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Date:   Fri, 10 Jun 2022 15:50:18 +0200
From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     Pascal Terjan <pterjan@google.com>
Cc:     Hans de Goede <hdegoede@redhat.com>, Arnd Bergmann <arnd@arndb.de>,
        linux-kernel@vger.kernel.org
Subject: Re: [PATCH] vboxguest: add missing devm_free_irq
Message-ID: <YqNMGgwsjhB7TNzk@kroah.com>
References: <20220609134057.2485190-1-pterjan@google.com>
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On Thu, Jun 09, 2022 at 02:40:57PM +0100, Pascal Terjan wrote:
> This fixes the following warning when unloading the module:
> 
> [249348.837181] remove_proc_entry: removing non-empty directory 'irq/20', leaking at least 'vboxguest'
> [249348.837219] WARNING: CPU: 0 PID: 6708 at fs/proc/generic.c:715 remove_proc_entry+0x119/0x140
> 
> [249348.837379] Call Trace:
> [249348.837385]  unregister_irq_proc+0xbd/0xe0
> [249348.837392]  free_desc+0x23/0x60
> [249348.837396]  irq_free_descs+0x4a/0x70
> [249348.837401]  irq_domain_free_irqs+0x160/0x1a0
> [249348.837452]  mp_unmap_irq+0x5c/0x60
> [249348.837458]  acpi_unregister_gsi_ioapic+0x29/0x40
> [249348.837463]  acpi_unregister_gsi+0x17/0x30
> [249348.837467]  acpi_pci_irq_disable+0xbf/0xe0
> [249348.837473]  pcibios_disable_device+0x20/0x30
> [249348.837478]  pci_disable_device+0xef/0x120
> [249348.837482]  vbg_pci_remove+0x6c/0x70 [vboxguest]
> 
> Signed-off-by: Pascal Terjan <pterjan@google.com>
> ---
>  drivers/virt/vboxguest/vboxguest_linux.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/virt/vboxguest/vboxguest_linux.c b/drivers/virt/vboxguest/vboxguest_linux.c
> index 6e8c0f1c1056..faa4bc9f625c 100644
> --- a/drivers/virt/vboxguest/vboxguest_linux.c
> +++ b/drivers/virt/vboxguest/vboxguest_linux.c
> @@ -423,6 +423,7 @@ static void vbg_pci_remove(struct pci_dev *pci)
>  	vbg_gdev = NULL;
>  	mutex_unlock(&vbg_gdev_mutex);
>  
> +	devm_free_irq(gdev->dev, pci->irq, gdev);

The whope point of using devm_* calls is so you don't have to do stuff
like this.  Perhaps this should not be using devm_() for the irq at all?

thanks,

greg k-h