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platform/x86/intel-uncore-freq: Check write blocked for ELC

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Add the missing write_blocked check for updating sysfs related to uncore
efficiency latency control (ELC). If write operation is blocked return
error.

Fixes: bb516dc79c ("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>
This commit is contained in:
Srinivas Pandruvada
2025-07-27 14:05:13 -07:00
committed by Ilpo Järvinen
parent 5b9e07551f
commit dff6f36878
1 changed files with 5 additions and 0 deletions
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5
drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c
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@@ -192,9 +192,14 @@ 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;