linux-kernel - Re: [PATCH v3 3/6] PCI: hv: Remove the useless hv_pcichild_state from struct hv_pci

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Message-ID: <ZG8ZQ1U4kmGBVe4/@lpieralisi>
Date:   Thu, 25 May 2023 10:16:03 +0200
From:   Lorenzo Pieralisi <lpieralisi@...nel.org>
To:     Dexuan Cui <decui@...rosoft.com>
Cc:     bhelgaas@...gle.com, davem@...emloft.net, edumazet@...gle.com,
        haiyangz@...rosoft.com, jakeo@...rosoft.com, kuba@...nel.org,
        kw@...ux.com, kys@...rosoft.com, leon@...nel.org,
        linux-pci@...r.kernel.org, mikelley@...rosoft.com,
        pabeni@...hat.com, robh@...nel.org, saeedm@...dia.com,
        wei.liu@...nel.org, longli@...rosoft.com, boqun.feng@...il.com,
        ssengar@...rosoft.com, helgaas@...nel.org,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-rdma@...r.kernel.org, netdev@...r.kernel.org,
        josete@...rosoft.com, stable@...r.kernel.org
Subject: Re: [PATCH v3 3/6] PCI: hv: Remove the useless hv_pcichild_state
 from struct hv_pci_dev

On Wed, Apr 19, 2023 at 07:40:34PM -0700, Dexuan Cui wrote:
> The hpdev->state is never really useful. The only use in
> hv_pci_eject_device() and hv_eject_device_work() is not really necessary.
> 
> Signed-off-by: Dexuan Cui <decui@...rosoft.com>
> Reviewed-by: Michael Kelley <mikelley@...rosoft.com>
> Cc: stable@...r.kernel.org
> ---
> 
> v2:
>   No change to the patch body.
>   Added Cc:stable
> 
> v3:
>   Added Michael's Reviewed-by.
> 
>  drivers/pci/controller/pci-hyperv.c | 12 ------------
>  1 file changed, 12 deletions(-)

Is this patch _required_ for subsequent fixes ? It is not a fix itself
so I am asking.

Acked-by: Lorenzo Pieralisi <lpieralisi@...nel.org>

> diff --git a/drivers/pci/controller/pci-hyperv.c b/drivers/pci/controller/pci-hyperv.c
> index 1b11cf7391933..46df6d093d683 100644
> --- a/drivers/pci/controller/pci-hyperv.c
> +++ b/drivers/pci/controller/pci-hyperv.c
> @@ -553,19 +553,10 @@ struct hv_dr_state {
>  	struct hv_pcidev_description func[];
>  };
>  
> -enum hv_pcichild_state {
> -	hv_pcichild_init = 0,
> -	hv_pcichild_requirements,
> -	hv_pcichild_resourced,
> -	hv_pcichild_ejecting,
> -	hv_pcichild_maximum
> -};
> -
>  struct hv_pci_dev {
>  	/* List protected by pci_rescan_remove_lock */
>  	struct list_head list_entry;
>  	refcount_t refs;
> -	enum hv_pcichild_state state;
>  	struct pci_slot *pci_slot;
>  	struct hv_pcidev_description desc;
>  	bool reported_missing;
> @@ -2750,8 +2741,6 @@ static void hv_eject_device_work(struct work_struct *work)
>  	hpdev = container_of(work, struct hv_pci_dev, wrk);
>  	hbus = hpdev->hbus;
>  
> -	WARN_ON(hpdev->state != hv_pcichild_ejecting);
> -
>  	/*
>  	 * Ejection can come before or after the PCI bus has been set up, so
>  	 * attempt to find it and tear down the bus state, if it exists.  This
> @@ -2808,7 +2797,6 @@ static void hv_pci_eject_device(struct hv_pci_dev *hpdev)
>  		return;
>  	}
>  
> -	hpdev->state = hv_pcichild_ejecting;
>  	get_pcichild(hpdev);
>  	INIT_WORK(&hpdev->wrk, hv_eject_device_work);
>  	queue_work(hbus->wq, &hpdev->wrk);
> -- 
> 2.25.1
>