The patch titled
fb: convert lock/unlock_kernel() into local fb mutex
has been removed from the -mm tree. Its filename was
fb-convert-lock-unlock_kernel-into-local-fb-mutex.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: fb: convert lock/unlock_kernel() into local fb mutex
From: Krzysztof Helt <krzysztof.h1@xxxxx>
Change lock_kernel()/unlock_kernel() to local fb mutex. Each frame buffer
instance has its own mutex.
The one line try_to_load() function is unrolled to request_module() in two
places for readability.
[righi.andrea@xxxxxxxxx: fb: fix NULL pointer BUG dereference in fb_open()]
Signed-off-by: Krzysztof Helt <krzysztof.h1@xxxxx>
Signed-off-by: Andrea Righi <righi.andrea@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/video/fbmem.c | 39 ++++++++++++++++++++-------------------
include/linux/fb.h | 1 +
2 files changed, 21 insertions(+), 19 deletions(-)
diff -puN drivers/video/fbmem.c~fb-convert-lock-unlock_kernel-into-local-fb-mutex drivers/video/fbmem.c
--- a/drivers/video/fbmem.c~fb-convert-lock-unlock_kernel-into-local-fb-mutex
+++ a/drivers/video/fbmem.c
@@ -1018,12 +1018,12 @@ fb_ioctl(struct file *file, unsigned int
void __user *argp = (void __user *)arg;
long ret = 0;
- lock_kernel();
info = registered_fb[fbidx];
+ mutex_lock(&info->lock);
fb = info->fbops;
if (!fb) {
- unlock_kernel();
+ mutex_unlock(&info->lock);
return -ENODEV;
}
switch (cmd) {
@@ -1126,7 +1126,7 @@ fb_ioctl(struct file *file, unsigned int
else
ret = fb->fb_ioctl(info, cmd, arg);
}
- unlock_kernel();
+ mutex_unlock(&info->lock);
return ret;
}
@@ -1253,7 +1253,7 @@ fb_compat_ioctl(struct file *file, unsig
struct fb_ops *fb = info->fbops;
long ret = -ENOIOCTLCMD;
- lock_kernel();
+ mutex_lock(&info->lock);
switch(cmd) {
case FBIOGET_VSCREENINFO:
case FBIOPUT_VSCREENINFO:
@@ -1279,7 +1279,7 @@ fb_compat_ioctl(struct file *file, unsig
ret = fb->fb_compat_ioctl(info, cmd, arg);
break;
}
- unlock_kernel();
+ mutex_unlock(&info->lock);
return ret;
}
#endif
@@ -1301,13 +1301,13 @@ fb_mmap(struct file *file, struct vm_are
return -ENODEV;
if (fb->fb_mmap) {
int res;
- lock_kernel();
+ mutex_lock(&info->lock);
res = fb->fb_mmap(info, vma);
- unlock_kernel();
+ mutex_unlock(&info->lock);
return res;
}
- lock_kernel();
+ mutex_lock(&info->lock);
/* frame buffer memory */
start = info->fix.smem_start;
@@ -1316,13 +1316,13 @@ fb_mmap(struct file *file, struct vm_are
/* memory mapped io */
off -= len;
if (info->var.accel_flags) {
- unlock_kernel();
+ mutex_unlock(&info->lock);
return -EINVAL;
}
start = info->fix.mmio_start;
len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
}
- unlock_kernel();
+ mutex_unlock(&info->lock);
start &= PAGE_MASK;
if ((vma->vm_end - vma->vm_start + off) > len)
return -EINVAL;
@@ -1346,13 +1346,13 @@ fb_open(struct inode *inode, struct file
if (fbidx >= FB_MAX)
return -ENODEV;
- lock_kernel();
- if (!(info = registered_fb[fbidx]))
+ info = registered_fb[fbidx];
+ if (!info)
request_module("fb%d", fbidx);
- if (!(info = registered_fb[fbidx])) {
- res = -ENODEV;
- goto out;
- }
+ info = registered_fb[fbidx];
+ if (!info)
+ return -ENODEV;
+ mutex_lock(&info->lock);
if (!try_module_get(info->fbops->owner)) {
res = -ENODEV;
goto out;
@@ -1368,7 +1368,7 @@ fb_open(struct inode *inode, struct file
fb_deferred_io_open(info, inode, file);
#endif
out:
- unlock_kernel();
+ mutex_unlock(&info->lock);
return res;
}
@@ -1377,11 +1377,11 @@ fb_release(struct inode *inode, struct f
{
struct fb_info * const info = file->private_data;
- lock_kernel();
+ mutex_lock(&info->lock);
if (info->fbops->fb_release)
info->fbops->fb_release(info,1);
module_put(info->fbops->owner);
- unlock_kernel();
+ mutex_unlock(&info->lock);
return 0;
}
@@ -1460,6 +1460,7 @@ register_framebuffer(struct fb_info *fb_
if (!registered_fb[i])
break;
fb_info->node = i;
+ mutex_init(&fb_info->lock);
fb_info->dev = device_create(fb_class, fb_info->device,
MKDEV(FB_MAJOR, i), NULL, "fb%d", i);
diff -puN include/linux/fb.h~fb-convert-lock-unlock_kernel-into-local-fb-mutex include/linux/fb.h
--- a/include/linux/fb.h~fb-convert-lock-unlock_kernel-into-local-fb-mutex
+++ a/include/linux/fb.h
@@ -808,6 +808,7 @@ struct fb_tile_ops {
struct fb_info {
int node;
int flags;
+ struct mutex lock; /* Lock for open/release/ioctl funcs */
struct fb_var_screeninfo var; /* Current var */
struct fb_fix_screeninfo fix; /* Current fix */
struct fb_monspecs monspecs; /* Current Monitor specs */
_
Patches currently in -mm which might be from krzysztof.h1@xxxxx are
origin.patch
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