linux-kernel - [PATCH AUTOSEL 5.7 043/274] platform/x86: sony-laptop: Make resuming thermal profile safer

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Message-Id: <20200608230607.3361041-43-sashal@kernel.org>
Date:   Mon,  8 Jun 2020 19:02:16 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Mattia Dongili <malattia@...ux.it>,
        Dominik Mierzejewski <dominik@...ysector.net>,
        Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
        Sasha Levin <sashal@...nel.org>,
        platform-driver-x86@...r.kernel.org
Subject: [PATCH AUTOSEL 5.7 043/274] platform/x86: sony-laptop: Make resuming thermal profile safer

From: Mattia Dongili <malattia@...ux.it>

[ Upstream commit 476d60b1b4c8a2b14a53ef9b772058f35e604661 ]

The thermal handle object may fail initialization when the module is
loaded in the first place. Avoid attempting to use it on resume then.

Fixes: 6d232b29cfce ("ACPICA: Dispatcher: always generate buffer objects for ASL create_field() operator")
Reported-by: Dominik Mierzejewski <dominik@...ysector.net>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=207491
Signed-off-by: Mattia Dongili <malattia@...ux.it>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/platform/x86/sony-laptop.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/platform/x86/sony-laptop.c b/drivers/platform/x86/sony-laptop.c
index 51309f7ceede..e4ef3dc3bc2f 100644
--- a/drivers/platform/x86/sony-laptop.c
+++ b/drivers/platform/x86/sony-laptop.c
@@ -2295,7 +2295,12 @@ static void sony_nc_thermal_cleanup(struct platform_device *pd)
 #ifdef CONFIG_PM_SLEEP
 static void sony_nc_thermal_resume(void)
 {
-	unsigned int status = sony_nc_thermal_mode_get();
+	int status;
+
+	if (!th_handle)
+		return;
+
+	status = sony_nc_thermal_mode_get();
 
 	if (status != th_handle->mode)
 		sony_nc_thermal_mode_set(th_handle->mode);
-- 
2.25.1