Unverified Commit dff6f368 authored by Srinivas Pandruvada's avatar Srinivas Pandruvada Committed by Ilpo Järvinen
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platform/x86/intel-uncore-freq: Check write blocked for ELC 



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

Fixes: bb516dc7 ("platform/x86/intel-uncore-freq: Add support for efficiency latency control")
Signed-off-by: default avatarSrinivas 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: default avatarIlpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: default avatarIlpo Järvinen <ilpo.jarvinen@linux.intel.com>
parent 5b9e0755

drivers/platform/x86/intel/uncore-frequency/uncore-frequency-tpmi.c

+5 −0
Original line number Diff line number Diff line
@@ -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;