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From: Marcin Slusarz on 20 Jul 2010 15:30
We don't want vga16fb to mess with hardware initialized by other driver.
Detect it and refuse to load.
It fixes nouveau interrupt storm on some machines.

Signed-off-by: Marcin Slusarz <marcin.slusarz(a)gmail.com>
---
drivers/video/vga16fb.c | 13 ++++++++++++-
1 files changed, 12 insertions(+), 1 deletions(-)

diff --git a/drivers/video/vga16fb.c b/drivers/video/vga16fb.c
index 28ccab4..4505446 100644
--- a/drivers/video/vga16fb.c
+++ b/drivers/video/vga16fb.c
@@ -22,6 +22,7 @@
#include <linux/platform_device.h>
#include <linux/screen_info.h>

+#include <asm/fb.h>
#include <asm/io.h>
#include <video/vga.h>

@@ -1415,7 +1416,7 @@ static struct platform_device *vga16fb_device;

static int __init vga16fb_init(void)
{
- int ret;
+ int ret, i;
#ifndef MODULE
char *option = NULL;

@@ -1424,6 +1425,16 @@ static int __init vga16fb_init(void)

vga16fb_setup(option);
#endif
+ for (i = 0 ; i < FB_MAX; i++) {
+ if (!registered_fb[i])
+ continue;
+ if (fb_is_primary_device(registered_fb[i])) {
+ printk(KERN_INFO "vga16fb: %s is driving the primary card, refusing to load\n",
+ registered_fb[i]->fix.id);
+ return -EBUSY;
+ }
+ }
+
ret = platform_driver_register(&vga16fb_driver);

if (!ret) {
--
1.7.1


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Prev: x86, xsave: some code cleanups and reworks
Next: trace-cmd: Fix a couple of crashes.