linux-kernel - [PATCH 1/2] platform/x86: ISST: Add missing write block check

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Message-ID: <20251229183450.823244-2-srinivas.pandruvada@linux.intel.com>
Date: Mon, 29 Dec 2025 10:34:49 -0800
From: Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>
To: hansg@...nel.org,
	ilpo.jarvinen@...ux.intel.com
Cc: platform-driver-x86@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
	stable@...r.kernel.org
Subject: [PATCH 1/2] platform/x86: ISST: Add missing write block check

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@...ux.intel.com>
Cc: <stable@...r.kernel.org>
---
 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 34bff2f65a83..f587709ddd47 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,
-- 
2.52.0