The patch below does not apply to the 5.10-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From aefbe5c445c7e2f0e082b086ba1e45502dac4b0e Mon Sep 17 00:00:00 2001
From: Matt Chen <matt.chen@xxxxxxxxx>
Date: Fri, 22 Jan 2021 14:52:36 +0200
Subject: [PATCH] iwlwifi: mvm: fix the return type for DSM functions 1 and 2
The return type value of functions 1 and 2 were considered to be an
integer inside a buffer, but they can also be only an integer, without
the buffer. Fix the code in iwl_acpi_get_dsm_u8() to handle it as a
single integer value, as well as packed inside a buffer.
Signed-off-by: Matt Chen <matt.chen@xxxxxxxxx>
Fixes: 9db93491f29e ("iwlwifi: acpi: support device specific method (DSM)")
Signed-off-by: Luca Coelho <luciano.coelho@xxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/iwlwifi.20210122144849.5757092adcd6.Ic24524627b899c9a01af38107a62a626bdf5ae3a@changeid
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/acpi.c b/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
index 15248b064380..d8b7776a8dde 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
+++ b/drivers/net/wireless/intel/iwlwifi/fw/acpi.c
@@ -80,19 +80,45 @@ static void *iwl_acpi_get_dsm_object(struct device *dev, int rev, int func,
}
/*
- * Evaluate a DSM with no arguments and a single u8 return value (inside a
- * buffer object), verify and return that value.
+ * Generic function to evaluate a DSM with no arguments
+ * and an integer return value,
+ * (as an integer object or inside a buffer object),
+ * verify and assign the value in the "value" parameter.
+ * return 0 in success and the appropriate errno otherwise.
*/
-int iwl_acpi_get_dsm_u8(struct device *dev, int rev, int func)
+static int iwl_acpi_get_dsm_integer(struct device *dev, int rev, int func,
+ u64 *value, size_t expected_size)
{
union acpi_object *obj;
- int ret;
+ int ret = 0;
obj = iwl_acpi_get_dsm_object(dev, rev, func, NULL);
- if (IS_ERR(obj))
+ if (IS_ERR(obj)) {
+ IWL_DEBUG_DEV_RADIO(dev,
+ "Failed to get DSM object. func= %d\n",
+ func);
return -ENOENT;
+ }
+
+ if (obj->type == ACPI_TYPE_INTEGER) {
+ *value = obj->integer.value;
+ } else if (obj->type == ACPI_TYPE_BUFFER) {
+ __le64 le_value = 0;
- if (obj->type != ACPI_TYPE_BUFFER) {
+ if (WARN_ON_ONCE(expected_size > sizeof(le_value)))
+ return -EINVAL;
+
+ /* if the buffer size doesn't match the expected size */
+ if (obj->buffer.length != expected_size)
+ IWL_DEBUG_DEV_RADIO(dev,
+ "ACPI: DSM invalid buffer size, padding or truncating (%d)\n",
+ obj->buffer.length);
+
+ /* assuming LE from Intel BIOS spec */
+ memcpy(&le_value, obj->buffer.pointer,
+ min_t(size_t, expected_size, (size_t)obj->buffer.length));
+ *value = le64_to_cpu(le_value);
+ } else {
IWL_DEBUG_DEV_RADIO(dev,
"ACPI: DSM method did not return a valid object, type=%d\n",
obj->type);
@@ -100,15 +126,6 @@ int iwl_acpi_get_dsm_u8(struct device *dev, int rev, int func)
goto out;
}
- if (obj->buffer.length != sizeof(u8)) {
- IWL_DEBUG_DEV_RADIO(dev,
- "ACPI: DSM method returned invalid buffer, length=%d\n",
- obj->buffer.length);
- ret = -EINVAL;
- goto out;
- }
-
- ret = obj->buffer.pointer[0];
IWL_DEBUG_DEV_RADIO(dev,
"ACPI: DSM method evaluated: func=%d, ret=%d\n",
func, ret);
@@ -116,6 +133,24 @@ int iwl_acpi_get_dsm_u8(struct device *dev, int rev, int func)
ACPI_FREE(obj);
return ret;
}
+
+/*
+ * Evaluate a DSM with no arguments and a u8 return value,
+ */
+int iwl_acpi_get_dsm_u8(struct device *dev, int rev, int func, u8 *value)
+{
+ int ret;
+ u64 val;
+
+ ret = iwl_acpi_get_dsm_integer(dev, rev, func, &val, sizeof(u8));
+
+ if (ret < 0)
+ return ret;
+
+ /* cast val (u64) to be u8 */
+ *value = (u8)val;
+ return 0;
+}
IWL_EXPORT_SYMBOL(iwl_acpi_get_dsm_u8);
union acpi_object *iwl_acpi_get_wifi_pkg(struct device *dev,
diff --git a/drivers/net/wireless/intel/iwlwifi/fw/acpi.h b/drivers/net/wireless/intel/iwlwifi/fw/acpi.h
index 042dd247d387..1cce30d1ef55 100644
--- a/drivers/net/wireless/intel/iwlwifi/fw/acpi.h
+++ b/drivers/net/wireless/intel/iwlwifi/fw/acpi.h
@@ -1,7 +1,7 @@
/* SPDX-License-Identifier: GPL-2.0 OR BSD-3-Clause */
/*
* Copyright (C) 2017 Intel Deutschland GmbH
- * Copyright (C) 2018-2020 Intel Corporation
+ * Copyright (C) 2018-2021 Intel Corporation
*/
#ifndef __iwl_fw_acpi__
#define __iwl_fw_acpi__
@@ -99,7 +99,7 @@ struct iwl_fw_runtime;
void *iwl_acpi_get_object(struct device *dev, acpi_string method);
-int iwl_acpi_get_dsm_u8(struct device *dev, int rev, int func);
+int iwl_acpi_get_dsm_u8(struct device *dev, int rev, int func, u8 *value);
union acpi_object *iwl_acpi_get_wifi_pkg(struct device *dev,
union acpi_object *data,
@@ -159,7 +159,8 @@ static inline void *iwl_acpi_get_dsm_object(struct device *dev, int rev,
return ERR_PTR(-ENOENT);
}
-static inline int iwl_acpi_get_dsm_u8(struct device *dev, int rev, int func)
+static inline
+int iwl_acpi_get_dsm_u8(struct device *dev, int rev, int func, u8 *value)
{
return -ENOENT;
}
diff --git a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
index 0637eb1cff4e..313e9f106f46 100644
--- a/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
+++ b/drivers/net/wireless/intel/iwlwifi/mvm/fw.c
@@ -1090,20 +1090,22 @@ static void iwl_mvm_tas_init(struct iwl_mvm *mvm)
static u8 iwl_mvm_eval_dsm_indonesia_5g2(struct iwl_mvm *mvm)
{
+ u8 value;
+
int ret = iwl_acpi_get_dsm_u8((&mvm->fwrt)->dev, 0,
- DSM_FUNC_ENABLE_INDONESIA_5G2);
+ DSM_FUNC_ENABLE_INDONESIA_5G2, &value);
if (ret < 0)
IWL_DEBUG_RADIO(mvm,
"Failed to evaluate DSM function ENABLE_INDONESIA_5G2, ret=%d\n",
ret);
- else if (ret >= DSM_VALUE_INDONESIA_MAX)
+ else if (value >= DSM_VALUE_INDONESIA_MAX)
IWL_DEBUG_RADIO(mvm,
- "DSM function ENABLE_INDONESIA_5G2 return invalid value, ret=%d\n",
- ret);
+ "DSM function ENABLE_INDONESIA_5G2 return invalid value, value=%d\n",
+ value);
- else if (ret == DSM_VALUE_INDONESIA_ENABLE) {
+ else if (value == DSM_VALUE_INDONESIA_ENABLE) {
IWL_DEBUG_RADIO(mvm,
"Evaluated DSM function ENABLE_INDONESIA_5G2: Enabling 5g2\n");
return DSM_VALUE_INDONESIA_ENABLE;
@@ -1114,25 +1116,26 @@ static u8 iwl_mvm_eval_dsm_indonesia_5g2(struct iwl_mvm *mvm)
static u8 iwl_mvm_eval_dsm_disable_srd(struct iwl_mvm *mvm)
{
+ u8 value;
int ret = iwl_acpi_get_dsm_u8((&mvm->fwrt)->dev, 0,
- DSM_FUNC_DISABLE_SRD);
+ DSM_FUNC_DISABLE_SRD, &value);
if (ret < 0)
IWL_DEBUG_RADIO(mvm,
"Failed to evaluate DSM function DISABLE_SRD, ret=%d\n",
ret);
- else if (ret >= DSM_VALUE_SRD_MAX)
+ else if (value >= DSM_VALUE_SRD_MAX)
IWL_DEBUG_RADIO(mvm,
- "DSM function DISABLE_SRD return invalid value, ret=%d\n",
- ret);
+ "DSM function DISABLE_SRD return invalid value, value=%d\n",
+ value);
- else if (ret == DSM_VALUE_SRD_PASSIVE) {
+ else if (value == DSM_VALUE_SRD_PASSIVE) {
IWL_DEBUG_RADIO(mvm,
"Evaluated DSM function DISABLE_SRD: setting SRD to passive\n");
return DSM_VALUE_SRD_PASSIVE;
- } else if (ret == DSM_VALUE_SRD_DISABLE) {
+ } else if (value == DSM_VALUE_SRD_DISABLE) {
IWL_DEBUG_RADIO(mvm,
"Evaluated DSM function DISABLE_SRD: disabling SRD\n");
return DSM_VALUE_SRD_DISABLE;
