linux-kernel - Re: [PATCH] nvme-pci: free irq properly when cannot create adminq

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Message-ID: <Y63WsX8Hvxep/dtN@kbusch-mbp.dhcp.thefacebook.com>
Date:   Thu, 29 Dec 2022 11:04:33 -0700
From:   Keith Busch <kbusch@...nel.org>
To:     Tong Zhang <ztong0001@...il.com>
Cc:     Jens Axboe <axboe@...com>, Christoph Hellwig <hch@....de>,
        Sagi Grimberg <sagi@...mberg.me>,
        Chaitanya Kulkarni <kch@...dia.com>,
        linux-nvme@...ts.infradead.org, linux-kernel@...r.kernel.org,
        t.zhang2@...sung.com
Subject: Re: [PATCH] nvme-pci: free irq properly when cannot create adminq

On Wed, Dec 28, 2022 at 10:05:49PM -0800, Tong Zhang wrote:
> nvme_pci_configure_admin_queue could return -ENODEV, in this case, we
> will need to free IRQ properly. Otherwise following warning could be
> triggered
> 
> [    5.286752] WARNING: CPU: 0 PID: 33 at kernel/irq/irqdomain.c:253 irq_domain_remove+0x12d/0x140
> [    5.290547] Call Trace:
> [    5.290626]  <TASK>
> [    5.290695]  msi_remove_device_irq_domain+0xc9/0xf0
> [    5.290843]  msi_device_data_release+0x15/0x80
> [    5.290978]  release_nodes+0x58/0x90
> [    5.293788] WARNING: CPU: 0 PID: 33 at kernel/irq/msi.c:276 msi_device_data_release+0x76/0x80
> [    5.297573] Call Trace:
> [    5.297651]  <TASK>
> [    5.297719]  release_nodes+0x58/0x90
> [    5.297831]  devres_release_all+0xef/0x140
> [    5.298339]  device_unbind_cleanup+0x11/0xc0
> [    5.298479]  really_probe+0x296/0x320
> 
> Fixes: a6ee7f19ebfd ("nvme-pci: call nvme_pci_configure_admin_queue from nvme_pci_enable")

Right. It's really only needed when called from probe as the reset_work
handles the cleanup when called from there, but this is safe for both
cases.

> @@ -2584,8 +2584,13 @@ static int nvme_pci_enable(struct nvme_dev *dev)
>  	pci_enable_pcie_error_reporting(pdev);
>  	pci_save_state(pdev);
>  
> -	return nvme_pci_configure_admin_queue(dev);
> +	result = nvme_pci_configure_admin_queue(dev);
> +	if (result)
> +		goto free_irq;
> +	return result;

Since you're already in this function, you should also add a "goto
disable" if pci_alloc_irq_vectors() fails. Right now it just returns
with the pci device still enabled, and it won't get disabled from probe.
  
> + free_irq:
> +	pci_free_irq_vectors(pdev);
>   disable:
>  	pci_disable_device(pdev);
>  	return result;
> --