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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