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fbdev/controlfb: use vm_iomap_memory()

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Use vm_iomap_memory() instead of [io_]remap_pfn_range().
vm_iomap_memory() gives us much simpler API to map memory to userspace,
and reduces possibilities for bugs.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Tomi Valkeinen 2013-04-17 13:44:19 +03:00
parent 6d28c21fe7
commit 47f698a9f2
1 changed files with 18 additions and 28 deletions
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46
drivers/video/controlfb.c
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@ -285,36 +285,26 @@ static int controlfb_pan_display(struct fb_var_screeninfo *var,
static int controlfb_mmap(struct fb_info *info, static int controlfb_mmap(struct fb_info *info,
struct vm_area_struct *vma) struct vm_area_struct *vma)
{ {
unsigned long off, start; unsigned long mmio_pgoff;
u32 len; unsigned long start;
u32 len;
off = vma->vm_pgoff << PAGE_SHIFT; start = info->fix.smem_start;
len = info->fix.smem_len;
mmio_pgoff = PAGE_ALIGN((start & ~PAGE_MASK) + len) >> PAGE_SHIFT;
if (vma->vm_pgoff >= mmio_pgoff) {
if (info->var.accel_flags)
return -EINVAL;
vma->vm_pgoff -= mmio_pgoff;
start = info->fix.mmio_start;
len = info->fix.mmio_len;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
} else {
/* framebuffer */
vma->vm_page_prot = pgprot_cached_wthru(vma->vm_page_prot);
}
/* frame buffer memory */ return vm_iomap_memory(vma, start, len);
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)
return -EINVAL;
start = info->fix.mmio_start;
len = PAGE_ALIGN((start & ~PAGE_MASK)+info->fix.mmio_len);
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
} else {
/* framebuffer */
vma->vm_page_prot = pgprot_cached_wthru(vma->vm_page_prot);
}
start &= PAGE_MASK;
if ((vma->vm_end - vma->vm_start + off) > len)
return -EINVAL;
off += start;
vma->vm_pgoff = off >> PAGE_SHIFT;
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;
} }
static int controlfb_blank(int blank_mode, struct fb_info *info) static int controlfb_blank(int blank_mode, struct fb_info *info)