This is a note to let you know that I've just added the patch titled
vm: convert fb_mmap to vm_iomap_memory() helper
to the 3.0-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
vm-convert-fb_mmap-to-vm_iomap_memory-helper.patch
and it can be found in the queue-3.0 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From fc9bbca8f650e5f738af8806317c0a041a48ae4a Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Date: Fri, 19 Apr 2013 09:57:35 -0700
Subject: vm: convert fb_mmap to vm_iomap_memory() helper
From: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
commit fc9bbca8f650e5f738af8806317c0a041a48ae4a 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@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/video/fbmem.c | 40 ++++++++++++++--------------------------
1 file changed, 14 insertions(+), 26 deletions(-)
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -1350,15 +1350,12 @@ fb_mmap(struct file *file, struct vm_are
{
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;
@@ -1370,33 +1367,24 @@ fb_mmap(struct file *file, struct vm_are
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
Patches currently in stable-queue which might be from torvalds@xxxxxxxxxxxxxxxxxxxx are
queue-3.0/vm-convert-snd_pcm_lib_mmap_iomem-to-vm_iomap_memory-helper.patch
queue-3.0/hugetlbfs-add-swap-entry-check-in-follow_hugetlb_page.patch
queue-3.0/kernel-signal.c-stop-info-leak-via-the-tkill-and-the-tgkill-syscalls.patch
queue-3.0/hfsplus-fix-potential-overflow-in-hfsplus_file_truncate.patch
queue-3.0/vm-convert-fb_mmap-to-vm_iomap_memory-helper.patch
queue-3.0/vm-convert-mtdchar-mmap-to-vm_iomap_memory-helper.patch
queue-3.0/vm-convert-hpet-mmap-to-vm_iomap_memory-helper.patch
queue-3.0/vm-add-vm_iomap_memory-helper-function.patch
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