Re: [PATCH 3/4] fs/resctrl: Fix deadlock for errors during mount

[Chen, Yu C]

On 5/12/2026 6:53 AM, Reinette Chatre wrote:
> Hi Tony,
>
> On 5/8/26 11:21 AM, Tony Luck wrote:

> +	 * Obtain reference with locks held to protect against interference
> +	 * from resctrl_exit().
> +	*/
> +	kernfs_get(rdt_root_kn);

[ ... ]

> @@ -3130,6 +3144,7 @@ static int rdt_get_tree(struct fs_context *fc)
>   	 */
>   	if (!ctx->kfc.new_sb_created)
>   		resctrl_unmount();
> +	kernfs_put(rdt_root_kn);

I wonder if above should be protected against
	cpus_read_lock();
	mutex_lock(&rdtgroup_mutex);
like kernfs_get()?

thanks,
Chenyu