auxdisplay: hd44780: Call charlcd_alloc() from hd44780_common_alloc()

HD44780 APIs all operate on struct charlcd objects. Moreover, the current users
always call charlcd_alloc() and hd44780_common_alloc(). Make the latter call
the former, so eliminate the additional allocation, to make it consistent with
the rest of API and avoid duplication.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Reviewed-by: Geert Uytterhoeven <geert@linux-m68k.org>

Author: andy-shev

drivers/auxdisplay/hd44780.c

@@ -222,20 +222,17 @@ static int hd44780_probe(struct platform_device *pdev)
 		return -EINVAL;
 	}
 
-	hdc = hd44780_common_alloc();
-	if (!hdc)
-		return -ENOMEM;
-
-	lcd = charlcd_alloc(0);
+	lcd = hd44780_common_alloc();
 	if (!lcd)
-		goto fail1;
+		return -ENOMEM;
 
 	hd = kzalloc(sizeof(*hd), GFP_KERNEL);
 	if (!hd)
 		goto fail2;
 
+	hdc = lcd->drvdata;
 	hdc->hd44780 = hd;
-	lcd->drvdata = hdc;
+
 	for (i = 0; i < ifwidth; i++) {
 		hd->pins[base + i] = devm_gpiod_get_index(dev, "data", i,
 							  GPIOD_OUT_LOW);
@@ -313,9 +310,7 @@ static int hd44780_probe(struct platform_device *pdev)
 fail3:
 	kfree(hd);
 fail2:
-	charlcd_free(lcd);
-fail1:
-	hd44780_common_free(hdc);
+	hd44780_common_free(lcd);
 	return ret;
 }
 
@@ -326,8 +321,7 @@ static void hd44780_remove(struct platform_device *pdev)
 
 	charlcd_unregister(lcd);
 	kfree(hdc->hd44780);
-	hd44780_common_free(hdc);
-	charlcd_free(lcd);
+	hd44780_common_free(lcd);
 }
 
 static const struct of_device_id hd44780_of_match[] = {

drivers/auxdisplay/hd44780_common.c

@@ -351,24 +351,26 @@ int hd44780_common_redefine_char(struct charlcd *lcd, char *esc)
 }
 EXPORT_SYMBOL_GPL(hd44780_common_redefine_char);
 
-struct hd44780_common *hd44780_common_alloc(void)
+struct charlcd *hd44780_common_alloc(void)
 {
 	struct hd44780_common *hd;
+	struct charlcd *lcd;
 
-	hd = kzalloc(sizeof(*hd), GFP_KERNEL);
-	if (!hd)
+	lcd = charlcd_alloc(sizeof(*hd));
+	if (!lcd)
 		return NULL;
 
+	hd = lcd->drvdata;
 	hd->ifwidth = 8;
 	hd->bwidth = DEFAULT_LCD_BWIDTH;
 	hd->hwidth = DEFAULT_LCD_HWIDTH;
-	return hd;
+	return lcd;
 }
 EXPORT_SYMBOL_GPL(hd44780_common_alloc);
 
-void hd44780_common_free(struct hd44780_common *hd)
+void hd44780_common_free(struct charlcd *lcd)
 {
-	kfree(hd);
+	charlcd_free(lcd);
 }
 EXPORT_SYMBOL_GPL(hd44780_common_free);
 

drivers/auxdisplay/hd44780_common.h

@@ -31,5 +31,5 @@ int hd44780_common_fontsize(struct charlcd *lcd, enum charlcd_fontsize size);
 int hd44780_common_lines(struct charlcd *lcd, enum charlcd_lines lines);
 int hd44780_common_redefine_char(struct charlcd *lcd, char *esc);
 
-struct hd44780_common *hd44780_common_alloc(void);
-void hd44780_common_free(struct hd44780_common *hd);
+struct charlcd *hd44780_common_alloc(void);
+void hd44780_common_free(struct charlcd *lcd);

drivers/auxdisplay/panel.c

@@ -831,18 +831,12 @@ static void lcd_init(void)
 	struct charlcd *charlcd;
 	struct hd44780_common *hdc;
 
-	hdc = hd44780_common_alloc();
-	if (!hdc)
+	charlcd = hd44780_common_alloc();
+	if (!charlcd)
 		return;
 
-	charlcd = charlcd_alloc(0);
-	if (!charlcd) {
-		hd44780_common_free(hdc);
-		return;
-	}
-
+	hdc = charlcd->drvdata;
 	hdc->hd44780 = &lcd;
-	charlcd->drvdata = hdc;
 
 	/*
 	 * Init lcd struct with load-time values to preserve exact
@@ -1664,7 +1658,7 @@ static void panel_attach(struct parport *port)
 	if (lcd.enabled)
 		charlcd_unregister(lcd.charlcd);
 err_unreg_device:
-	charlcd_free(lcd.charlcd);
+	hd44780_common_free(lcd.charlcd);
 	lcd.charlcd = NULL;
 	parport_unregister_device(pprt);
 	pprt = NULL;
@@ -1691,8 +1685,7 @@ static void panel_detach(struct parport *port)
 	if (lcd.enabled) {
 		charlcd_unregister(lcd.charlcd);
 		lcd.initialized = false;
-		hd44780_common_free(lcd.charlcd->drvdata);
-		charlcd_free(lcd.charlcd);
+		hd44780_common_free(lcd.charlcd);
 		lcd.charlcd = NULL;
 	}