[PATCH 6.19 598/844] platform/x86: ISST: Add missing write block check

[Sasha Levin]

From: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>

[ Upstream commit 0e5aef2795008c80c515f6fa04e377c6e5715958 ]

If writes are blocked, then return error during SST-CP enable command.
Add missing write block check in this code path.

Fixes: 8bed9ff7dbcc ("platform/x86: ISST: Process read/write blocked feature status")
Signed-off-by: Srinivas Pandruvada <srinivas.pandruvada@xxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Link: https://patch.msgid.link/20260107060256.1634188-2-srinivas.pandruvada@xxxxxxxxxxxxxxx
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c b/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c
index 34bff2f65a835..f587709ddd473 100644
--- a/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c
+++ b/drivers/platform/x86/intel/speed_select_if/isst_tpmi_core.c
@@ -612,6 +612,9 @@ static long isst_if_core_power_state(void __user *argp)
 		return -EINVAL;
 
 	if (core_power.get_set) {
+		if (power_domain_info->write_blocked)
+			return -EPERM;
+
 		_write_cp_info("cp_enable", core_power.enable, SST_CP_CONTROL_OFFSET,
 			       SST_CP_ENABLE_START, SST_CP_ENABLE_WIDTH, SST_MUL_FACTOR_NONE)
 		_write_cp_info("cp_prio_type", core_power.priority_type, SST_CP_CONTROL_OFFSET,
-- 
2.51.0