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authorTakashi Iwai <tiwai@suse.de>2013-10-14 16:02:15 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-11-04 04:31:06 -0800
commit1f931f65de9d04daf024eeb4dd6a8fe93b7a8e91 (patch)
tree5459f52deba026588dd75f9ffb3280d264f50240 /sound
parent7ed008638ee15991b79d8867d382e141fee89a69 (diff)
downloadvexpress-lsk-1f931f65de9d04daf024eeb4dd6a8fe93b7a8e91.tar.gz
ALSA: us122l: Fix pcm_usb_stream mmapping regression
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@gmail.com> Signed-off-by: Takashi Iwai <tiwai@suse.de> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'sound')
-rw-r--r--sound/usb/usx2y/us122l.c4
1 files changed, 3 insertions, 1 deletions
diff --git a/sound/usb/usx2y/us122l.c b/sound/usb/usx2y/us122l.c
index d0323a693ba..999550bbad4 100644
--- a/sound/usb/usx2y/us122l.c
+++ b/sound/usb/usx2y/us122l.c
@@ -262,7 +262,9 @@ static int usb_stream_hwdep_mmap(struct snd_hwdep *hw,
}
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: