linux-kernel - [PATCH v1 1/7] auxdisplay: charlcd: Partially revert "Move hwidth and bwidth to struct hd44780

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Message-ID: <20250224173010.219024-2-andriy.shevchenko@linux.intel.com>
Date: Mon, 24 Feb 2025 19:27:38 +0200
From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	linux-kernel@...r.kernel.org
Cc: Andy Shevchenko <andy@...nel.org>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Willy Tarreau <willy@...roxy.com>,
	Ksenija Stanojevic <ksenija.stanojevic@...il.com>
Subject: [PATCH v1 1/7] auxdisplay: charlcd: Partially revert "Move hwidth and bwidth to struct hd44780_common"

The commit 2545c1c948a6 ("auxdisplay: Move hwidth and bwidth to struct
hd44780_common") makes charlcd_alloc() argument-less effectively dropping
the single allocation for the struct charlcd_priv object along with
the driver specific one. Restore that behaviour here.

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/auxdisplay/charlcd.c | 5 +++--
 drivers/auxdisplay/charlcd.h | 5 +++--
 drivers/auxdisplay/hd44780.c | 2 +-
 drivers/auxdisplay/lcd2s.c   | 2 +-
 drivers/auxdisplay/panel.c   | 2 +-
 5 files changed, 9 insertions(+), 7 deletions(-)

diff --git a/drivers/auxdisplay/charlcd.c b/drivers/auxdisplay/charlcd.c
index 19b619376d48..09020bb8ad15 100644
--- a/drivers/auxdisplay/charlcd.c
+++ b/drivers/auxdisplay/charlcd.c
@@ -595,18 +595,19 @@ static int charlcd_init(struct charlcd *lcd)
 	return 0;
 }
 
-struct charlcd *charlcd_alloc(void)
+struct charlcd *charlcd_alloc(unsigned int drvdata_size)
 {
 	struct charlcd_priv *priv;
 	struct charlcd *lcd;
 
-	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
+	priv = kzalloc(sizeof(*priv) + drvdata_size, GFP_KERNEL);
 	if (!priv)
 		return NULL;
 
 	priv->esc_seq.len = -1;
 
 	lcd = &priv->lcd;
+	lcd->drvdata = priv->drvdata;
 
 	return lcd;
 }
diff --git a/drivers/auxdisplay/charlcd.h b/drivers/auxdisplay/charlcd.h
index 4d4287209d04..d10b89740bca 100644
--- a/drivers/auxdisplay/charlcd.h
+++ b/drivers/auxdisplay/charlcd.h
@@ -51,7 +51,7 @@ struct charlcd {
 		unsigned long y;
 	} addr;
 
-	void *drvdata;
+	void *drvdata;			/* Set by charlcd_alloc() */
 };
 
 /**
@@ -95,7 +95,8 @@ struct charlcd_ops {
 };
 
 void charlcd_backlight(struct charlcd *lcd, enum charlcd_onoff on);
-struct charlcd *charlcd_alloc(void);
+
+struct charlcd *charlcd_alloc(unsigned int drvdata_size);
 void charlcd_free(struct charlcd *lcd);
 
 int charlcd_register(struct charlcd *lcd);
diff --git a/drivers/auxdisplay/hd44780.c b/drivers/auxdisplay/hd44780.c
index 9d0ae9c02e9b..1d67fe324341 100644
--- a/drivers/auxdisplay/hd44780.c
+++ b/drivers/auxdisplay/hd44780.c
@@ -226,7 +226,7 @@ static int hd44780_probe(struct platform_device *pdev)
 	if (!hdc)
 		return -ENOMEM;
 
-	lcd = charlcd_alloc();
+	lcd = charlcd_alloc(0);
 	if (!lcd)
 		goto fail1;
 
diff --git a/drivers/auxdisplay/lcd2s.c b/drivers/auxdisplay/lcd2s.c
index f831ce762508..d573d36e3067 100644
--- a/drivers/auxdisplay/lcd2s.c
+++ b/drivers/auxdisplay/lcd2s.c
@@ -310,7 +310,7 @@ static int lcd2s_i2c_probe(struct i2c_client *i2c)
 	if (err < 0)
 		return err;
 
-	lcd = charlcd_alloc();
+	lcd = charlcd_alloc(0);
 	if (!lcd)
 		return -ENOMEM;
 
diff --git a/drivers/auxdisplay/panel.c b/drivers/auxdisplay/panel.c
index 6dc8798d01f9..4da142692d55 100644
--- a/drivers/auxdisplay/panel.c
+++ b/drivers/auxdisplay/panel.c
@@ -835,7 +835,7 @@ static void lcd_init(void)
 	if (!hdc)
 		return;
 
-	charlcd = charlcd_alloc();
+	charlcd = charlcd_alloc(0);
 	if (!charlcd) {
 		kfree(hdc);
 		return;
-- 
2.45.1.3035.g276e886db78b