linux-kernel - Re: [PATCH v2] drivers: pci: Directly use ida

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Date:   Thu, 9 Jun 2022 12:31:02 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Ke Liu <liuke94@...wei.com>
Cc:     bhelgaas@...gle.com, nirmal.patel@...ux.intel.com,
        jonathan.derrick@...ux.dev, lpieralisi@...nel.org, robh@...nel.org,
        kw@...ux.com, kurt.schwemmer@...rosemi.com, logang@...tatee.com,
        linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] drivers: pci: Directly use ida_alloc()/free()

On Thu, Jun 02, 2022 at 07:11:15AM +0000, Ke Liu wrote:
> Use ida_alloc()/ida_free() instead of deprecated
> ida_simple_get()/ida_simple_remove().
> 
> Signed-off-by: Ke Liu <liuke94@...wei.com>

I split the switchtec part off and applied it with Logan's ack to
pci/ctrl/switchtec for v5.20, thanks!

  PCI: switchtec: Prefer ida_alloc()/free() over ida_simple_get()/remove()

I'll apply the vmd part as soon as one of those folks pipes up.

> ---
> v2	fix sign-off name suggest by Bjorn Helgaas
> ---
>  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 94a14a3d7e55..49c72c2d8fe7 100644
> --- a/drivers/pci/controller/vmd.c
> +++ b/drivers/pci/controller/vmd.c
> @@ -894,7 +894,7 @@ 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;
>  
> @@ -935,7 +935,7 @@ 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;
>  }
> @@ -958,7 +958,7 @@ 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
>