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| author | Takashi Iwai <tiwai@suse.de> | 2013-10-14 16:02:15 +0200 |
|---|---|---|
| committer | Takashi Iwai <tiwai@suse.de> | 2013-10-15 11:35:54 +0200 |
| commit | ac536a848a1643e4b87e8fbd376a63091afc2ccc (patch) | |
| tree | c21e0eaf6bb39452a1f0ec27186288dca582e72c /sound/usb/usx2y | |
| parent | ccb041571b73888785ef7828a276e380125891a4 (diff) | |
| download | linux-ac536a848a1643e4b87e8fbd376a63091afc2ccc.tar.bz2 | |
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/usb/usx2y')
| -rw-r--r-- | sound/usb/usx2y/us122l.c | 4 |
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: |