Patch "ALSA: us122l: Fix pcm_usb_stream mmapping regression" has been added to the 3.11-stable tree

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This is a note to let you know that I've just added the patch titled

    ALSA: us122l: Fix pcm_usb_stream mmapping regression

to the 3.11-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:
     alsa-us122l-fix-pcm_usb_stream-mmapping-regression.patch
and it can be found in the queue-3.11 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From ac536a848a1643e4b87e8fbd376a63091afc2ccc Mon Sep 17 00:00:00 2001
From: Takashi Iwai <tiwai@xxxxxxx>
Date: Mon, 14 Oct 2013 16:02:15 +0200
Subject: ALSA: us122l: Fix pcm_usb_stream mmapping regression

From: Takashi Iwai <tiwai@xxxxxxx>

commit ac536a848a1643e4b87e8fbd376a63091afc2ccc upstream.

The pcm_usb_stream plugin requires the mremap explicitly for the read
buffer, as it expands itself once after reading the required size.
But the commit [314e51b9: mm: kill vma flag VM_RESERVED and
mm->reserved_vm counter] converted blindly to a combination of
VM_DONTEXPAND | VM_DONTDUMP like other normal drivers, and this
resulted in the failure of mremap().

For fixing this regression, we need to remove VM_DONTEXPAND for the
read-buffer mmap.

Reported-and-tested-by: James Miller <jamesstewartmiller@xxxxxxxxx>
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 sound/usb/usx2y/us122l.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

--- a/sound/usb/usx2y/us122l.c
+++ b/sound/usb/usx2y/us122l.c
@@ -262,7 +262,9 @@ static int usb_stream_hwdep_mmap(struct
 	}
 
 	area->vm_ops = &usb_stream_hwdep_vm_ops;
-	area->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
+	area->vm_flags |= VM_DONTDUMP;
+	if (!read)
+		area->vm_flags |= VM_DONTEXPAND;
 	area->vm_private_data = us122l;
 	atomic_inc(&us122l->mmap_count);
 out:


Patches currently in stable-queue which might be from tiwai@xxxxxxx are

queue-3.11/alsa-us122l-fix-pcm_usb_stream-mmapping-regression.patch
queue-3.11/alsa-hda-fix-inverted-internal-mic-not-indicated-on-some-machines.patch
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