[MODERATED] [PATCH v6 27/43] MDSv6

[Andi Kleen <andi@firstfloor.org>]

Add lazy_clear_cpu_interrupt() in sound core functions that are
generally associated with touching user data in interrupt handlers.
We consider all actual sound data as user data.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
---
 sound/core/pcm_lib.c | 3 +++
 sound/core/rawmidi.c | 3 +++
 sound/core/timer.c   | 3 +++
 3 files changed, 9 insertions(+)

diff --git a/sound/core/pcm_lib.c b/sound/core/pcm_lib.c
index 6c0b30391ba9..d05599a8c660 100644
--- a/sound/core/pcm_lib.c
+++ b/sound/core/pcm_lib.c
@@ -25,6 +25,7 @@
 #include <linux/time.h>
 #include <linux/math64.h>
 #include <linux/export.h>
+#include <linux/clearcpu.h>
 #include <sound/core.h>
 #include <sound/control.h>
 #include <sound/tlv.h>
@@ -1801,6 +1802,8 @@ void snd_pcm_period_elapsed(struct snd_pcm_substream *substream)
 		return;
 	runtime = substream->runtime;
 
+	lazy_clear_cpu();
+
 	snd_pcm_stream_lock_irqsave(substream, flags);
 	if (!snd_pcm_running(substream) ||
 	    snd_pcm_update_hw_ptr0(substream, 1) < 0)
diff --git a/sound/core/rawmidi.c b/sound/core/rawmidi.c
index ee601d7f0926..5edd3f0eb114 100644
--- a/sound/core/rawmidi.c
+++ b/sound/core/rawmidi.c
@@ -30,6 +30,7 @@
 #include <linux/module.h>
 #include <linux/delay.h>
 #include <linux/mm.h>
+#include <linux/clearcpu.h>
 #include <sound/rawmidi.h>
 #include <sound/info.h>
 #include <sound/control.h>
@@ -946,6 +947,7 @@ int snd_rawmidi_receive(struct snd_rawmidi_substream *substream,
 			wake_up(&runtime->sleep);
 	}
 	spin_unlock_irqrestore(&runtime->lock, flags);
+	lazy_clear_cpu();
 	return result;
 }
 EXPORT_SYMBOL(snd_rawmidi_receive);
@@ -1232,6 +1234,7 @@ int snd_rawmidi_transmit(struct snd_rawmidi_substream *substream,
 			result = __snd_rawmidi_transmit_ack(substream, count);
 	}
 	spin_unlock_irqrestore(&runtime->lock, flags);
+	lazy_clear_cpu();
 	return result;
 }
 EXPORT_SYMBOL(snd_rawmidi_transmit);
diff --git a/sound/core/timer.c b/sound/core/timer.c
index 61a0cec6e1f6..c8a39813f609 100644
--- a/sound/core/timer.c
+++ b/sound/core/timer.c
@@ -27,6 +27,7 @@
 #include <linux/device.h>
 #include <linux/module.h>
 #include <linux/string.h>
+#include <linux/clearcpu.h>
 #include <linux/sched/signal.h>
 #include <sound/core.h>
 #include <sound/timer.h>
@@ -863,6 +864,8 @@ void snd_timer_interrupt(struct snd_timer * timer, unsigned long ticks_left)
 
 	if (use_tasklet)
 		tasklet_schedule(&timer->task_queue);
+
+	lazy_clear_cpu();
 }
 EXPORT_SYMBOL(snd_timer_interrupt);
 
-- 
2.17.2