linux-kernel - [RFC PATCH 1/5] firmware: sysfb: Make sysfb_create

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Message-Id: <20220406160632.496684-2-javierm@redhat.com>
Date:   Wed,  6 Apr 2022 18:06:28 +0200
From:   Javier Martinez Canillas <javierm@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     Thomas Zimmermann <tzimmermann@...e.de>,
        Daniel Vetter <daniel.vetter@...ll.ch>,
        Javier Martinez Canillas <javierm@...hat.com>,
        Borislav Petkov <bp@...e.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Miaoqian Lin <linmq006@...il.com>
Subject: [RFC PATCH 1/5] firmware: sysfb: Make sysfb_create_simplefb() return a pdev pointer

This function just returned 0 on success or an errno code on error, but it
could be useful to sysfb_init() to get a pointer to the device registered.

Signed-off-by: Javier Martinez Canillas <javierm@...hat.com>
---

 drivers/firmware/sysfb.c          |  4 ++--
 drivers/firmware/sysfb_simplefb.c | 24 +++++++++++++++---------
 include/linux/sysfb.h             |  8 ++++----
 3 files changed, 21 insertions(+), 15 deletions(-)

diff --git a/drivers/firmware/sysfb.c b/drivers/firmware/sysfb.c
index 2bfbb05f7d89..b032f40a92de 100644
--- a/drivers/firmware/sysfb.c
+++ b/drivers/firmware/sysfb.c
@@ -46,8 +46,8 @@ static __init int sysfb_init(void)
 	/* try to create a simple-framebuffer device */
 	compatible = sysfb_parse_mode(si, &mode);
 	if (compatible) {
-		ret = sysfb_create_simplefb(si, &mode);
-		if (!ret)
+		pd = sysfb_create_simplefb(si, &mode);
+		if (!IS_ERR(pd))
 			return 0;
 	}
 
diff --git a/drivers/firmware/sysfb_simplefb.c b/drivers/firmware/sysfb_simplefb.c
index 76c4abc42a30..c42648ed3aad 100644
--- a/drivers/firmware/sysfb_simplefb.c
+++ b/drivers/firmware/sysfb_simplefb.c
@@ -57,8 +57,8 @@ __init bool sysfb_parse_mode(const struct screen_info *si,
 	return false;
 }
 
-__init int sysfb_create_simplefb(const struct screen_info *si,
-				 const struct simplefb_platform_data *mode)
+__init struct platform_device *sysfb_create_simplefb(const struct screen_info *si,
+						     const struct simplefb_platform_data *mode)
 {
 	struct platform_device *pd;
 	struct resource res;
@@ -76,7 +76,7 @@ __init int sysfb_create_simplefb(const struct screen_info *si,
 		base |= (u64)si->ext_lfb_base << 32;
 	if (!base || (u64)(resource_size_t)base != base) {
 		printk(KERN_DEBUG "sysfb: inaccessible VRAM base\n");
-		return -EINVAL;
+		return ERR_PTR(-EINVAL);
 	}
 
 	/*
@@ -93,7 +93,7 @@ __init int sysfb_create_simplefb(const struct screen_info *si,
 	length = mode->height * mode->stride;
 	if (length > size) {
 		printk(KERN_WARNING "sysfb: VRAM smaller than advertised\n");
-		return -EINVAL;
+		return ERR_PTR(-EINVAL);
 	}
 	length = PAGE_ALIGN(length);
 
@@ -104,25 +104,31 @@ __init int sysfb_create_simplefb(const struct screen_info *si,
 	res.start = base;
 	res.end = res.start + length - 1;
 	if (res.end <= res.start)
-		return -EINVAL;
+		return ERR_PTR(-EINVAL);
 
 	pd = platform_device_alloc("simple-framebuffer", 0);
 	if (!pd)
-		return -ENOMEM;
+		return ERR_PTR(-ENOMEM);
 
 	sysfb_apply_efi_quirks(pd);
 
 	ret = platform_device_add_resources(pd, &res, 1);
 	if (ret) {
 		platform_device_put(pd);
-		return ret;
+		return ERR_PTR(ret);
 	}
 
 	ret = platform_device_add_data(pd, mode, sizeof(*mode));
 	if (ret) {
 		platform_device_put(pd);
-		return ret;
+		return ERR_PTR(ret);
 	}
 
-	return platform_device_add(pd);
+	ret = platform_device_add(pd);
+	if (ret) {
+		platform_device_put(pd);
+		return ERR_PTR(ret);
+	}
+
+	return pd;
 }
diff --git a/include/linux/sysfb.h b/include/linux/sysfb.h
index b0dcfa26d07b..9857518f4cdd 100644
--- a/include/linux/sysfb.h
+++ b/include/linux/sysfb.h
@@ -72,8 +72,8 @@ static inline void sysfb_apply_efi_quirks(struct platform_device *pd)
 
 bool sysfb_parse_mode(const struct screen_info *si,
 		      struct simplefb_platform_data *mode);
-int sysfb_create_simplefb(const struct screen_info *si,
-			  const struct simplefb_platform_data *mode);
+struct platform_device *sysfb_create_simplefb(const struct screen_info *si,
+					      const struct simplefb_platform_data *mode);
 
 #else /* CONFIG_SYSFB_SIMPLE */
 
@@ -83,8 +83,8 @@ static inline bool sysfb_parse_mode(const struct screen_info *si,
 	return false;
 }
 
-static inline int sysfb_create_simplefb(const struct screen_info *si,
-					 const struct simplefb_platform_data *mode)
+static inline struct platform_device *sysfb_create_simplefb(const struct screen_info *si,
+							    const struct simplefb_platform_data *mode)
 {
 	return -EINVAL;
 }
-- 
2.35.1