linux-kernel - Re: [PATCH] virtio-blk: fix probe without CONFIG_BLK_DEV_ZONED

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Date:   Wed, 21 Dec 2022 19:32:06 +0000
From:   Lorenzo Stoakes <lstoakes@...il.com>
To:     "Michael S. Tsirkin" <mst@...hat.com>
Cc:     linux-kernel@...r.kernel.org, Jens Axboe <axboe@...nel.dk>,
        Anders Roxell <anders.roxell@...aro.org>,
        virtualization@...ts.linux-foundation.org,
        linux-block@...r.kernel.org, Stefan Hajnoczi <stefanha@...hat.com>,
        Paolo Bonzini <pbonzini@...hat.com>
Subject: Re: [PATCH] virtio-blk: fix probe without CONFIG_BLK_DEV_ZONED

On Tue, Dec 20, 2022 at 06:23:44AM -0500, Michael S. Tsirkin wrote:
> When building without CONFIG_BLK_DEV_ZONED, VIRTIO_BLK_F_ZONED
> is excluded from array of driver features.
> As a result virtio_has_feature panics in virtio_check_driver_offered_feature
> since that by design verifies that a feature we are checking for
> is listed in the feature array.
>
> To fix, replace the call to virtio_has_feature with a stub.
>
> Tested-by: Anders Roxell <anders.roxell@...aro.org>
> Signed-off-by: Michael S. Tsirkin <mst@...hat.com>
> ---
>  drivers/block/virtio_blk.c | 11 ++++++++++-
>  1 file changed, 10 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
> index 88b3639f8536..5ea1dc882a80 100644
> --- a/drivers/block/virtio_blk.c
> +++ b/drivers/block/virtio_blk.c
> @@ -760,6 +760,10 @@ static int virtblk_probe_zoned_device(struct virtio_device *vdev,
>  	return ret;
>  }
>
> +static inline bool virtblk_has_zoned_feature(struct virtio_device *vdev)
> +{
> +	return virtio_has_feature(vdev, VIRTIO_BLK_F_ZONED);
> +}
>  #else
>
>  /*
> @@ -775,6 +779,11 @@ static inline int virtblk_probe_zoned_device(struct virtio_device *vdev,
>  {
>  	return -EOPNOTSUPP;
>  }
> +
> +static inline bool virtblk_has_zoned_feature(struct virtio_device *vdev)
> +{
> +	return false;
> +}
>  #endif /* CONFIG_BLK_DEV_ZONED */
>
>  /* return id (s/n) string for *disk to *id_str
> @@ -1480,7 +1489,7 @@ static int virtblk_probe(struct virtio_device *vdev)
>  	virtblk_update_capacity(vblk, false);
>  	virtio_device_ready(vdev);
>
> -	if (virtio_has_feature(vdev, VIRTIO_BLK_F_ZONED)) {
> +	if (virtblk_has_zoned_feature(vdev)) {
>  		err = virtblk_probe_zoned_device(vdev, vblk, q);
>  		if (err)
>  			goto out_cleanup_disk;
> --
> MST
>
> _______________________________________________
> Virtualization mailing list
> Virtualization@...ts.linux-foundation.org
> https://lists.linuxfoundation.org/mailman/listinfo/virtualization
Tested-by: Lorenzo Stoakes <lstoakes@...il.com>

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