HID: hid-lg4ff: Store pointer to the output HID report struct in the device entry struct

Store pointer to the output HID report struct in the device entry struct.
This eliminates the need to look the HID report struct up every time it is needed.

Signed-off-by: Michal Malý <madcatxster@devoid-pointer.net>
Signed-off-by: Jiri Kosina <jkosina@suse.cz>

drivers/hid/hid-lg4ff.c

@@ -90,6 +90,7 @@ struct lg4ff_wheel_data {
 
 struct lg4ff_device_entry {
 	spinlock_t report_lock; /* Protect output HID report */
+	struct hid_report *report;
 	struct lg4ff_wheel_data wdata;
 };
 
@@ -302,12 +303,10 @@ int lg4ff_adjust_input_event(struct hid_device *hid, struct hid_field *field,
 static int lg4ff_play(struct input_dev *dev, void *data, struct ff_effect *effect)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
-	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
-	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 	struct lg4ff_device_entry *entry;
 	struct lg_drv_data *drv_data;
 	unsigned long flags;
-	s32 *value = report->field[0]->value;
+	s32 *value;
 	int x;
 
 	drv_data = hid_get_drvdata(hid);
@@ -321,6 +320,7 @@ static int lg4ff_play(struct input_dev *dev, void *data, struct ff_effect *effec
 		hid_err(hid, "Device properties not found!\n");
 		return -EINVAL;
 	}
+	value = entry->report->field[0]->value;
 
 #define CLAMP(x) do { if (x < 0) x = 0; else if (x > 0xff) x = 0xff; } while (0)
 
@@ -340,7 +340,7 @@ static int lg4ff_play(struct input_dev *dev, void *data, struct ff_effect *effec
 			value[5] = 0x00;
 			value[6] = 0x00;
 
-			hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+			hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 			spin_unlock_irqrestore(&entry->report_lock, flags);
 			return 0;
 		}
@@ -353,7 +353,7 @@ static int lg4ff_play(struct input_dev *dev, void *data, struct ff_effect *effec
 		value[5] = 0x00;
 		value[6] = 0x00;
 
-		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+		hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 		spin_unlock_irqrestore(&entry->report_lock, flags);
 		break;
 	}
@@ -384,6 +384,7 @@ static void lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
 		hid_err(hid, "Device properties not found!\n");
 		return;
 	}
+	value = entry->report->field[0]->value;
 
 	/* De-activate Auto-Center */
 	spin_lock_irqsave(&entry->report_lock, flags);
@@ -396,7 +397,7 @@ static void lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
 		value[5] = 0x00;
 		value[6] = 0x00;
 
-		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+		hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 		spin_unlock_irqrestore(&entry->report_lock, flags);
 		return;
 	}
@@ -427,7 +428,7 @@ static void lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
 	value[5] = 0x00;
 	value[6] = 0x00;
 
-	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+	hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 
 	/* Activate Auto-Center */
 	value[0] = 0x14;
@@ -438,7 +439,7 @@ static void lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
 	value[5] = 0x00;
 	value[6] = 0x00;
 
-	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+	hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 	spin_unlock_irqrestore(&entry->report_lock, flags);
 }
 
@@ -446,12 +447,10 @@ static void lg4ff_set_autocenter_default(struct input_dev *dev, u16 magnitude)
 static void lg4ff_set_autocenter_ffex(struct input_dev *dev, u16 magnitude)
 {
 	struct hid_device *hid = input_get_drvdata(dev);
-	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
-	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 	struct lg4ff_device_entry *entry;
 	struct lg_drv_data *drv_data;
 	unsigned long flags;
-	s32 *value = report->field[0]->value;
+	s32 *value;
 	magnitude = magnitude * 90 / 65535;
 
 	drv_data = hid_get_drvdata(hid);
@@ -465,6 +464,7 @@ static void lg4ff_set_autocenter_ffex(struct input_dev *dev, u16 magnitude)
 		hid_err(hid, "Device properties not found!\n");
 		return;
 	}
+	value = entry->report->field[0]->value;
 
 	spin_lock_irqsave(&entry->report_lock, flags);
 	value[0] = 0xfe;
@@ -475,19 +475,17 @@ static void lg4ff_set_autocenter_ffex(struct input_dev *dev, u16 magnitude)
 	value[5] = 0x00;
 	value[6] = 0x00;
 
-	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+	hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 	spin_unlock_irqrestore(&entry->report_lock, flags);
 }
 
 /* Sends command to set range compatible with G25/G27/Driving Force GT */
 static void lg4ff_set_range_g25(struct hid_device *hid, u16 range)
 {
-	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
-	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 	struct lg4ff_device_entry *entry;
 	struct lg_drv_data *drv_data;
 	unsigned long flags;
-	s32 *value = report->field[0]->value;
+	s32 *value;
 
 	drv_data = hid_get_drvdata(hid);
 	if (!drv_data) {
@@ -500,7 +498,7 @@ static void lg4ff_set_range_g25(struct hid_device *hid, u16 range)
 		hid_err(hid, "Device properties not found!\n");
 		return;
 	}
-
+	value = entry->report->field[0]->value;
 	dbg_hid("G25/G27/DFGT: setting range to %u\n", range);
 
 	spin_lock_irqsave(&entry->report_lock, flags);
@@ -512,20 +510,18 @@ static void lg4ff_set_range_g25(struct hid_device *hid, u16 range)
 	value[5] = 0x00;
 	value[6] = 0x00;
 
-	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+	hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 	spin_unlock_irqrestore(&entry->report_lock, flags);
 }
 
 /* Sends commands to set range compatible with Driving Force Pro wheel */
 static void lg4ff_set_range_dfp(struct hid_device *hid, u16 range)
 {
-	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
-	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
-	int start_left, start_right, full_range;
 	struct lg4ff_device_entry *entry;
 	struct lg_drv_data *drv_data;
 	unsigned long flags;
-	s32 *value = report->field[0]->value;
+	int start_left, start_right, full_range;
+	s32 *value;
 
 	drv_data = hid_get_drvdata(hid);
 	if (!drv_data) {
@@ -538,7 +534,7 @@ static void lg4ff_set_range_dfp(struct hid_device *hid, u16 range)
 		hid_err(hid, "Device properties not found!\n");
 		return;
 	}
-
+	value = entry->report->field[0]->value;
 	dbg_hid("Driving Force Pro: setting range to %u\n", range);
 
 	/* Prepare "coarse" limit command */
@@ -552,13 +548,13 @@ static void lg4ff_set_range_dfp(struct hid_device *hid, u16 range)
 	value[6] = 0x00;
 
 	if (range > 200) {
-		report->field[0]->value[1] = 0x03;
+		value[1] = 0x03;
 		full_range = 900;
 	} else {
-		report->field[0]->value[1] = 0x02;
+		value[1] = 0x02;
 		full_range = 200;
 	}
-	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+	hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 
 	/* Prepare "fine" limit command */
 	value[0] = 0x81;
@@ -570,7 +566,7 @@ static void lg4ff_set_range_dfp(struct hid_device *hid, u16 range)
 	value[6] = 0x00;
 
 	if (range == 200 || range == 900) {	/* Do not apply any fine limit */
-		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+		hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 		spin_unlock_irqrestore(&entry->report_lock, flags);
 		return;
 	}
@@ -585,7 +581,7 @@ static void lg4ff_set_range_dfp(struct hid_device *hid, u16 range)
 	value[5] = (start_right & 0xe) << 4 | (start_left & 0xe);
 	value[6] = 0xff;
 
-	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+	hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 	spin_unlock_irqrestore(&entry->report_lock, flags);
 }
 
@@ -648,12 +644,10 @@ static const struct lg4ff_compat_mode_switch *lg4ff_get_mode_switch_command(cons
 
 static int lg4ff_switch_compatibility_mode(struct hid_device *hid, const struct lg4ff_compat_mode_switch *s)
 {
-	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
-	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 	struct lg4ff_device_entry *entry;
 	struct lg_drv_data *drv_data;
 	unsigned long flags;
-	s32 *value = report->field[0]->value;
+	s32 *value;
 	u8 i;
 
 	drv_data = hid_get_drvdata(hid);
@@ -667,6 +661,7 @@ static int lg4ff_switch_compatibility_mode(struct hid_device *hid, const struct
 		hid_err(hid, "Device properties not found!\n");
 		return -EINVAL;
 	}
+	value = entry->report->field[0]->value;
 
 	spin_lock_irqsave(&entry->report_lock, flags);
 	for (i = 0; i < s->cmd_count; i++) {
@@ -675,7 +670,7 @@ static int lg4ff_switch_compatibility_mode(struct hid_device *hid, const struct
 		for (j = 0; j < 7; j++)
 			value[j] = s->cmd[j + (7*i)];
 
-		hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+		hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 	}
 	spin_unlock_irqrestore(&entry->report_lock, flags);
 	hid_hw_wait(hid);
@@ -916,12 +911,10 @@ static DEVICE_ATTR(real_id, S_IRUGO, lg4ff_real_id_show, lg4ff_real_id_store);
 #ifdef CONFIG_LEDS_CLASS
 static void lg4ff_set_leds(struct hid_device *hid, u8 leds)
 {
-	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
-	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 	struct lg_drv_data *drv_data;
 	struct lg4ff_device_entry *entry;
 	unsigned long flags;
-	s32 *value = report->field[0]->value;
+	s32 *value;
 
 	drv_data = hid_get_drvdata(hid);
 	if (!drv_data) {
@@ -934,6 +927,7 @@ static void lg4ff_set_leds(struct hid_device *hid, u8 leds)
 		hid_err(hid, "Device properties not found!\n");
 		return;
 	}
+	value = entry->report->field[0]->value;
 
 	spin_lock_irqsave(&entry->report_lock, flags);
 	value[0] = 0xf8;
@@ -943,7 +937,7 @@ static void lg4ff_set_leds(struct hid_device *hid, u8 leds)
 	value[4] = 0x00;
 	value[5] = 0x00;
 	value[6] = 0x00;
-	hid_hw_request(hid, report, HID_REQ_SET_REPORT);
+	hid_hw_request(hid, entry->report, HID_REQ_SET_REPORT);
 	spin_unlock_irqrestore(&entry->report_lock, flags);
 }
 
@@ -1104,6 +1098,8 @@ int lg4ff_init(struct hid_device *hid)
 {
 	struct hid_input *hidinput = list_entry(hid->inputs.next, struct hid_input, list);
 	struct input_dev *dev = hidinput->input;
+	struct list_head *report_list = &hid->report_enum[HID_OUTPUT_REPORT].report_list;
+	struct hid_report *report = list_entry(report_list->next, struct hid_report, list);
 	const struct usb_device_descriptor *udesc = &(hid_to_usb_dev(hid)->descriptor);
 	const u16 bcdDevice = le16_to_cpu(udesc->bcdDevice);
 	struct lg4ff_device_entry *entry;
@@ -1125,6 +1121,7 @@ int lg4ff_init(struct hid_device *hid)
 	if (!entry)
 		return -ENOMEM;
 	spin_lock_init(&entry->report_lock);
+	entry->report = report;
 	drv_data->device_props = entry;
 
 	/* Check if a multimode wheel has been connected and