ALSA: hdspm - Fix locking in snd_hdspm_midi_input_read

For the MIDI part, we need to acquire (and release) the hmidi->lock,
access to the global hdspm structure is serialized through
hmidi->hdspm->lock instead.

Signed-off-by: Adrian Knoth <adi@drcomp.erfurt.thur.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>

1 files changed, 3 insertions, 1 deletions

diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
index 949691a876d3..32d80af012cc 100644
--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -1639,12 +1639,14 @@ static int snd_hdspm_midi_input_read (struct hdspm_midi *hmidi)
                 }
         }
         hmidi->pending = 0;
+        spin_unlock_irqrestore(&hmidi->lock, flags);
 
+        spin_lock_irqsave(&hmidi->hdspm->lock, flags);
         hmidi->hdspm->control_register |= hmidi->ie;
         hdspm_write(hmidi->hdspm, HDSPM_controlRegister,
                     hmidi->hdspm->control_register);
+        spin_unlock_irqrestore(&hmidi->hdspm->lock, flags);
 
-        spin_unlock_irqrestore (&hmidi->lock, flags);
         return snd_hdspm_midi_output_write (hmidi);
 }