diff options
| author | Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com> | 2025-07-27 14:05:13 -0700 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2025-08-28 16:31:06 +0200 |
| commit | 0a61c9bcab64c7202dd60830765790e364a4b7ad (patch) | |
| tree | 97ca064d5f8026de561c4a14422f2f8416b3218a | |
| parent | 61605c847599fbfdfafe638607841c7d73719081 (diff) | |
platform/x86/intel-uncore-freq: Check write blocked for ELC
commit dff6f36878799a5ffabd15336ce993dc737374dc upstream.
Add the missing write_blocked check for updating sysfs related to uncore
efficiency latency control (ELC). If write operation is blocked return
error.
Fixes: bb516dc79c4a ("platform/x86/intel-uncore-freq: Add support for efficiency latency control")
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@linux.intel.com>
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20250727210513.2898630-1-srinivas.pandruvada@linux.intel.com
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c index 5ab45b751666..9a5ff9163988 100644 --- a/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c +++ b/drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c @@ -189,9 +189,14 @@ static int uncore_read_control_freq(struct uncore_data *data, unsigned int *valu static int write_eff_lat_ctrl(struct uncore_data *data, unsigned int val, enum uncore_index index) { struct tpmi_uncore_cluster_info *cluster_info; + struct tpmi_uncore_struct *uncore_root; u64 control; cluster_info = container_of(data, struct tpmi_uncore_cluster_info, uncore_data); + uncore_root = cluster_info->uncore_root; + + if (uncore_root->write_blocked) + return -EPERM; if (cluster_info->root_domain) return -ENODATA; |