fbdev/controlfb: use vm_iomap_memory()
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>
diff --git a/drivers/video/controlfb.c b/drivers/video/controlfb.c
index 0c189b3..67b77b4 100644
--- a/drivers/video/controlfb.c
+++ b/drivers/video/controlfb.c
@@ -285,36 +285,26 @@
static int controlfb_mmap(struct fb_info *info,
struct vm_area_struct *vma)
{
- unsigned long off, start;
- u32 len;
+ unsigned long mmio_pgoff;
+ 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 */
- 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;
+ return vm_iomap_memory(vma, start, len);
}
static int controlfb_blank(int blank_mode, struct fb_info *info)