linux-kernel - [PATCH] tty: hvc-iucv: fix function pointer casts

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Message-Id: <20240213101756.461701-1-arnd@kernel.org>
Date: Tue, 13 Feb 2024 11:17:49 +0100
From: Arnd Bergmann <arnd@...nel.org>
To: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	Jiri Slaby <jirislaby@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>,
	Nathan Chancellor <nathan@...nel.org>,
	Nick Desaulniers <ndesaulniers@...gle.com>,
	Bill Wendling <morbo@...gle.com>,
	Justin Stitt <justinstitt@...gle.com>,
	linuxppc-dev@...ts.ozlabs.org,
	linux-kernel@...r.kernel.org,
	linux-serial@...r.kernel.org,
	llvm@...ts.linux.dev
Subject: [PATCH] tty: hvc-iucv: fix function pointer casts

From: Arnd Bergmann <arnd@...db.de>

clang warns about explicitly casting between incompatible function
pointers:

drivers/tty/hvc/hvc_iucv.c:1100:23: error: cast from 'void (*)(const void *)' to 'void (*)(struct device *)' converts to incompatible function type [-Werror,-Wcast-function-type-strict]
 1100 |         priv->dev->release = (void (*)(struct device *)) kfree;
      |                              ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Add a separate function to handle this correctly.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
---
 drivers/tty/hvc/hvc_iucv.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/tty/hvc/hvc_iucv.c b/drivers/tty/hvc/hvc_iucv.c
index fdecc0d63731..b1149bc62ca1 100644
--- a/drivers/tty/hvc/hvc_iucv.c
+++ b/drivers/tty/hvc/hvc_iucv.c
@@ -1035,6 +1035,10 @@ static const struct attribute_group *hvc_iucv_dev_attr_groups[] = {
 	NULL,
 };
 
+static void hvc_iucv_free(struct device *data)
+{
+	kfree(data);
+}
 
 /**
  * hvc_iucv_alloc() - Allocates a new struct hvc_iucv_private instance
@@ -1097,7 +1101,7 @@ static int __init hvc_iucv_alloc(int id, unsigned int is_console)
 	priv->dev->bus = &iucv_bus;
 	priv->dev->parent = iucv_root;
 	priv->dev->groups = hvc_iucv_dev_attr_groups;
-	priv->dev->release = (void (*)(struct device *)) kfree;
+	priv->dev->release = hvc_iucv_free;
 	rc = device_register(priv->dev);
 	if (rc) {
 		put_device(priv->dev);
-- 
2.39.2