[PATCH] Handle efifb with no lfb_base better.

[Peter Jones]

Right now we get a WARN from platform_device_unregister() because our
platform_device has no ->release function.  This is clearly wrong, but
we should be warning so we can figure out what happened, as this failure
results in bug reports.  So WARN() about the real problem, and use the
registration function that gives us a default release() function.

This fixes the tracback reported at
https://bugzilla.redhat.com/show_bug.cgi?id=840621 , though it does not
fix the actual /problem/ the user is seeing.

Signed-off-by: Peter Jones <pjones@xxxxxxxxxx>
---
 drivers/video/efifb.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/drivers/video/efifb.c b/drivers/video/efifb.c
index 50fe668..390b61b 100644
--- a/drivers/video/efifb.c
+++ b/drivers/video/efifb.c
@@ -285,6 +285,7 @@ static void efifb_destroy(struct fb_info *info)
 {
 	if (info->screen_base)
 		iounmap(info->screen_base);
+	fb_dealloc_cmap(&info->cmap);
 	if (request_mem_succeeded)
 		release_mem_region(info->apertures->ranges[0].base,
 				   info->apertures->ranges[0].size);
@@ -382,6 +383,8 @@ static int __init efifb_probe(struct platform_device *dev)
 	if (!screen_info.pages)
 		screen_info.pages = 1;
 	if (!screen_info.lfb_base) {
+		WARN(1, KERN_WARNING, "invalid framebuffer address for "
+				      "device '%s'\n", dev_name(dev));
 		printk(KERN_DEBUG "efifb: invalid framebuffer address\n");
 		return -ENODEV;
 	}
@@ -544,9 +547,7 @@ static struct platform_driver efifb_driver = {
 	},
 };
 
-static struct platform_device efifb_device = {
-	.name	= "efifb",
-};
+static struct platform_device *efifb_device;
 
 static int __init efifb_init(void)
 {
@@ -571,9 +572,9 @@ static int __init efifb_init(void)
 	if (!screen_info.lfb_linelength)
 		return -ENODEV;
 
-	ret = platform_device_register(&efifb_device);
-	if (ret)
-		return ret;
+	efifb_device = platform_device_register_simple("efifb", 0, NULL, 0);
+	if (IS_ERROR(efifb_device))
+		return PTR_ERR(efifb_device);
 
 	/*
 	 * This is not just an optimization.  We will interfere
@@ -582,7 +583,7 @@ static int __init efifb_init(void)
 	 */
 	ret = platform_driver_probe(&efifb_driver, efifb_probe);
 	if (ret) {
-		platform_device_unregister(&efifb_device);
+		platform_device_unregister(efifb_device);
 		return ret;
 	}
 
-- 
1.8.1.4

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