_xlink_mem.dev)
> +		return -ENOMEM;

This sort of code, with a repeated struct dereference, generally reads better using a temporary and is also less prone to typo use.

	struct device *dev = &xlink_dev->pdev->dev;
	struct xlink_buf_mem *lxm = &xlink_dev->local_xlink_mem;

	lxm->dev = init_xlink_reserved_mem_dev(dev, "xlink_local_reserved",
					       LOCAL_XLINK_IPC_BUFFER_IDX);
	if (!lxm->dev)
		return -ENOMEM;

> +	xlink_dev->local_xlink_mem.size = get_xlink_reserved_mem_size(dev,
> +								      LOCAL_XLINK_IPC_BUFFER_IDX);

	lxm->size = get_xlink_reserved_mem_size(dev, LOCAL_XLINK_IPC_BUFFER_IDX);

etc...

[Kelly, Seamus] Thank you!  will do.



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