linux-kernel - Re: [PATCH 4/5] soundwire: sysfs: remove sdw_slave_sysfs

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Date:   Fri, 29 Jul 2022 10:00:42 -0500
From:   Pierre-Louis Bossart <pierre-louis.bossart@...ux.intel.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        alsa-devel@...a-project.org
Cc:     Vinod Koul <vkoul@...nel.org>,
        Bard Liao <yung-chuan.liao@...ux.intel.com>,
        Sanyog Kale <sanyog.r.kale@...el.com>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 4/5] soundwire: sysfs: remove sdw_slave_sysfs_init()



> diff --git a/drivers/soundwire/sysfs_slave_dpn.c b/drivers/soundwire/sysfs_slave_dpn.c
> index c4b6543c09fd..a3fb380ee519 100644
> --- a/drivers/soundwire/sysfs_slave_dpn.c
> +++ b/drivers/soundwire/sysfs_slave_dpn.c
> @@ -283,6 +283,9 @@ int sdw_slave_sysfs_dpn_init(struct sdw_slave *slave)
>  	int ret;
>  	int i;
>  
> +	if (!slave->prop.source_ports && !slave->prop.sink_ports)
> +		return 0;
> +
>  	mask = slave->prop.source_ports;
>  	for_each_set_bit(i, &mask, 32) {
>  		ret = add_all_attributes(&slave->dev, i, 1);

I am struggling with this one since the driver is still adding
attributes manually. You mentioned in the other thread that

"
That's what the is_visible() callback is for in the groups structure,
you determine if the attribute is visable or not at runtime, you don't
rely on the driver itself to add/remove attributes, that does not scale
and again, is racy.
"

I interpret that as "there's still a race here", no?