openwrt/target/linux/brcm2708/patches-4.4/0463-snd-bcm2835-Don-t-allow-responses-from-VC-to-be-inte.patch

From f491fbf4315a1d4a7210450f835a6fe93880cd5b Mon Sep 17 00:00:00 2001
From: popcornmix <popcornmix@gmail.com>
Date: Fri, 12 Aug 2016 15:46:21 +0100
Subject: [PATCH] snd-bcm2835: Don't allow responses from VC to be interrupted
 by user signals

There should always be a response, and retry after a signal interruption is not handled, so don't report
we are interruptible.

See: https://github.com/raspberrypi/linux/issues/1560
---
 sound/arm/bcm2835-vchiq.c | 25 ++++++-------------------
 1 file changed, 6 insertions(+), 19 deletions(-)

--- a/sound/arm/bcm2835-vchiq.c
+++ b/sound/arm/bcm2835-vchiq.c
@@ -511,12 +511,7 @@ static int bcm2835_audio_set_ctls_chan(b
 	}
 
 	/* We are expecting a reply from the videocore */
-	ret = wait_for_completion_interruptible(&instance->msg_avail_comp);
-	if (ret) {
-		LOG_DBG("%s: failed on waiting for event (status=%d)\n",
-			__func__, success);
-		goto unlock;
-	}
+	wait_for_completion(&instance->msg_avail_comp);
 
 	if (instance->result != 0) {
 		LOG_ERR("%s: result=%d\n", __func__, instance->result);
@@ -615,12 +610,7 @@ int bcm2835_audio_set_params(bcm2835_als
 	}
 
 	/* We are expecting a reply from the videocore */
-	ret = wait_for_completion_interruptible(&instance->msg_avail_comp);
-	if (ret) {
-		LOG_DBG("%s: failed on waiting for event (status=%d)\n",
-			__func__, success);
-		goto unlock;
-	}
+	wait_for_completion(&instance->msg_avail_comp);
 
 	if (instance->result != 0) {
 		LOG_ERR("%s: result=%d", __func__, instance->result);
@@ -761,14 +751,11 @@ int bcm2835_audio_close(bcm2835_alsa_str
 		goto unlock;
 	}
 
-	ret = wait_for_completion_interruptible(&instance->msg_avail_comp);
-	if (ret) {
-		LOG_DBG("%s: failed on waiting for event (status=%d)\n",
-			__func__, success);
-		goto unlock;
-	}
+	/* We are expecting a reply from the videocore */
+	wait_for_completion(&instance->msg_avail_comp);
+
 	if (instance->result != 0) {
-		LOG_ERR("%s: failed result (status=%d)\n",
+		LOG_ERR("%s: failed result (result=%d)\n",
 			__func__, instance->result);
 
 		ret = -1;