[PATCH 3.10 237/268] platform/x86: acer-wmi: setup accelerometer when ACPI device was found

[Willy Tarreau]

From: "Lee, Chun-Yi" <joeyli.kernel@xxxxxxxxx>

commit f9ac89f5ad613b462339e845aeb8494646fd9be2 upstream.

The 98d610c3739a patch was introduced since v4.11-rc1 that it causes
that the accelerometer input device will not be created on workable
machines because the HID string comparing logic is wrong.

And, the patch doesn't prevent that the accelerometer input device
be created on the machines that have no BST0001. That's because
the acpi_get_devices() returns success even it didn't find any
match device.

This patch fixed the HID string comparing logic of BST0001 device.
And, it also makes sure that the acpi_get_devices() returns
acpi_handle for BST0001.

Fixes: 98d610c3739a ("acer-wmi: setup accelerometer when machine has appropriate notify event")
Reference: https://bugzilla.kernel.org/show_bug.cgi?id=193761
Reported-by: Samuel Sieb <samuel-kbugs@xxxxxxxx>
Signed-off-by: "Lee, Chun-Yi" <jlee@xxxxxxxx>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Signed-off-by: Willy Tarreau <w@xxxxxx>
---
 drivers/platform/x86/acer-wmi.c | 9 ++++-----
 1 file changed, 4 insertions(+), 5 deletions(-)

diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index 9e4f870..e4d9a90 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -1870,7 +1870,7 @@ static acpi_status __init acer_wmi_get_handle_cb(acpi_handle ah, u32 level,
 	if (!strcmp(ctx, "SENR")) {
 		if (acpi_bus_get_device(ah, &dev))
 			return AE_OK;
-		if (!strcmp(ACER_WMID_ACCEL_HID, acpi_device_hid(dev)))
+		if (strcmp(ACER_WMID_ACCEL_HID, acpi_device_hid(dev)))
 			return AE_OK;
 	} else
 		return AE_OK;
@@ -1891,8 +1891,7 @@ static int __init acer_wmi_get_handle(const char *name, const char *prop,
 	handle = NULL;
 	status = acpi_get_devices(prop, acer_wmi_get_handle_cb,
 					(void *)name, &handle);
-
-	if (ACPI_SUCCESS(status)) {
+	if (ACPI_SUCCESS(status) && handle) {
 		*ah = handle;
 		return 0;
 	} else {
@@ -2276,8 +2275,8 @@ static int __init acer_wmi_init(void)
 		if (err)
 			return err;
 		err = acer_wmi_accel_setup();
-		if (err)
-			return err;
+		if (err && err != -ENODEV)
+			pr_warn("Cannot enable accelerometer\n");
 	}
 
 	err = platform_driver_register(&acer_platform_driver);
-- 
2.8.0.rc2.1.gbe9624a