linux-kernel - Re: [PATCH] virtio-mmio: Use to_virtio_mmio

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Date:   Sun, 21 Feb 2021 06:26:35 -0500
From:   "Michael S. Tsirkin" <mst@...hat.com>
To:     Tang Bin <tangbin@...s.chinamobile.com>
Cc:     Jason Wang <jasowang@...hat.com>,
        virtualization@...ts.linux-foundation.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] virtio-mmio: Use to_virtio_mmio_device() to simply code

On Thu, Feb 18, 2021 at 09:34:08AM +0800, Tang Bin wrote:
> Dear Jason：
> 
>       Sorry for the late reply this email.
> 
> 在 2021/2/10 16:09, Jason Wang 写道:
> > 
> > On 2021/2/10 上午11:04, Tang Bin wrote:
> > > The file virtio_mmio.c has defined the function to_virtio_mmio_device,
> > > so use it instead of container_of() to simply code. And remove
> > > superfluous blank lines in this file.
> > > 
> > > Signed-off-by: Tang Bin <tangbin@...s.chinamobile.com>
> > > ---
> > >   drivers/virtio/virtio_mmio.c | 16 +---------------
> > >   1 file changed, 1 insertion(+), 15 deletions(-)
> > > 
> > > diff --git a/drivers/virtio/virtio_mmio.c b/drivers/virtio/virtio_mmio.c
> > > index 627ac0487..449d0f209 100644
> > > --- a/drivers/virtio/virtio_mmio.c
> > > +++ b/drivers/virtio/virtio_mmio.c
> > > @@ -69,14 +69,10 @@
> > >   #include <uapi/linux/virtio_mmio.h>
> > >   #include <linux/virtio_ring.h>
> > >   -
> > > -
> > 
> > 
> > It's better not mix the patch with style changes.
> > 
> > Other looks good.
> > 
> > Thanks
> 
> Whether should I send patch V2？
> 
> Thanks


Please do.

> > 
> > 
> > >   /* The alignment to use between consumer and producer parts of vring.
> > >    * Currently hardcoded to the page size. */
> > >   #define VIRTIO_MMIO_VRING_ALIGN        PAGE_SIZE
> > >   -
> > > -
> > >   #define to_virtio_mmio_device(_plat_dev) \
> > >       container_of(_plat_dev, struct virtio_mmio_device, vdev)
> > >   @@ -100,8 +96,6 @@ struct virtio_mmio_vq_info {
> > >       struct list_head node;
> > >   };
> > >   -
> > > -
> > >   /* Configuration interface */
> > >     static u64 vm_get_features(struct virtio_device *vdev)
> > > @@ -264,8 +258,6 @@ static void vm_reset(struct virtio_device *vdev)
> > >       writel(0, vm_dev->base + VIRTIO_MMIO_STATUS);
> > >   }
> > >   -
> > > -
> > >   /* Transport interface */
> > >     /* the notify function used when creating a virt queue */
> > > @@ -307,8 +299,6 @@ static irqreturn_t vm_interrupt(int irq, void
> > > *opaque)
> > >       return ret;
> > >   }
> > >   -
> > > -
> > >   static void vm_del_vq(struct virtqueue *vq)
> > >   {
> > >       struct virtio_mmio_device *vm_dev =
> > > to_virtio_mmio_device(vq->vdev);
> > > @@ -512,13 +502,11 @@ static const struct virtio_config_ops
> > > virtio_mmio_config_ops = {
> > >       .bus_name    = vm_bus_name,
> > >   };
> > >   -
> > >   static void virtio_mmio_release_dev(struct device *_d)
> > >   {
> > >       struct virtio_device *vdev =
> > >               container_of(_d, struct virtio_device, dev);
> > > -    struct virtio_mmio_device *vm_dev =
> > > -            container_of(vdev, struct virtio_mmio_device, vdev);
> > > +    struct virtio_mmio_device *vm_dev = to_virtio_mmio_device(vdev);
> > >       struct platform_device *pdev = vm_dev->pdev;
> > >         devm_kfree(&pdev->dev, vm_dev);
> > > @@ -608,8 +596,6 @@ static int virtio_mmio_remove(struct
> > > platform_device *pdev)
> > >       return 0;
> > >   }
> > >   -
> > > -
> > >   /* Devices list parameter */
> > >     #if defined(CONFIG_VIRTIO_MMIO_CMDLINE_DEVICES)
> > 
>