3.2.53-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
commit 7314e613d5ff9f0934f7a0f74ed7973b903315d1 upstream.
Nico Golde reports a few straggling uses of [io_]remap_pfn_range() that
really should use the vm_iomap_memory() helper. This trivially converts
two of them to the helper, and comments about why the third one really
needs to continue to use remap_pfn_range(), and adds the missing size
check.
Reported-by: Nico Golde <nico@xxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx.
[bwh: Backported to 3.2:
- Adjust context
- Also remove redundant vm_flags changes, removed separately upstream]
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
--- a/drivers/uio/uio.c
+++ b/drivers/uio/uio.c
@@ -650,16 +650,28 @@ static int uio_mmap_physical(struct vm_a
{
struct uio_device *idev = vma->vm_private_data;
int mi = uio_find_mem_index(vma);
+ struct uio_mem *mem;
if (mi < 0)
return -EINVAL;
+ mem = idev->info->mem + mi;
- vma->vm_flags |= VM_IO | VM_RESERVED;
+ if (vma->vm_end - vma->vm_start > mem->size)
+ return -EINVAL;
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
+ /*
+ * We cannot use the vm_iomap_memory() helper here,
+ * because vma->vm_pgoff is the map index we looked
+ * up above in uio_find_mem_index(), rather than an
+ * actual page offset into the mmap.
+ *
+ * So we just do the physical mmap without a page
+ * offset.
+ */
return remap_pfn_range(vma,
vma->vm_start,
- idev->info->mem[mi].addr >> PAGE_SHIFT,
+ mem->addr >> PAGE_SHIFT,
vma->vm_end - vma->vm_start,
vma->vm_page_prot);
}
--- a/drivers/video/au1100fb.c
+++ b/drivers/video/au1100fb.c
@@ -387,39 +387,13 @@ void au1100fb_fb_rotate(struct fb_info *
int au1100fb_fb_mmap(struct fb_info *fbi, struct vm_area_struct *vma)
{
struct au1100fb_device *fbdev;
- unsigned int len;
- unsigned long start=0, off;
fbdev = to_au1100fb_device(fbi);
- if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) {
- return -EINVAL;
- }
-
- start = fbdev->fb_phys & PAGE_MASK;
- len = PAGE_ALIGN((start & ~PAGE_MASK) + fbdev->fb_len);
-
- off = vma->vm_pgoff << PAGE_SHIFT;
-
- if ((vma->vm_end - vma->vm_start + off) > len) {
- return -EINVAL;
- }
-
- off += start;
- vma->vm_pgoff = off >> PAGE_SHIFT;
-
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
pgprot_val(vma->vm_page_prot) |= (6 << 9); //CCA=6
- vma->vm_flags |= VM_IO;
-
- 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, fbdev->fb_phys, fbdev->fb_len);
}
static struct fb_ops au1100fb_ops =
--- a/drivers/video/au1200fb.c
+++ b/drivers/video/au1200fb.c
@@ -1216,38 +1216,13 @@ static int au1200fb_fb_blank(int blank_m
* method mainly to allow the use of the TLB streaming flag (CCA=6)
*/
static int au1200fb_fb_mmap(struct fb_info *info, struct vm_area_struct *vma)
-
{
- unsigned int len;
- unsigned long start=0, off;
struct au1200fb_device *fbdev = info->par;
- if (vma->vm_pgoff > (~0UL >> PAGE_SHIFT)) {
- return -EINVAL;
- }
-
- start = fbdev->fb_phys & PAGE_MASK;
- len = PAGE_ALIGN((start & ~PAGE_MASK) + fbdev->fb_len);
-
- off = vma->vm_pgoff << PAGE_SHIFT;
-
- if ((vma->vm_end - vma->vm_start + off) > len) {
- return -EINVAL;
- }
-
- off += start;
- vma->vm_pgoff = off >> PAGE_SHIFT;
-
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
pgprot_val(vma->vm_page_prot) |= _CACHE_MASK; /* CCA=7 */
- vma->vm_flags |= VM_IO;
-
- return io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
- vma->vm_end - vma->vm_start,
- vma->vm_page_prot);
-
- return 0;
+ return vm_iomap_memory(vma, fbdev->fb_phys, fbdev->fb_len);
}
static void set_global(u_int cmd, struct au1200_lcd_global_regs_t *pdata)
--
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