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vm: convert fb_mmap to vm_iomap_memory() helper

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commit fc9bbca8f6 upstream.

This is my example conversion of a few existing mmap users.  The
fb_mmap() case is a good example because it is a bit more complicated
than some: fb_mmap() mmaps one of two different memory areas depending
on the page offset of the mmap (but happily there is never any mixing of
the two, so the helper function still works).

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Linus Torvalds 2013-04-19 09:57:35 -07:00 committed by Greg Kroah-Hartman
parent ada37d8578
commit b67bca9e17
1 changed files with 14 additions and 26 deletions
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40
drivers/video/fbmem.c
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@ -1364,15 +1364,12 @@ fb_mmap(struct file *file, struct vm_area_struct * vma)
{
struct fb_info *info = file_fb_info(file);
struct fb_ops *fb;
unsigned long off;
unsigned long mmio_pgoff;
unsigned long start;
u32 len;
if (!info)
return -ENODEV;
if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
return -EINVAL;
off = vma->vm_pgoff << PAGE_SHIFT;
fb = info->fbops;
if (!fb)
return -ENODEV;
@ -1384,33 +1381,24 @@ fb_mmap(struct file *file, struct vm_area_struct * vma)
return res;
}
/* frame buffer memory */
/*
* Ugh. This can be either the frame buffer mapping, or
* if pgoff points past it, the mmio mapping.
*/
start = info->fix.smem_start;
len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.smem_len);
if (off >= len) {
/* memory mapped io */
off -= len;
if (info->var.accel_flags) {
mutex_unlock(&info->mm_lock);
return -EINVAL;
}
len = info->fix.smem_len;
mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
if (vma->vm_pgoff >= mmio_pgoff) {
vma->vm_pgoff -= mmio_pgoff;
start = info->fix.mmio_start;
len = PAGE_ALIGN((start & ~PAGE_MASK) + info->fix.mmio_len);
len = info->fix.mmio_len;
}
mutex_unlock(&info->mm_lock);
start &= PAGE_MASK;
if ((vma->vm_end - vma->vm_start + off) > len)
return -EINVAL;
off += start;
vma->vm_pgoff = off >> PAGE_SHIFT;
/* This is an IO map - tell maydump to skip this VMA */
vma->vm_flags |= VM_IO | VM_RESERVED;
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
fb_pgprotect(file, vma, off);
if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
vma->vm_end - vma->vm_start, vma->vm_page_prot))
return -EAGAIN;
return 0;
fb_pgprotect(file, vma, start);
return vm_iomap_memory(vma, start, len);
}
static int