linux-kernel - [PATCH] ACPI: Run fixed button devices' notify callback in the process context

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Date:	Fri, 22 Aug 2014 15:37:55 +0800
From:	Lan Tianyu <tianyu.lan@...el.com>
To:	rjw@...ysocki.net, lenb@...nel.org, bebl@...eta.org,
	davem@...emloft.net
Cc:	Lan Tianyu <tianyu.lan@...el.com>, linux-acpi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [PATCH] ACPI: Run fixed button devices' notify callback in the process context

Currently fixed button devices' notify callbacks are running in the
interrupt context. It's not necessary and prevent calling functions
with mutex lock(E,G evaluating ACPI method). Otherwise, it's different
with non-fixed button device whose notify callback is running in the process
context. This patch is to make fixed button device's notify
callback in the process context and this also can avoid dead lock
when using netlink to report button event to user space.

Signed-off-by: Lan Tianyu <tianyu.lan@...el.com>
---
 drivers/acpi/scan.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 0a817ad..bfb7fc5 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -922,12 +922,17 @@ static void acpi_device_notify(acpi_handle handle, u32 event, void *data)
 	device->driver->ops.notify(device, event);
 }
 
-static acpi_status acpi_device_notify_fixed(void *data)
+static void acpi_device_notify_fixed_run(void *data)
 {
 	struct acpi_device *device = data;
 
-	/* Fixed hardware devices have no handles */
 	acpi_device_notify(NULL, ACPI_FIXED_HARDWARE_EVENT, device);
+}
+
+static acpi_status acpi_device_notify_fixed(void *data)
+{
+	/* Fixed hardware devices have no handles */
+	acpi_os_execute(OSL_NOTIFY_HANDLER, acpi_device_notify_fixed_run, data);
 	return AE_OK;
 }
 
-- 
1.8.3.1

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