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authorThierry Bultel <thierry.bultel@iot.bzh>2018-12-26 21:33:45 +0100
committerThierry Bultel <thierry.bultel@iot.bzh>2018-12-26 21:33:45 +0100
commit345df770fb7861cf5c2f55cf65559c954a1918ee (patch)
tree27d84343c120d6e6c183f09db20306e7b07f1c03 /meta-audio-4a-framework
parent17fd325e9416070c42ee61768f655435dc09aafc (diff)
bluez-alsa: Added a patch to fix the crash at PCM close
This fixes the random crash at PCM close Change-Id: I373e4b7e55d6d7d4c3be4a4a7a9f460c00758215 Signed-off-by: Thierry Bultel <thierry.bultel@iot.bzh>
Diffstat (limited to 'meta-audio-4a-framework')
-rw-r--r--meta-audio-4a-framework/recipes-connectivity/bluez-alsa/bluez-alsa/0004-Fixed-the-SIGSEGV-at-PCM-close.patch180
-rw-r--r--meta-audio-4a-framework/recipes-connectivity/bluez-alsa/bluez-alsa_git.bbappend3
2 files changed, 181 insertions, 2 deletions
diff --git a/meta-audio-4a-framework/recipes-connectivity/bluez-alsa/bluez-alsa/0004-Fixed-the-SIGSEGV-at-PCM-close.patch b/meta-audio-4a-framework/recipes-connectivity/bluez-alsa/bluez-alsa/0004-Fixed-the-SIGSEGV-at-PCM-close.patch
new file mode 100644
index 00000000..52dbf773
--- /dev/null
+++ b/meta-audio-4a-framework/recipes-connectivity/bluez-alsa/bluez-alsa/0004-Fixed-the-SIGSEGV-at-PCM-close.patch
@@ -0,0 +1,180 @@
+From 23a1f554565c0cb9fade1a8f86ab9a09bf3d04e7 Mon Sep 17 00:00:00 2001
+From: Thierry Bultel <thierry.bultel@iot.bzh>
+Date: Wed, 26 Dec 2018 10:06:38 +0100
+Subject: [PATCH] Fixed the SIGSEGV at PCM close
+
+There is a (still not identified) race condition at PCM
+close, producing a SIGSEGV when pthread_cancel is called.
+Instead of proposing a trick with pthread_setcancelstate,
+this fix introduces a cancellation pipe, on which the io_thread
+polls. This guaranties a better, safer, exit path.
+
+Signed-off-by: Thierry Bultel <thierry.bultel@iot.bzh>
+---
+ src/asound/bluealsa-pcm.c | 82 +++++++++++++++++++++++++++++++++++++++++------
+ 1 file changed, 72 insertions(+), 10 deletions(-)
+
+diff --git a/src/asound/bluealsa-pcm.c b/src/asound/bluealsa-pcm.c
+index 2136964..013aebb 100644
+--- a/src/asound/bluealsa-pcm.c
++++ b/src/asound/bluealsa-pcm.c
+@@ -67,6 +67,8 @@ struct bluealsa_pcm {
+ snd_pcm_uframes_t io_hw_boundary;
+ snd_pcm_uframes_t io_hw_ptr;
+
++ int cancelPipe[2];
++
+ };
+
+
+@@ -107,7 +109,9 @@ static void *io_thread(void *arg) {
+ struct asrsync asrs;
+ asrsync_init(&asrs, io->rate);
+
+- debug("Starting IO loop");
++ const char * type = io->stream== SND_PCM_STREAM_CAPTURE?"CAPTURE":"PLAYBACK";
++
++ debug("------------ Starting IO loop (%s)-----------------------", type);
+ for (;;) {
+
+ int tmp;
+@@ -124,6 +128,11 @@ static void *io_thread(void *arg) {
+ debug("IO thread resumed: %d", io->state);
+ }
+
++ if (pcm->io_started == false) {
++ debug("io_thread not started -> exit");
++ goto final;
++ }
++
+ snd_pcm_uframes_t io_ptr = pcm->io_ptr;
+ snd_pcm_uframes_t io_buffer_size = io->buffer_size;
+ snd_pcm_uframes_t io_hw_ptr = pcm->io_hw_ptr;
+@@ -152,21 +161,44 @@ static void *io_thread(void *arg) {
+ if (io_hw_ptr >= io_hw_boundary)
+ io_hw_ptr -= io_hw_boundary;
+
++ struct pollfd fds[2];
++
++ fds[0].fd = pcm->pcm_fd;
++ fds[1].fd = pcm->cancelPipe[0];
++
++ if (io->stream == SND_PCM_STREAM_CAPTURE)
++ fds[0].events |= POLLIN;
++ else
++ fds[0].events |= POLLOUT;
++
++ fds[1].events = POLLIN | POLLHUP;
++
+ if (io->stream == SND_PCM_STREAM_CAPTURE) {
+
+ /* Read the whole period "atomically". This will assure, that frames
+ * are not fragmented, so the pointer can be correctly updated. */
+- while (len != 0 && (ret = read(pcm->pcm_fd, head, len)) != 0) {
++ while (len != 0 &&
++ pcm->io_started) {
++
++ int pollres = poll(fds, 2, -1);
++
++ if ((fds[1].revents & POLLIN) != 0) {
++ debug("io_thread: CANCELLED");
++ goto final;
++ }
++
++ ret = read(pcm->pcm_fd, head, len);
+ if (ret == -1) {
+- if (errno == EINTR)
+- continue;
++ if (errno == EINTR) {
++ break;
++ }
+ SNDERR("PCM FIFO read error: %s", strerror(errno));
+ goto final;
+ }
+ head += ret;
+ len -= ret;
+- }
+
++ }
+ if (ret == 0)
+ goto final;
+
+@@ -182,9 +214,18 @@ static void *io_thread(void *arg) {
+
+ /* Perform atomic write - see the explanation above. */
+ do {
++
++ int pollres = poll(fds, 2, -1);
++
++ if ((fds[1].revents & POLLIN) != 0) {
++ debug("io_thread: CANCELLED");
++ goto final;
++ }
++
+ if ((ret = write(pcm->pcm_fd, head, len)) == -1) {
+- if (errno == EINTR)
+- continue;
++ if (errno == EINTR) {
++ break;
++ }
+ SNDERR("PCM FIFO write error: %s", strerror(errno));
+ goto final;
+ }
+@@ -251,12 +292,24 @@ static int bluealsa_start(snd_pcm_ioplug_t *io) {
+
+ static int bluealsa_stop(snd_pcm_ioplug_t *io) {
+ struct bluealsa_pcm *pcm = io->private_data;
+- debug("Stopping");
++ debug("Stopping %p", pcm);
++ if (!pcm) {
++ debug("PCM ALREADY CLOSED !");
++ return 0;
++ }
+ if (pcm->io_started) {
+ pcm->io_started = false;
+- pthread_cancel(pcm->io_thread);
++
++ char dummy = 0;
++
++ if (write(pcm->cancelPipe[1], &dummy, sizeof(dummy)) < 0)
++ debug("Failed to write to the cancellation pipe");
++
+ pthread_join(pcm->io_thread, NULL);
+ }
++done:
++ debug("Stop done");
++
+ return 0;
+ }
+
+@@ -269,10 +322,14 @@ static snd_pcm_sframes_t bluealsa_pointer(snd_pcm_ioplug_t *io) {
+
+ static int bluealsa_close(snd_pcm_ioplug_t *io) {
+ struct bluealsa_pcm *pcm = io->private_data;
+- debug("Closing plugin");
++ debug("Closing plugin %p", pcm);
+ close(pcm->fd);
+ close(pcm->event_fd);
++ close(pcm->cancelPipe[0]);
++ close(pcm->cancelPipe[1]);
+ free(pcm);
++ io->private_data = NULL;
++ debug("PCM closed");
+ return 0;
+ }
+
+@@ -649,6 +706,11 @@ SND_PCM_PLUGIN_DEFINE_FUNC(bluealsa) {
+ pcm->pcm_fd = -1;
+ pcm->delay_ex = delay;
+
++ if (pipe(pcm->cancelPipe) == -1) {
++ SNDERR("BlueALSA failed to create cancellation pipe: %s", strerror(errno));
++ ret = -errno;
++ }
++
+ if ((pcm->fd = bluealsa_open(interface)) == -1) {
+ SNDERR("BlueALSA connection failed: %s", strerror(errno));
+ ret = -errno;
+--
+2.16.4
+
diff --git a/meta-audio-4a-framework/recipes-connectivity/bluez-alsa/bluez-alsa_git.bbappend b/meta-audio-4a-framework/recipes-connectivity/bluez-alsa/bluez-alsa_git.bbappend
index 43e4632f..8c67037f 100644
--- a/meta-audio-4a-framework/recipes-connectivity/bluez-alsa/bluez-alsa_git.bbappend
+++ b/meta-audio-4a-framework/recipes-connectivity/bluez-alsa/bluez-alsa_git.bbappend
@@ -7,5 +7,4 @@ FILESEXTRAPATHS_prepend := "${THISDIR}/${PN}:"
SRC_URI += "file://0001-build-and-link-with-a-shared-library.patch"
SRC_URI += "file://0002-log-add-calling-function-name.patch"
SRC_URI += "file://0003-increased-the-number-of-connexions-to-16.patch"
-
-
+SRC_URI += "file://0004-Fixed-the-SIGSEGV-at-PCM-close.patch"