linux-kernel - RE: [PATCH vfio 2/2] hisi_acc_vfio_pci: Destroy the [state|reset]

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Date:   Fri, 24 Nov 2023 08:51:09 +0000
From:   Shameerali Kolothum Thodi <shameerali.kolothum.thodi@...wei.com>
To:     Brett Creeley <brett.creeley@....com>,
        "jgg@...pe.ca" <jgg@...pe.ca>,
        "yishaih@...dia.com" <yishaih@...dia.com>,
        liulongfang <liulongfang@...wei.com>,
        "kevin.tian@...el.com" <kevin.tian@...el.com>,
        "alex.williamson@...hat.com" <alex.williamson@...hat.com>,
        "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
CC:     "shannon.nelson@....com" <shannon.nelson@....com>
Subject: RE: [PATCH vfio 2/2] hisi_acc_vfio_pci: Destroy the
 [state|reset]_mutex on release



> -----Original Message-----
> From: Brett Creeley [mailto:brett.creeley@....com]
> Sent: 22 November 2023 19:37
> To: jgg@...pe.ca; yishaih@...dia.com; liulongfang
> <liulongfang@...wei.com>; Shameerali Kolothum Thodi
> <shameerali.kolothum.thodi@...wei.com>; kevin.tian@...el.com;
> alex.williamson@...hat.com; kvm@...r.kernel.org;
> linux-kernel@...r.kernel.org
> Cc: shannon.nelson@....com; brett.creeley@....com
> Subject: [PATCH vfio 2/2] hisi_acc_vfio_pci: Destroy the [state|reset]_mutex
> on release
> 
> The [state|reset]_mutex are initialized in vfio init, but
> never destroyed. This isn't required as mutex_destroy()
> doesn't do anything unless lock debugging is enabled.
> However, for completeness, fix it by implementing a
> driver specific release function.
> 
> No fixes tag is added as it doesn't seem worthwhile
> for such a trivial and debug only change.
> 
> Signed-off-by: Brett Creeley <brett.creeley@....com>

Reviewed-by: Shameer Kolothum <shameerali.kolothum.thodi@...wei.com>

Thanks.

> ---
>  drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> index 2c049b8de4b4..dc1e376e1b8a 100644
> --- a/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> +++ b/drivers/vfio/pci/hisilicon/hisi_acc_vfio_pci.c
> @@ -1358,10 +1358,20 @@ static int
> hisi_acc_vfio_pci_migrn_init_dev(struct vfio_device *core_vdev)
>  	return vfio_pci_core_init_dev(core_vdev);
>  }
> 
> +static void hisi_acc_vfio_pci_migrn_release_dev(struct vfio_device
> *core_vdev)
> +{
> +	struct hisi_acc_vf_core_device *hisi_acc_vdev =
> container_of(core_vdev,
> +			struct hisi_acc_vf_core_device, core_device.vdev);
> +
> +	mutex_destroy(&hisi_acc_vdev->reset_mutex);
> +	mutex_destroy(&hisi_acc_vdev->state_mutex);
> +	vfio_pci_core_release_dev(core_vdev);
> +}
> +
>  static const struct vfio_device_ops hisi_acc_vfio_pci_migrn_ops = {
>  	.name = "hisi-acc-vfio-pci-migration",
>  	.init = hisi_acc_vfio_pci_migrn_init_dev,
> -	.release = vfio_pci_core_release_dev,
> +	.release = hisi_acc_vfio_pci_migrn_release_dev,
>  	.open_device = hisi_acc_vfio_pci_open_device,
>  	.close_device = hisi_acc_vfio_pci_close_device,
>  	.ioctl = hisi_acc_vfio_pci_ioctl,
> --
> 2.17.1