[PATCH v2 2/3] platform/x86: dell-smbios: Pass device to callbacks

[Armin Wolf <W_Armin@gmx.de>]

The WMI SMBIOS backend needs to access the its driver state container
when performing SMBIOS calls. Pass the device associated with a given
backend to the callback function to allow the WMI backend to retrieve
said state container in a more straightforward manner.

Signed-off-by: Armin Wolf <W_Armin@gmx.de>
---
 drivers/platform/x86/dell/dell-smbios-base.c |  6 +++---
 drivers/platform/x86/dell/dell-smbios-smm.c  |  8 ++++----
 drivers/platform/x86/dell/dell-smbios-wmi.c  | 10 ++--------
 drivers/platform/x86/dell/dell-smbios.h      |  4 +++-
 4 files changed, 12 insertions(+), 16 deletions(-)

diff --git a/drivers/platform/x86/dell/dell-smbios-base.c b/drivers/platform/x86/dell/dell-smbios-base.c
index 4b7c54b76228..d8c55ec6acd4 100644
--- a/drivers/platform/x86/dell/dell-smbios-base.c
+++ b/drivers/platform/x86/dell/dell-smbios-base.c
@@ -40,7 +40,7 @@ struct smbios_device {
 	struct list_head list;
 	struct device *device;
 	int priority;
-	int (*call_fn)(struct calling_interface_buffer *arg);
+	smbios_callback_fn_t call_fn;
 };
 
 struct smbios_call {
@@ -146,7 +146,7 @@ int dell_smbios_error(int value)
 }
 EXPORT_SYMBOL_GPL(dell_smbios_error);
 
-int dell_smbios_register_device(struct device *d, int priority, void *call_fn)
+int dell_smbios_register_device(struct device *d, int priority, smbios_callback_fn_t call_fn)
 {
 	struct smbios_device *priv;
 
@@ -312,7 +312,7 @@ int dell_smbios_call(struct calling_interface_buffer *buffer)
 		goto out_smbios_call;
 	}
 
-	ret = selected->call_fn(buffer);
+	ret = selected->call_fn(selected->device, buffer);
 
 out_smbios_call:
 	mutex_unlock(&smbios_mutex);
diff --git a/drivers/platform/x86/dell/dell-smbios-smm.c b/drivers/platform/x86/dell/dell-smbios-smm.c
index 7055e2c40f34..fc4a674c692e 100644
--- a/drivers/platform/x86/dell/dell-smbios-smm.c
+++ b/drivers/platform/x86/dell/dell-smbios-smm.c
@@ -49,7 +49,7 @@ static void find_cmd_address(const struct dmi_header *dm, void *dummy)
 	}
 }
 
-static int dell_smbios_smm_call(struct calling_interface_buffer *input)
+static int dell_smbios_smm_call(struct device *dev, struct calling_interface_buffer *input)
 {
 	struct smi_cmd command;
 	size_t size;
@@ -70,7 +70,7 @@ static int dell_smbios_smm_call(struct calling_interface_buffer *input)
 }
 
 /* When enabled this indicates that SMM won't work */
-static bool test_wsmt_enabled(void)
+static bool test_wsmt_enabled(struct device *dev)
 {
 	struct calling_interface_token *wsmt;
 
@@ -88,7 +88,7 @@ static bool test_wsmt_enabled(void)
 	memset(buffer, 0, sizeof(struct calling_interface_buffer));
 	buffer->input[0] = wsmt->location;
 	buffer->output[0] = 99;
-	dell_smbios_smm_call(buffer);
+	dell_smbios_smm_call(dev, buffer);
 	if (buffer->output[0] == 99)
 		return true;
 
@@ -109,7 +109,7 @@ int init_dell_smbios_smm(void)
 
 	dmi_walk(find_cmd_address, NULL);
 
-	if (test_wsmt_enabled()) {
+	if (test_wsmt_enabled(&platform_device->dev)) {
 		pr_debug("Disabling due to WSMT enabled\n");
 		ret = -ENODEV;
 		goto fail_wsmt;
diff --git a/drivers/platform/x86/dell/dell-smbios-wmi.c b/drivers/platform/x86/dell/dell-smbios-wmi.c
index 231fc90878bc..2108de4e48a3 100644
--- a/drivers/platform/x86/dell/dell-smbios-wmi.c
+++ b/drivers/platform/x86/dell/dell-smbios-wmi.c
@@ -83,19 +83,13 @@ static int run_smbios_call(struct wmi_device *wdev)
 	return 0;
 }
 
-static int dell_smbios_wmi_call(struct calling_interface_buffer *buffer)
+static int dell_smbios_wmi_call(struct device *dev, struct calling_interface_buffer *buffer)
 {
-	struct wmi_smbios_priv *priv;
+	struct wmi_smbios_priv *priv = dev_get_drvdata(dev);
 	size_t difference;
 	size_t size;
 	int ret;
 
-	guard(rwsem_read)(&list_lock);
-
-	priv = get_first_smbios_priv();
-	if (!priv)
-		return -ENODEV;
-
 	size = sizeof(struct calling_interface_buffer);
 	difference = priv->req_buf_size - sizeof(u64) - size;
 
diff --git a/drivers/platform/x86/dell/dell-smbios.h b/drivers/platform/x86/dell/dell-smbios.h
index f421b8533a9e..1e64803bc00d 100644
--- a/drivers/platform/x86/dell/dell-smbios.h
+++ b/drivers/platform/x86/dell/dell-smbios.h
@@ -47,6 +47,8 @@
 
 struct notifier_block;
 
+typedef int (*smbios_callback_fn_t)(struct device *dev, struct calling_interface_buffer *buffer);
+
 struct calling_interface_token {
 	u16 tokenID;
 	u16 location;
@@ -64,7 +66,7 @@ struct calling_interface_structure {
 	struct calling_interface_token tokens[];
 } __packed;
 
-int dell_smbios_register_device(struct device *d, int priority, void *call_fn);
+int dell_smbios_register_device(struct device *d, int priority, smbios_callback_fn_t call_fn);
 void dell_smbios_unregister_device(struct device *d);
 
 int dell_smbios_error(int value);
-- 
2.39.5