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authorTakashi Iwai <tiwai@suse.de>2013-10-14 16:02:15 +0200
committerTakashi Iwai <tiwai@suse.de>2013-10-15 11:35:54 +0200
commitac536a848a1643e4b87e8fbd376a63091afc2ccc (patch)
treec21e0eaf6bb39452a1f0ec27186288dca582e72c /sound
parentccb041571b73888785ef7828a276e380125891a4 (diff)
downloadlinux-linaro-stable-ac536a848a1643e4b87e8fbd376a63091afc2ccc.tar.gz
ALSA: us122l: Fix pcm_usb_stream mmapping regression
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> Cc: <stable@vger.kernel.org> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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 d0323a693ba2..999550bbad40 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: