2 files changed, 17 insertions, 5 deletions

diff --git a/drivers/acpi/video_detect.c b/drivers/acpi/video_detect.c
index 815f75ef2411..2922f1f252d5 100644
--- a/drivers/acpi/video_detect.c
+++ b/drivers/acpi/video_detect.c
@@ -32,6 +32,7 @@
 #include <linux/module.h>
 #include <linux/pci.h>
 #include <linux/types.h>
+#include <linux/workqueue.h>
 #include <acpi/video.h>
 
 ACPI_MODULE_NAME("video");
@@ -41,6 +42,7 @@ void acpi_video_unregister_backlight(void);
 
 static bool backlight_notifier_registered;
 static struct notifier_block backlight_nb;
+static struct work_struct backlight_notify_work;
 
 static enum acpi_backlight_type acpi_backlight_cmdline = acpi_backlight_undef;
 static enum acpi_backlight_type acpi_backlight_dmi = acpi_backlight_undef;
@@ -262,6 +264,13 @@ static const struct dmi_system_id video_detect_dmi_table[] = {
         { },
 };
 
+/* This uses a workqueue to avoid various locking ordering issues */
+static void acpi_video_backlight_notify_work(struct work_struct *work)
+{
+        if (acpi_video_get_backlight_type() != acpi_backlight_video)
+                acpi_video_unregister_backlight();
+}
+
 static int acpi_video_backlight_notify(struct notifier_block *nb,
                                        unsigned long val, void *bd)
 {
@@ -269,9 +278,8 @@ static int acpi_video_backlight_notify(struct notifier_block *nb,
 
         /* A raw bl registering may change video -> native */
         if (backlight->props.type == BACKLIGHT_RAW &&
-            val == BACKLIGHT_REGISTERED &&
-            acpi_video_get_backlight_type() != acpi_backlight_video)
-                acpi_video_unregister_backlight();
+            val == BACKLIGHT_REGISTERED)
+                schedule_work(&backlight_notify_work);
 
         return NOTIFY_OK;
 }
@@ -304,6 +312,8 @@ enum acpi_backlight_type acpi_video_get_backlight_type(void)
                 acpi_walk_namespace(ACPI_TYPE_DEVICE, ACPI_ROOT_OBJECT,
                                     ACPI_UINT32_MAX, find_video, NULL,
                                     &video_caps, NULL);
+                INIT_WORK(&backlight_notify_work,
+                          acpi_video_backlight_notify_work);
                 backlight_nb.notifier_call = acpi_video_backlight_notify;
                 backlight_nb.priority = 0;
                 if (backlight_register_notifier(&backlight_nb) == 0)
diff --git a/drivers/cpufreq/exynos-cpufreq.c b/drivers/cpufreq/exynos-cpufreq.c
index ae5b2bd3a978..fa3dd840a837 100644
--- a/drivers/cpufreq/exynos-cpufreq.c
+++ b/drivers/cpufreq/exynos-cpufreq.c
@@ -180,7 +180,7 @@ static int exynos_cpufreq_probe(struct platform_device *pdev)
                 ret = exynos5250_cpufreq_init(exynos_info);
         } else {
                 pr_err("%s: Unknown SoC type\n", __func__);
-                return -ENODEV;
+                ret = -ENODEV;
         }
 
         if (ret)
@@ -188,12 +188,14 @@ static int exynos_cpufreq_probe(struct platform_device *pdev)
 
         if (exynos_info->set_freq == NULL) {
                 dev_err(&pdev->dev, "No set_freq function (ERR)\n");
+                ret = -EINVAL;
                 goto err_vdd_arm;
         }
 
         arm_regulator = regulator_get(NULL, "vdd_arm");
         if (IS_ERR(arm_regulator)) {
                 dev_err(&pdev->dev, "failed to get resource vdd_arm\n");
+                ret = -EINVAL;
                 goto err_vdd_arm;
         }
 
@@ -225,7 +227,7 @@ err_cpufreq_reg:
         regulator_put(arm_regulator);
 err_vdd_arm:
         kfree(exynos_info);
-        return -EINVAL;
+        return ret;
 }
 
 static struct platform_driver exynos_cpufreq_platdrv = {