[PATCH] ALSA: hdsp: Break infinite MIDI input flush loop

[Takashi Iwai <tiwai@xxxxxxx>]

The current MIDI input flush on HDSP and HDSPM drivers relies on the
hardware reporting the right value.  If the hardware doesn't give the
proper value but returns -1, it may be stuck at an infinite loop.

Add a counter and break if the loop is unexpectedly too long.

Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
---
 sound/pci/rme9652/hdsp.c  | 6 ++++--
 sound/pci/rme9652/hdspm.c | 6 ++++--
 2 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/sound/pci/rme9652/hdsp.c b/sound/pci/rme9652/hdsp.c
index e7d1b43471a2..713ca262a0e9 100644
--- a/sound/pci/rme9652/hdsp.c
+++ b/sound/pci/rme9652/hdsp.c
@@ -1298,8 +1298,10 @@ static int snd_hdsp_midi_output_possible (struct hdsp *hdsp, int id)
 
 static void snd_hdsp_flush_midi_input (struct hdsp *hdsp, int id)
 {
-	while (snd_hdsp_midi_input_available (hdsp, id))
-		snd_hdsp_midi_read_byte (hdsp, id);
+	int count = 256;
+
+	while (snd_hdsp_midi_input_available(hdsp, id) && --count)
+		snd_hdsp_midi_read_byte(hdsp, id);
 }
 
 static int snd_hdsp_midi_output_write (struct hdsp_midi *hmidi)
diff --git a/sound/pci/rme9652/hdspm.c b/sound/pci/rme9652/hdspm.c
index 56d335f0e196..c3f930a8f78d 100644
--- a/sound/pci/rme9652/hdspm.c
+++ b/sound/pci/rme9652/hdspm.c
@@ -1838,8 +1838,10 @@ static inline int snd_hdspm_midi_output_possible (struct hdspm *hdspm, int id)
 
 static void snd_hdspm_flush_midi_input(struct hdspm *hdspm, int id)
 {
-	while (snd_hdspm_midi_input_available (hdspm, id))
-		snd_hdspm_midi_read_byte (hdspm, id);
+	int count = 256;
+
+	while (snd_hdspm_midi_input_available(hdspm, id) && --count)
+		snd_hdspm_midi_read_byte(hdspm, id);
 }
 
 static int snd_hdspm_midi_output_write (struct hdspm_midi *hmidi)
-- 
2.43.0