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Date: Sun, 13 Apr 2008 11:50:07 -0300
From: Thiago Galesi <thiagogalesi@...il.com>
To: linux-kernel@...r.kernel.org
Cc: linux-fbdev-devel@...ts.sourceforge.net
Subject: [PATCH] fb: Remove use of lock_kernel / unlock_kernel in fbmem
Hello
This patch removes lock_kernel(), unlock_kernel() usage in fbmem.c and replaces it with a mutex
Signed-off-by: Thiago Galesi <thiagogalesi@...il.com>
---
Index: linux-2.6.23.1/drivers/video/fbmem.c
===================================================================
--- linux-2.6.23.1.orig/drivers/video/fbmem.c 2007-10-12 13:43:44.000000000 -0300
+++ linux-2.6.23.1/drivers/video/fbmem.c 2008-04-12 15:08:04.000000000 -0300
@@ -1208,7 +1208,7 @@
struct fb_ops *fb = info->fbops;
long ret = -ENOIOCTLCMD;
- lock_kernel();
+ mutex_lock(&info->hwlock);
switch(cmd) {
case FBIOGET_VSCREENINFO:
case FBIOPUT_VSCREENINFO:
@@ -1234,7 +1234,7 @@
ret = fb->fb_compat_ioctl(info, cmd, arg);
break;
}
- unlock_kernel();
+ mutex_unlock(&info->hwlock);
return ret;
}
#endif
@@ -1256,13 +1256,13 @@
return -ENODEV;
if (fb->fb_mmap) {
int res;
- lock_kernel();
+ mutex_lock(&info->hwlock);
res = fb->fb_mmap(info, vma);
- unlock_kernel();
+ mutex_unlock(&info->hwlock);
return res;
}
- lock_kernel();
+ mutex_lock(&info->hwlock);
/* frame buffer memory */
start = info->fix.smem_start;
@@ -1271,13 +1271,13 @@
/* memory mapped io */
off -= len;
if (info->var.accel_flags) {
- unlock_kernel();
+ mutex_unlock(&info->hwlock);
return -EINVAL;
}
start = info->fix.mmio_start;
len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
}
- unlock_kernel();
+ mutex_unlock(&info->hwlock);
start &= PAGE_MASK;
if ((vma->vm_end - vma->vm_start + off) > len)
return -EINVAL;
@@ -1323,11 +1323,11 @@
{
struct fb_info * const info = file->private_data;
- lock_kernel();
+ mutex_lock(&info->hwlock);
if (info->fbops->fb_release)
info->fbops->fb_release(info,1);
module_put(info->fbops->owner);
- unlock_kernel();
+ mutex_unlock(&info->hwlock);
return 0;
}
@@ -1413,6 +1413,8 @@
event.info = fb_info;
fb_notifier_call_chain(FB_EVENT_FB_REGISTERED, &event);
+
+ mutex_init(&fb_info->hwlock);
return 0;
}
@@ -1464,6 +1466,7 @@
device_destroy(fb_class, MKDEV(FB_MAJOR, i));
event.info = fb_info;
fb_notifier_call_chain(FB_EVENT_FB_UNREGISTERED, &event);
+ mutex_destroy(&fb_info.hwlock);
done:
return ret;
}
Index: linux-2.6.23.1/include/linux/fb.h
===================================================================
--- linux-2.6.23.1.orig/include/linux/fb.h 2007-10-12 13:43:44.000000000 -0300
+++ linux-2.6.23.1/include/linux/fb.h 2008-04-12 15:06:41.000000000 -0300
@@ -802,6 +802,7 @@
struct list_head modelist; /* mode list */
struct fb_videomode *mode; /* current mode */
+ struct mutex hwlock; /* mutex for protecting hw ops */
#ifdef CONFIG_FB_BACKLIGHT
/* assigned backlight device */
/* set before framebuffer registration,
--
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