[PATCH v2 4/4] fbdev/vesafb: Use screen_info pointer from device

[Thomas Zimmermann <tzimmermann@suse.de>]

Use the screen_info instance from the device instead of dereferencing
the global screen_info state. Decouples the driver from per-architecture
code. Duplicated the screen_info data, so that vesafb can modify it at
will.

v2:
	* comment on devm_kmemdup() usage (Javier)

Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
---
 drivers/video/fbdev/vesafb.c | 14 +++++++++++++-
 1 file changed, 13 insertions(+), 1 deletion(-)

diff --git a/drivers/video/fbdev/vesafb.c b/drivers/video/fbdev/vesafb.c
index ea89accbec385..8ab64ae4cad3e 100644
--- a/drivers/video/fbdev/vesafb.c
+++ b/drivers/video/fbdev/vesafb.c
@@ -243,7 +243,7 @@ static int vesafb_setup(char *options)
 
 static int vesafb_probe(struct platform_device *dev)
 {
-	struct screen_info *si = &screen_info;
+	struct screen_info *si;
 	struct fb_info *info;
 	struct vesafb_par *par;
 	int i, err;
@@ -252,6 +252,18 @@ static int vesafb_probe(struct platform_device *dev)
 	unsigned int size_total;
 	char *option = NULL;
 
+	/*
+	 * If we fail probing the device, the kernel might try a different
+	 * driver. We get a copy of the attached screen_info, so that we can
+	 * modify its values without affecting later drivers.
+	 */
+	si = dev_get_platdata(&dev->dev);
+	if (!si)
+		return -ENODEV;
+	si = devm_kmemdup(&dev->dev, si, sizeof(*si), GFP_KERNEL);
+	if (!si)
+		return -ENOMEM;
+
 	/* ignore error return of fb_get_options */
 	fb_get_options("vesafb", &option);
 	vesafb_setup(option);
-- 
2.43.0