fbdev/omapfb: 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/omap2/omapfb/omapfb-main.c b/drivers/video/omap2/omapfb/omapfb-main.c
index ca585ef..717f13a 100644 (file)
--- a/drivers/video/omap2/omapfb/omapfb-main.c
+++ b/drivers/video/omap2/omapfb/omapfb-main.c
@@ -1101,41 +1101,25 @@ static int omapfb_mmap(struct fb_info *fbi, struct vm_area_struct *vma)
        struct omapfb_info *ofbi = FB2OFB(fbi);
        struct fb_fix_screeninfo *fix = &fbi->fix;
        struct omapfb2_mem_region *rg;
-       unsigned long off;
        unsigned long start;
        u32 len;
-       int r = -EINVAL;
-
-       if (vma->vm_end - vma->vm_start == 0)
-               return 0;
-       if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT))
-               return -EINVAL;
-       off = vma->vm_pgoff << PAGE_SHIFT;
+       int r;
 
        rg = omapfb_get_mem_region(ofbi->region);
 
        start = omapfb_get_region_paddr(ofbi);
        len = fix->smem_len;
-       if (off >= len)
-               goto error;
-       if ((vma->vm_end - vma->vm_start + off) > len)
-               goto error;
-
-       off += start;
 
-       DBG("user mmap region start %lx, len %d, off %lx\n", start, len, off);
+       DBG("user mmap region start %lx, len %d, off %lx\n", start, len,
+                       vma->vm_pgoff << PAGE_SHIFT);
 
-       vma->vm_pgoff = off >> PAGE_SHIFT;
-       /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
        vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
        vma->vm_ops = &mmap_user_ops;
        vma->vm_private_data = rg;
-       if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
-                              vma->vm_end - vma->vm_start,
-                              vma->vm_page_prot)) {
-               r = -EAGAIN;
+
+       r = vm_iomap_memory(vma, start, len);
+       if (r)
                goto error;
-       }
 
        /* vm_ops.open won't be called for mmap itself. */
        atomic_inc(&rg->map_count);
@@ -1144,7 +1128,7 @@ static int omapfb_mmap(struct fb_info *fbi, struct vm_area_struct *vma)
 
        return 0;
 
- error:
+error:
        omapfb_put_mem_region(ofbi->region);
 
        return r;