linux-kernel - RE: [PATCH 5/6] PCI: hv: Add a per-bus mutex state

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Date:   Wed, 29 Mar 2023 16:41:59 +0000
From:   "Michael Kelley (LINUX)" <mikelley@...rosoft.com>
To:     Dexuan Cui <decui@...rosoft.com>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "davem@...emloft.net" <davem@...emloft.net>,
        "edumazet@...gle.com" <edumazet@...gle.com>,
        Haiyang Zhang <haiyangz@...rosoft.com>,
        Jake Oshins <jakeo@...rosoft.com>,
        "kuba@...nel.org" <kuba@...nel.org>, "kw@...ux.com" <kw@...ux.com>,
        KY Srinivasan <kys@...rosoft.com>,
        "leon@...nel.org" <leon@...nel.org>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "lpieralisi@...nel.org" <lpieralisi@...nel.org>,
        "pabeni@...hat.com" <pabeni@...hat.com>,
        "robh@...nel.org" <robh@...nel.org>,
        "saeedm@...dia.com" <saeedm@...dia.com>,
        "wei.liu@...nel.org" <wei.liu@...nel.org>,
        Long Li <longli@...rosoft.com>,
        "boqun.feng@...il.com" <boqun.feng@...il.com>
CC:     "linux-hyperv@...r.kernel.org" <linux-hyperv@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: RE: [PATCH 5/6] PCI: hv: Add a per-bus mutex state_lock

From: Dexuan Cui <decui@...rosoft.com> Sent: Monday, March 27, 2023 9:51 PM
> 

[snip]

> @@ -3945,20 +3962,26 @@ static int hv_pci_resume(struct hv_device *hdev)
>  	if (ret)
>  		goto out;
> 
> +	mutex_lock(&hbus->state_lock);
> +
>  	ret = hv_pci_enter_d0(hdev);
>  	if (ret)
>  		goto out;

Shouldn't this be goto release_state_lock?

> 
>  	ret = hv_send_resources_allocated(hdev);
>  	if (ret)
> -		goto out;
> +		goto release_state_lock;
> 
>  	prepopulate_bars(hbus);
> 
>  	hv_pci_restore_msi_state(hbus);
> 
>  	hbus->state = hv_pcibus_installed;
> +	mutex_unlock(&hbus->state_lock);
>  	return 0;
> +
> +release_state_lock:
> +	mutex_unlock(&hbus->state_lock);
>  out:
>  	vmbus_close(hdev->channel);
>  	return ret;
> --
> 2.25.1