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From: "Rafael J. Wysocki" <rjw@rjwysocki.net>
To: Linux PM <linux-pm@vger.kernel.org>
Cc: Marek Szyprowski <m.szyprowski@samsung.com>,
	Linux ACPI <linux-acpi@vger.kernel.org>,
	LKML <linux-kernel@vger.kernel.org>,
	Zhang Rui <rui.zhang@intel.com>,
	Rajneesh Bhardwaj <rajneesh.bhardwaj@linux.intel.com>,
	Andy Shevchenko <andriy.shevchenko@linux.intel.com>,
	Mario Limonciello <mario.limonciello@dell.com>,
	Kai-Heng Feng <kai.heng.feng@canonical.com>
Subject: [PATCH] PM: suspend: Fix platform_suspend_prepare_noirq()
Date: Sat, 10 Aug 2019 13:24:04 +0200	[thread overview]
Message-ID: <1929036.rkDPr3nAr5@kreacher> (raw)
In-Reply-To: <1b181f35-29c3-c6ce-6c42-ae55e890579e@samsung.com>

From: Rafael J. Wysocki <rafael.j.wysocki@intel.com>

After commit ac9eafbe930a ("ACPI: PM: s2idle: Execute LPS0 _DSM
functions with suspended devices"), a NULL pointer may be dereferenced
if suspend-to-idle is attempted on a platform without "traditional"
suspend support due to invalid fall-through in
platform_suspend_prepare_noirq().

Fix that and while at it add missing braces in platform_resume_noirq().

Fixes: ac9eafbe930a ("ACPI: PM: s2idle: Execute LPS0 _DSM functions with suspended devices")
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

Commit ac9eafbe930a is in linux-next only at this point.

---
 kernel/power/suspend.c |   11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

Index: linux-pm/kernel/power/suspend.c
===================================================================
--- linux-pm.orig/kernel/power/suspend.c
+++ linux-pm/kernel/power/suspend.c
@@ -253,10 +253,10 @@ static int platform_suspend_prepare_late
 
 static int platform_suspend_prepare_noirq(suspend_state_t state)
 {
-	if (state == PM_SUSPEND_TO_IDLE) {
-		if (s2idle_ops && s2idle_ops->prepare_late)
-			return s2idle_ops->prepare_late();
-	}
+	if (state == PM_SUSPEND_TO_IDLE)
+		return s2idle_ops && s2idle_ops->prepare_late ?
+			s2idle_ops->prepare_late() : 0;
+
 	return suspend_ops->prepare_late ? suspend_ops->prepare_late() : 0;
 }
 
@@ -265,8 +265,9 @@ static void platform_resume_noirq(suspen
 	if (state == PM_SUSPEND_TO_IDLE) {
 		if (s2idle_ops && s2idle_ops->restore_early)
 			s2idle_ops->restore_early();
-	} else if (suspend_ops->wake)
+	} else if (suspend_ops->wake) {
 		suspend_ops->wake();
+	}
 }
 
 static void platform_resume_early(suspend_state_t state)




  parent reply	other threads:[~2019-08-10 11:24 UTC|newest]

Thread overview: 25+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-02 10:33 [PATCH v3 0/8] PM / ACPI: sleep: Additional changes related to suspend-to-idle Rafael J. Wysocki
2019-08-02 10:38 ` [PATCH v3 1/8] ACPI: PM: Set up EC GPE for system wakeup from drivers that need it Rafael J. Wysocki
2019-08-02 10:38 ` [PATCH v3 2/8] ACPI: PM: s2idle: Rearrange lps0_device_attach() Rafael J. Wysocki
2019-08-02 10:38 ` [PATCH v3 3/8] ACPI: PM: s2idle: Add acpi.sleep_no_lps0 module parameter Rafael J. Wysocki
2019-08-02 10:40 ` [PATCH v3 4/8] ACPI: PM: s2idle: Switch EC over to polling during "noirq" suspend Rafael J. Wysocki
2019-08-02 10:41 ` [PATCH v3 5/8] ACPI: PM: s2idle: Eliminate acpi_sleep_no_ec_events() Rafael J. Wysocki
2019-08-02 10:43 ` [PATCH v3 6/8] ACPI: EC: PM: Consolidate some code depending on PM_SLEEP Rafael J. Wysocki
2019-08-02 10:44 ` [PATCH v3 7/8] ACPI: EC: PM: Make acpi_ec_dispatch_gpe() print debug message Rafael J. Wysocki
2019-08-02 10:45 ` [PATCH v3 8/8] ACPI: PM: s2idle: Execute LPS0 _DSM functions with suspended devices Rafael J. Wysocki
     [not found]   ` <CGME20190809120052eucas1p11b56806662ef4f4efb82a152ad651481@eucas1p1.samsung.com>
2019-08-09 12:00     ` Marek Szyprowski
2019-08-09 12:15       ` Rafael J. Wysocki
2019-08-10 11:24       ` Rafael J. Wysocki [this message]
2019-08-05 16:25 ` [PATCH v3 0/8] PM / ACPI: sleep: Additional changes related to suspend-to-idle Kai-Heng Feng
2019-08-12 13:55 ` Bhardwaj, Rajneesh
2019-08-12 21:32   ` Rafael J. Wysocki
2019-08-16 20:20 ` Kristian Klausen
2019-08-19  7:59   ` Rafael J. Wysocki
2019-08-19  9:05     ` Rafael J. Wysocki
2019-08-19 15:45       ` Kristian Klausen
2019-08-19 20:41         ` Rafael J. Wysocki
2019-08-20 13:10           ` Kristian Klausen
2019-08-20 13:29             ` Rafael J. Wysocki
2019-08-20 21:38               ` Rafael J. Wysocki
2019-08-20 22:47                 ` Kristian Klausen
2019-08-21  7:30                   ` Rafael J. Wysocki

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