linux-kernel - [PATCH] pinctrl: pinctrl-intel: move gpio suspend/resume to noirq phase

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <1554720566-29103-1-git-send-email-binbin.wu@intel.com>
Date:   Mon,  8 Apr 2019 18:49:26 +0800
From:   Binbin Wu <binbin.wu@...el.com>
To:     mika.westerberg@...ux.intel.com, andriy.shevchenko@...ux.intel.com,
        linux-kernel@...r.kernel.org, linux-gpio@...r.kernel.org
Cc:     binbin.wu@...el.com
Subject: [PATCH] pinctrl: pinctrl-intel: move gpio suspend/resume to noirq phase

In current driver, SET_LATE_SYSTEM_SLEEP_PM_OPS is used to install the
callbacks for suspend/resume.
GPIO pin may be used as the interrupt pin by some device. However, using
SET_LATE_SYSTEM_SLEEP_PM_OPS() to install the callbacks, the resume
callback is called after resume_device_irqs(). Unintended interrupts may
arrive due to resuming device irqs first, but the GPIO controller is not
properly restored.

Normally, for a SMP system, there are multiple cores, so even when there are
unintended interrupts, BSP gets the chance to init the gpio chip soon.
But when there is only 1 core is active (other cores are offlined or
single core) during resume, it is more easily to observe the unintended
interrupts.

This patch renames the suspend/resume function by adding suffix "_noirq",
and installs the callbacks using SET_NOIRQ_SYSTEM_SLEEP_PM_OPS().

Signed-off-by: Binbin Wu <binbin.wu@...el.com>
---
 drivers/pinctrl/intel/pinctrl-intel.c |  8 ++++----
 drivers/pinctrl/intel/pinctrl-intel.h | 11 ++++++-----
 2 files changed, 10 insertions(+), 9 deletions(-)

diff --git a/drivers/pinctrl/intel/pinctrl-intel.c b/drivers/pinctrl/intel/pinctrl-intel.c
index 3b18181..70638b7 100644
--- a/drivers/pinctrl/intel/pinctrl-intel.c
+++ b/drivers/pinctrl/intel/pinctrl-intel.c
@@ -1466,7 +1466,7 @@ static bool intel_pinctrl_should_save(struct intel_pinctrl *pctrl, unsigned int
 	return false;
 }
 
-int intel_pinctrl_suspend(struct device *dev)
+int intel_pinctrl_suspend_noirq(struct device *dev)
 {
 	struct intel_pinctrl *pctrl = dev_get_drvdata(dev);
 	struct intel_community_context *communities;
@@ -1505,7 +1505,7 @@ int intel_pinctrl_suspend(struct device *dev)
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(intel_pinctrl_suspend);
+EXPORT_SYMBOL_GPL(intel_pinctrl_suspend_noirq);
 
 static void intel_gpio_irq_init(struct intel_pinctrl *pctrl)
 {
@@ -1527,7 +1527,7 @@ static void intel_gpio_irq_init(struct intel_pinctrl *pctrl)
 	}
 }
 
-int intel_pinctrl_resume(struct device *dev)
+int intel_pinctrl_resume_noirq(struct device *dev)
 {
 	struct intel_pinctrl *pctrl = dev_get_drvdata(dev);
 	const struct intel_community_context *communities;
@@ -1589,7 +1589,7 @@ int intel_pinctrl_resume(struct device *dev)
 
 	return 0;
 }
-EXPORT_SYMBOL_GPL(intel_pinctrl_resume);
+EXPORT_SYMBOL_GPL(intel_pinctrl_resume_noirq);
 #endif
 
 MODULE_AUTHOR("Mathias Nyman <mathias.nyman@...ux.intel.com>");
diff --git a/drivers/pinctrl/intel/pinctrl-intel.h b/drivers/pinctrl/intel/pinctrl-intel.h
index b8a07d37..a8e958f 100644
--- a/drivers/pinctrl/intel/pinctrl-intel.h
+++ b/drivers/pinctrl/intel/pinctrl-intel.h
@@ -177,13 +177,14 @@ int intel_pinctrl_probe_by_hid(struct platform_device *pdev);
 int intel_pinctrl_probe_by_uid(struct platform_device *pdev);
 
 #ifdef CONFIG_PM_SLEEP
-int intel_pinctrl_suspend(struct device *dev);
-int intel_pinctrl_resume(struct device *dev);
+int intel_pinctrl_suspend_noirq(struct device *dev);
+int intel_pinctrl_resume_noirq(struct device *dev);
 #endif
 
-#define INTEL_PINCTRL_PM_OPS(_name)						  \
-const struct dev_pm_ops _name = {						  \
-	SET_LATE_SYSTEM_SLEEP_PM_OPS(intel_pinctrl_suspend, intel_pinctrl_resume) \
+#define INTEL_PINCTRL_PM_OPS(_name)					\
+const struct dev_pm_ops _name = {					\
+	SET_NOIRQ_SYSTEM_SLEEP_PM_OPS(intel_pinctrl_suspend_noirq,	\
+				      intel_pinctrl_resume_noirq)	\
 }
 
 #endif /* PINCTRL_INTEL_H */
-- 
2.7.4