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Guixiong Wei
b10a696411
commit6b63520ed1upstream. When the last CPU of a legacy uncore die goes offline, uncore_freq_remove_die_entry() clears control_cpu. During CPU hotplug re-add, uncore_freq_add_entry() still populates sysfs attributes before assigning the new control CPU. As a result, the current frequency read returns -ENXIO and current_freq_khz is omitted from the recreated sysfs group. Assign control_cpu before the initial read paths and before create_attr_group() so sysfs recreation uses the new online CPU. If sysfs creation fails, restore control_cpu to -1 to keep the error path state consistent. Fixes:4d73c6772a("platform/x86: intel-uncore-freq: Conditionally create attribute for read frequency") Cc: stable@vger.kernel.org Acked-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> Link: https://patch.msgid.link/20260602020752.3126-1-weiguixiong@bytedance.com Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> [weiguixiong: Adapt to legacy uncore_read() and instance_id naming.] Signed-off-by: Guixiong Wei <weiguixiong@bytedance.com> Signed-off-by: Sasha Levin <sashal@kernel.org>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.