linux-kernel - Re: [PATCH] remoteproc: core: Auto select rproc-virtio device id

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Date:   Thu, 13 Oct 2022 10:27:38 +0200
From:   Arnaud POULIQUEN <arnaud.pouliquen@...s.st.com>
To:     Shengjiu Wang <shengjiu.wang@....com>, <andersson@...nel.org>,
        <mathieu.poirier@...aro.org>
CC:     <linux-remoteproc@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <shengjiu.wang@...il.com>
Subject: Re: [PATCH] remoteproc: core: Auto select rproc-virtio device id

Hi Shengju,

On 10/13/22 04:28, Shengjiu Wang wrote:
> With multiple remoteproc device, there will below error:
> 
> sysfs: cannot create duplicate filename '/bus/platform/devices/rproc-virtio.0'

Good catch! 
Previously the device created was 
/sys/class/remoteproc/remoteproc0/remoteproc0#vdev0buffer/

So with your fix it become something like 
/bus/platform/devices/rproc-virtio.2.auto


This works fine on my platform, also when creating two virtio devices for one
remoteproc device.
 
Just a remark, could be nice to indicate in the commit message the result of
your patch, means the name of the files created.

With that:
Reviewed-by: Arnaud Pouliquen <arnaud.pouliquen@...s.st.com>

Thanks,
Arnaud


> 
> The rvdev_data.index is duplicate, that cause issue, so
> need to use the PLATFORM_DEVID_AUTO instead.
> 
> Fixes: 1d7b61c06dc3 ("remoteproc: virtio: Create platform device for the remoteproc_virtio")
> Signed-off-by: Shengjiu Wang <shengjiu.wang@....com>
> ---
>  drivers/remoteproc/remoteproc_core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/remoteproc/remoteproc_core.c b/drivers/remoteproc/remoteproc_core.c
> index 8768cb64f560..03a26498e879 100644
> --- a/drivers/remoteproc/remoteproc_core.c
> +++ b/drivers/remoteproc/remoteproc_core.c
> @@ -509,7 +509,7 @@ static int rproc_handle_vdev(struct rproc *rproc, void *ptr,
>  	rvdev_data.rsc_offset = offset;
>  	rvdev_data.rsc = rsc;
>  
> -	pdev = platform_device_register_data(dev, "rproc-virtio", rvdev_data.index, &rvdev_data,
> +	pdev = platform_device_register_data(dev, "rproc-virtio", PLATFORM_DEVID_AUTO, &rvdev_data,
>  					     sizeof(rvdev_data));
>  	if (IS_ERR(pdev)) {
>  		dev_err(dev, "failed to create rproc-virtio device\n");