Re: [RFC PATCH rdma-next] RDMA/srp: Don't cache device name as part of sysfs name

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On 5/15/19 11:50 AM, Leon Romanovsky wrote:
> @@ -4089,11 +4093,15 @@ static struct srp_host *srp_add_port(struct srp_device *device, u8 port)
> 
>  	host->dev.class = &srp_class;
>  	host->dev.parent = device->dev->dev.parent;
> -	dev_set_name(&host->dev, "srp-%s-%d", dev_name(&device->dev->dev),
> -		     port);
> +	devnum = find_first_zero_bit(dev_map, SRP_MAX_DEVICES);
> +	if (devnum >= SRP_MAX_DEVICES)
> +		goto free_host;
> +	set_bit(devnum, dev_map);
> +	host->devnum = devnum;
> +	dev_set_name(&host->dev, "srp%d", devnum);
> 
>  	if (device_register(&host->dev))
> -		goto free_host;
> +		goto free_num;
>  	if (device_create_file(&host->dev, &dev_attr_add_target))
>  		goto err_class;
>  	if (device_create_file(&host->dev, &dev_attr_ibdev))

Hi Leon,

Thank you for having root-caused this issue. However, this patch
modifies the ABI between kernel and user space and hence breaks at least
srp_daemon and blktests. Are you aware it is considered completely
unacceptable in the Linux community to break user space? You may have
noticed that the SRP sysfs ABI has been documented in
Documentation/ABI/stable/sysfs-driver-ib_srp.

Bart.





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