linux-kernel - [PATCH] acer-wmi: Using zero as the first WMI instance number

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Date:   Tue, 20 Jun 2017 17:06:23 +0800
From:   "Lee, Chun-Yi" <joeyli.kernel@...il.com>
To:     Darren Hart <dvhart@...radead.org>
Cc:     platform-driver-x86@...r.kernel.org, linux-kernel@...r.kernel.org,
        "Lee, Chun-Yi" <jlee@...e.com>,
        Andy Shevchenko <andy@...radead.org>,
        Pali Rohár <pali.rohar@...il.com>
Subject: [PATCH] acer-wmi: Using zero as the first WMI instance number

Pali Rohár found that there have some wmi query/evaluation
code that they used 'one' as the first WMI instance number.
But the number is indexed from zero that it's must less than
the instance_count in _WDG.

This patch changes those instance number from one to zero.

Cc: Darren Hart <dvhart@...radead.org>
Cc: Andy Shevchenko <andy@...radead.org>
Cc: Pali Rohár <pali.rohar@...il.com> 
Signed-off-by: "Lee, Chun-Yi" <jlee@...e.com>
---
 drivers/platform/x86/acer-wmi.c | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/platform/x86/acer-wmi.c b/drivers/platform/x86/acer-wmi.c
index 79fa5ab..ef420b6 100644
--- a/drivers/platform/x86/acer-wmi.c
+++ b/drivers/platform/x86/acer-wmi.c
@@ -700,7 +700,7 @@ struct acpi_buffer *result)
 	input.length = sizeof(struct wmab_args);
 	input.pointer = (u8 *)regbuf;
 
-	status = wmi_evaluate_method(AMW0_GUID1, 1, 1, &input, result);
+	status = wmi_evaluate_method(AMW0_GUID1, 0, 1, &input, result);
 
 	return status;
 }
@@ -965,7 +965,7 @@ WMI_execute_u32(u32 method_id, u32 in, u32 *out)
 	u32 tmp = 0;
 	acpi_status status;
 
-	status = wmi_evaluate_method(WMID_GUID1, 1, method_id, &input, &result);
+	status = wmi_evaluate_method(WMID_GUID1, 0, method_id, &input, &result);
 
 	if (ACPI_FAILURE(status))
 		return status;
@@ -1275,7 +1275,7 @@ static acpi_status __init WMID_set_capabilities(void)
 	acpi_status status;
 	u32 devices;
 
-	status = wmi_query_block(WMID_GUID2, 1, &out);
+	status = wmi_query_block(WMID_GUID2, 0, &out);
 	if (ACPI_FAILURE(status))
 		return status;
 
@@ -2018,7 +2018,7 @@ static u32 get_wmid_devices(void)
 	acpi_status status;
 	u32 devices = 0;
 
-	status = wmi_query_block(WMID_GUID2, 1, &out);
+	status = wmi_query_block(WMID_GUID2, 0, &out);
 	if (ACPI_FAILURE(status))
 		return 0;
 
-- 
2.10.2