linux-kernel - Re: [PATCH] drivers: pci: Directly use ida

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Message-ID: <20220527164204.GA481720@bhelgaas>
Date:   Fri, 27 May 2022 11:42:04 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     keliu <liuke94@...wei.com>
Cc:     nirmal.patel@...ux.intel.com, jonathan.derrick@...ux.dev,
        lorenzo.pieralisi@....com, robh@...nel.org, kw@...ux.com,
        bhelgaas@...gle.com, kurt.schwemmer@...rosemi.com,
        logang@...tatee.com, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drivers: pci: Directly use ida_alloc()/free()

On Fri, May 27, 2022 at 07:20:05AM +0000, keliu wrote:
> Use ida_alloc()/ida_free() instead of deprecated
> ida_simple_get()/ida_simple_remove() .
> 
> Signed-off-by: keliu <liuke94@...wei.com>

I see you got some feedback about a full name already (here's a
reference:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/Documentation/process/submitting-patches.rst?id=v5.17#n407)
so I'll wait for the update.  When you do, please also update the
subject line to match previous drivers/pci/ history (use
"git log --oneline drivers/pci/" to see it).

The patch itself looks good to me.  Thanks for doing this!

> ---
>  drivers/pci/controller/vmd.c   | 6 +++---
>  drivers/pci/switch/switchtec.c | 7 +++----
>  2 files changed, 6 insertions(+), 7 deletions(-)
> 
> diff --git a/drivers/pci/controller/vmd.c b/drivers/pci/controller/vmd.c
> index eb05cceab964..efcb3a3ca65e 100644
> --- a/drivers/pci/controller/vmd.c
> +++ b/drivers/pci/controller/vmd.c
> @@ -893,7 +893,7 @@ static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
>  		return -ENOMEM;
>  
>  	vmd->dev = dev;
> -	vmd->instance = ida_simple_get(&vmd_instance_ida, 0, 0, GFP_KERNEL);
> +	vmd->instance = ida_alloc(&vmd_instance_ida, GFP_KERNEL);
>  	if (vmd->instance < 0)
>  		return vmd->instance;
>  
> @@ -934,7 +934,7 @@ static int vmd_probe(struct pci_dev *dev, const struct pci_device_id *id)
>  	return 0;
>  
>   out_release_instance:
> -	ida_simple_remove(&vmd_instance_ida, vmd->instance);
> +	ida_free(&vmd_instance_ida, vmd->instance);
>  	kfree(vmd->name);
>  	return err;
>  }
> @@ -957,7 +957,7 @@ static void vmd_remove(struct pci_dev *dev)
>  	vmd_cleanup_srcu(vmd);
>  	vmd_detach_resources(vmd);
>  	vmd_remove_irq_domain(vmd);
> -	ida_simple_remove(&vmd_instance_ida, vmd->instance);
> +	ida_free(&vmd_instance_ida, vmd->instance);
>  	kfree(vmd->name);
>  }
>  
> diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
> index c36c1238c604..75be4fe22509 100644
> --- a/drivers/pci/switch/switchtec.c
> +++ b/drivers/pci/switch/switchtec.c
> @@ -1376,8 +1376,7 @@ static struct switchtec_dev *stdev_create(struct pci_dev *pdev)
>  	dev->groups = switchtec_device_groups;
>  	dev->release = stdev_release;
>  
> -	minor = ida_simple_get(&switchtec_minor_ida, 0, 0,
> -			       GFP_KERNEL);
> +	minor = ida_alloc(&switchtec_minor_ida, GFP_KERNEL);
>  	if (minor < 0) {
>  		rc = minor;
>  		goto err_put;
> @@ -1692,7 +1691,7 @@ static int switchtec_pci_probe(struct pci_dev *pdev,
>  err_devadd:
>  	stdev_kill(stdev);
>  err_put:
> -	ida_simple_remove(&switchtec_minor_ida, MINOR(stdev->dev.devt));
> +	ida_free(&switchtec_minor_ida, MINOR(stdev->dev.devt));
>  	put_device(&stdev->dev);
>  	return rc;
>  }
> @@ -1704,7 +1703,7 @@ static void switchtec_pci_remove(struct pci_dev *pdev)
>  	pci_set_drvdata(pdev, NULL);
>  
>  	cdev_device_del(&stdev->cdev, &stdev->dev);
> -	ida_simple_remove(&switchtec_minor_ida, MINOR(stdev->dev.devt));
> +	ida_free(&switchtec_minor_ida, MINOR(stdev->dev.devt));
>  	dev_info(&stdev->dev, "unregistered.\n");
>  	stdev_kill(stdev);
>  	put_device(&stdev->dev);
> -- 
> 2.25.1
>