[ 3.5.y.z extended stable ] Patch "vm: convert HPET mmap to vm_iomap_memory() helper" has been added to staging queue

[Luis Henriques]

This is a note to let you know that I have just added a patch titled

    vm: convert HPET mmap to vm_iomap_memory() helper

to the linux-3.5.y-queue branch of the 3.5.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.5.y-queue

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.5.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Luis

------

>From 4df209ae1d46c05743616cc504b9b0a2d2cb9317 Mon Sep 17 00:00:00 2001
From: Linus Torvalds <torvalds at linux-foundation.org>
Date: Fri, 19 Apr 2013 09:46:39 -0700
Subject: [PATCH] vm: convert HPET mmap to vm_iomap_memory() helper

commit 2323036dfec8ce3ce6e1c86a49a31b039f3300d1 upstream.

This is my example conversion of a few existing mmap users.  The HPET
case is simple, widely available, and easy to test (Clemens Ladisch sent
a trivial test-program for it).

Test-program-by: Clemens Ladisch <clemens at ladisch.de>
Signed-off-by: Linus Torvalds <torvalds at linux-foundation.org>
Signed-off-by: Luis Henriques <luis.henriques at canonical.com>
---
 drivers/char/hpet.c | 14 +-------------
 1 file changed, 1 insertion(+), 13 deletions(-)

diff --git a/drivers/char/hpet.c b/drivers/char/hpet.c
index dfd7876..0ff5c2e 100644
--- a/drivers/char/hpet.c
+++ b/drivers/char/hpet.c
@@ -373,26 +373,14 @@ static int hpet_mmap(struct file *file, struct vm_area_struct *vma)
 	struct hpet_dev *devp;
 	unsigned long addr;

-	if (((vma->vm_end - vma->vm_start) != PAGE_SIZE) || vma->vm_pgoff)
-		return -EINVAL;
-
 	devp = file->private_data;
 	addr = devp->hd_hpets->hp_hpet_phys;

 	if (addr & (PAGE_SIZE - 1))
 		return -ENOSYS;

-	vma->vm_flags |= VM_IO;
 	vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
-
-	if (io_remap_pfn_range(vma, vma->vm_start, addr >> PAGE_SHIFT,
-					PAGE_SIZE, vma->vm_page_prot)) {
-		printk(KERN_ERR "%s: io_remap_pfn_range failed\n",
-			__func__);
-		return -EAGAIN;
-	}
-
-	return 0;
+	return vm_iomap_memory(vma, addr, PAGE_SIZE);
 #else
 	return -ENOSYS;
 #endif
--
1.8.1.2