linux-kernel - [PATCH v2 2/7] ACPI: processor: idle: Mark the state as invalid when get lpi_state->arch

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Message-ID: <20251103084244.2654432-3-lihuisong@huawei.com>
Date: Mon, 3 Nov 2025 16:42:39 +0800
From: Huisong Li <lihuisong@...wei.com>
To: <rafael@...nel.org>, <lenb@...nel.org>
CC: <linux-acpi@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
	<Sudeep.Holla@....com>, <linuxarm@...wei.com>, <jonathan.cameron@...wei.com>,
	<zhanjie9@...ilicon.com>, <zhenglifeng1@...wei.com>, <yubowen8@...wei.com>,
	<lihuisong@...wei.com>
Subject: [PATCH v2 2/7] ACPI: processor: idle: Mark the state as invalid when get lpi_state->arch_flags failed

The architecture specific context loss flags is important for ARM.
And this flag is used to control the execution of different code
flows in acpi_processor_ffh_lpi_enter().

So mark the state as invalid when get lpi_state->arch_flags of this
state failed.

Fixes: a36a7fecfe60 ("ACPI / processor_idle: Add support for Low Power Idle(LPI) states")
Signed-off-by: Huisong Li <lihuisong@...wei.com>
---
 drivers/acpi/processor_idle.c | 8 ++++++--
 1 file changed, 6 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/processor_idle.c b/drivers/acpi/processor_idle.c
index 9f1040eac051..5213a545fa78 100644
--- a/drivers/acpi/processor_idle.c
+++ b/drivers/acpi/processor_idle.c
@@ -983,8 +983,12 @@ static int acpi_processor_evaluate_lpi(acpi_handle handle,
 		if (obj_get_integer(pkg_elem + 2, &lpi_state->flags))
 			lpi_state->flags = 0;
 
-		if (obj_get_integer(pkg_elem + 3, &lpi_state->arch_flags))
-			lpi_state->arch_flags = 0;
+		if (obj_get_integer(pkg_elem + 3, &lpi_state->arch_flags)) {
+			pr_err("Get state-%d architecture specific context loss flags failed, disable it.\n",
+			       state_idx);
+			lpi_state->flags = 0;
+			continue;
+		}
 
 		if (obj_get_integer(pkg_elem + 4, &lpi_state->res_cnt_freq))
 			lpi_state->res_cnt_freq = 1;
-- 
2.33.0