linux-kernel - Re: [PATCH v8 03/13] rpmsg: Move the rpmsg control device from rpmsg_char to rpmsg

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Date:   Tue, 18 Jan 2022 11:44:31 +0100
From:   Arnaud POULIQUEN <arnaud.pouliquen@...s.st.com>
To:     Bjorn Andersson <bjorn.andersson@...aro.org>
CC:     Mathieu Poirier <mathieu.poirier@...aro.org>,
        <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>, <julien.massot@....bzh>
Subject: Re: [PATCH v8 03/13] rpmsg: Move the rpmsg control device from
 rpmsg_char to rpmsg_ctrl

Hello Bjorn,

On 1/17/22 11:55 PM, Bjorn Andersson wrote:
> On Tue 07 Dec 02:08 CST 2021, Arnaud Pouliquen wrote:
>> diff --git a/drivers/rpmsg/rpmsg_char.c b/drivers/rpmsg/rpmsg_char.c
> [..]
>> -static void rpmsg_ctrldev_release_device(struct device *dev)
>> -{
>> -	struct rpmsg_ctrldev *ctrldev = dev_to_ctrldev(dev);
>> -
>> -	ida_simple_remove(&rpmsg_ctrl_ida, dev->id);
>> -	ida_simple_remove(&rpmsg_minor_ida, MINOR(dev->devt));
>> -	cdev_del(&ctrldev->cdev);
>> -	kfree(ctrldev);
>> -}
>> -
>> -static int rpmsg_chrdev_probe(struct rpmsg_device *rpdev)
>> -{
>> -	struct rpmsg_ctrldev *ctrldev;
>> -	struct device *dev;
>> -	int ret;
>> -
>> -	ctrldev = kzalloc(sizeof(*ctrldev), GFP_KERNEL);
>> -	if (!ctrldev)
>> -		return -ENOMEM;
>> -
>> -	ctrldev->rpdev = rpdev;
>> -
>> -	dev = &ctrldev->dev;
>> -	device_initialize(dev);
>> -	dev->parent = &rpdev->dev;
>> -	dev->class = rpmsg_class;
>> -
>> -	cdev_init(&ctrldev->cdev, &rpmsg_ctrldev_fops);
>> -	ctrldev->cdev.owner = THIS_MODULE;
>> -
>> -	ret = ida_simple_get(&rpmsg_minor_ida, 0, RPMSG_DEV_MAX, GFP_KERNEL);
>> -	if (ret < 0)
>> -		goto free_ctrldev;
>> -	dev->devt = MKDEV(MAJOR(rpmsg_major), ret);
>> -
>> -	ret = ida_simple_get(&rpmsg_ctrl_ida, 0, 0, GFP_KERNEL);
>> -	if (ret < 0)
>> -		goto free_minor_ida;
>> -	dev->id = ret;
>> -	dev_set_name(&ctrldev->dev, "rpmsg_ctrl%d", ret);
>> -
>> -	ret = cdev_add(&ctrldev->cdev, dev->devt, 1);
> 
> This turns out to be incomplete and the cdev_del above is in the wrong
> place. This, and the same for eptdev, is being corrected in:
> 
> https://lore.kernel.org/linux-remoteproc/164245960510.1698571.4998090450663669237.b4-ty@linaro.org/T/#t

I will rebase on next branch including this patchset

Thanks,
Arnaud

> 
> Regards,
> Bjorn
>