[PATCH v2 1/4] Add atomic_inc_return to atomics.

[PATCH v2 1/4] Add atomic_inc_return to atomics.

[Maarten Lankhorst]

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@ubuntu.com>
---
 xf86atomic.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/xf86atomic.h b/xf86atomic.h
index 8c4b696..17fb088 100644
--- a/xf86atomic.h
+++ b/xf86atomic.h
@@ -49,6 +49,7 @@ typedef struct {
 # define atomic_read(x) ((x)->atomic)
 # define atomic_set(x, val) ((x)->atomic = (val))
 # define atomic_inc(x) ((void) __sync_fetch_and_add (&(x)->atomic, 1))
+# define atomic_inc_return(x) (__sync_add_and_fetch (&(x)->atomic, 1))
 # define atomic_dec_and_test(x) (__sync_fetch_and_add (&(x)->atomic, -1) == 1)
 # define atomic_add(x, v) ((void) __sync_add_and_fetch(&(x)->atomic, (v)))
 # define atomic_dec(x, v) ((void) __sync_sub_and_fetch(&(x)->atomic, (v)))
@@ -68,6 +69,7 @@ typedef struct {
 # define atomic_read(x) AO_load_full(&(x)->atomic)
 # define atomic_set(x, val) AO_store_full(&(x)->atomic, (val))
 # define atomic_inc(x) ((void) AO_fetch_and_add1_full(&(x)->atomic))
+# define atomic_inc_return(x) (AO_fetch_and_add1_full(&(x)->atomic) + 1)
 # define atomic_add(x, v) ((void) AO_fetch_and_add_full(&(x)->atomic, (v)))
 # define atomic_dec(x, v) ((void) AO_fetch_and_add_full(&(x)->atomic, -(v)))
 # define atomic_dec_and_test(x) (AO_fetch_and_sub1_full(&(x)->atomic) == 1)
@@ -91,6 +93,7 @@ typedef struct { LIBDRM_ATOMIC_TYPE atomic; } atomic_t;
 # define atomic_read(x) (int) ((x)->atomic)
 # define atomic_set(x, val) ((x)->atomic = (LIBDRM_ATOMIC_TYPE)(val))
 # define atomic_inc(x) (atomic_inc_uint (&(x)->atomic))
+# define atomic_inc_return (atomic_inc_uint_nv(&(x)->atomic))
 # define atomic_dec_and_test(x) (atomic_dec_uint_nv(&(x)->atomic) == 0)
 # define atomic_add(x, v) (atomic_add_int(&(x)->atomic, (v)))
 # define atomic_dec(x, v) (atomic_add_int(&(x)->atomic, -(v)))
-- 
2.3.0

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[PATCH v2 2/4] Use __sync_add_and_fetch instead of __sync_fetch_and_add for atomic_dec_and_test

[Maarten Lankhorst]

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@ubuntu.com>
---
 xf86atomic.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xf86atomic.h b/xf86atomic.h
index 17fb088..194554c 100644
--- a/xf86atomic.h
+++ b/xf86atomic.h
@@ -50,7 +50,7 @@ typedef struct {
 # define atomic_set(x, val) ((x)->atomic = (val))
 # define atomic_inc(x) ((void) __sync_fetch_and_add (&(x)->atomic, 1))
 # define atomic_inc_return(x) (__sync_add_and_fetch (&(x)->atomic, 1))
-# define atomic_dec_and_test(x) (__sync_fetch_and_add (&(x)->atomic, -1) == 1)
+# define atomic_dec_and_test(x) (__sync_add_and_fetch (&(x)->atomic, -1) == 0)
 # define atomic_add(x, v) ((void) __sync_add_and_fetch(&(x)->atomic, (v)))
 # define atomic_dec(x, v) ((void) __sync_sub_and_fetch(&(x)->atomic, (v)))
 # define atomic_cmpxchg(x, oldv, newv) __sync_val_compare_and_swap (&(x)->atomic, oldv, newv)
-- 
2.3.0

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[PATCH v2 3/4] nouveau: make nouveau importing global buffers completely thread-safe, with tests

[Maarten Lankhorst]

While I've closed off most races in a previous patch, a small race still existed
where importing then unreffing cound cause an invalid bo. Add a test for this case.

Racing sequence fixed:

- thread 1 releases bo, refcount drops to zero, blocks on acquiring nvdev->lock.
- thread 2 increases refcount to 1.
- thread 2 decreases refcount to zero, blocks on acquiring nvdev->lock.

At this point the 2 threads will clean up the same bo.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@ubuntu.com>
Reviewed-By: Emil Velikov <emil.l.velikov@gmail.com>
---
 configure.ac              |   1 +
 nouveau/nouveau.c         |  69 ++++++++++----------
 tests/Makefile.am         |   4 ++
 tests/nouveau/.gitignore  |   1 +
 tests/nouveau/Makefile.am |  16 +++++
 tests/nouveau/threaded.c  | 156 ++++++++++++++++++++++++++++++++++++++++++++++
 6 files changed, 210 insertions(+), 37 deletions(-)
 create mode 100644 tests/nouveau/.gitignore
 create mode 100644 tests/nouveau/Makefile.am
 create mode 100644 tests/nouveau/threaded.c

diff --git a/configure.ac b/configure.ac
index 8afee83..6dc5044 100644
--- a/configure.ac
+++ b/configure.ac
@@ -441,6 +441,7 @@ AC_CONFIG_FILES([
 	tests/vbltest/Makefile
 	tests/exynos/Makefile
 	tests/tegra/Makefile
+	tests/nouveau/Makefile
 	man/Makefile
 	libdrm.pc])
 AC_OUTPUT
diff --git a/nouveau/nouveau.c b/nouveau/nouveau.c
index c6c153a..1c723b9 100644
--- a/nouveau/nouveau.c
+++ b/nouveau/nouveau.c
@@ -351,29 +351,18 @@ nouveau_bo_del(struct nouveau_bo *bo)
 
 	pthread_mutex_lock(&nvdev->lock);
 	if (nvbo->name) {
-		if (atomic_read(&nvbo->refcnt)) {
+		if (atomic_read(&nvbo->refcnt) == 0) {
+			DRMLISTDEL(&nvbo->head);
 			/*
-			 * bo has been revived by a race with
-			 * nouveau_bo_prime_handle_ref, or nouveau_bo_name_ref.
-			 *
-			 * In theory there's still a race possible with
-			 * nouveau_bo_wrap, but when using this function
-			 * the lifetime of the handle is probably already
-			 * handled in another way. If there are races
-			 * you're probably using nouveau_bo_wrap wrong.
+			 * This bo has to be closed with the lock held because
+			 * gem handles are not refcounted. If a shared bo is
+			 * closed and re-opened in another thread a race
+			 * against DRM_IOCTL_GEM_OPEN or drmPrimeFDToHandle
+			 * might cause the bo to be closed accidentally while
+			 * re-importing.
 			 */
-			pthread_mutex_unlock(&nvdev->lock);
-			return;
+			drmIoctl(bo->device->fd, DRM_IOCTL_GEM_CLOSE, &req);
 		}
-		DRMLISTDEL(&nvbo->head);
-		/*
-		 * This bo has to be closed with the lock held because gem
-		 * handles are not refcounted. If a shared bo is closed and
-		 * re-opened in another thread a race against
-		 * DRM_IOCTL_GEM_OPEN or drmPrimeFDToHandle might cause the
-		 * bo to be closed accidentally while re-importing.
-		 */
-		drmIoctl(bo->device->fd, DRM_IOCTL_GEM_CLOSE, &req);
 		pthread_mutex_unlock(&nvdev->lock);
 	} else {
 		DRMLISTDEL(&nvbo->head);
@@ -418,7 +407,7 @@ nouveau_bo_new(struct nouveau_device *dev, uint32_t flags, uint32_t align,
 
 static int
 nouveau_bo_wrap_locked(struct nouveau_device *dev, uint32_t handle,
-		       struct nouveau_bo **pbo)
+		       struct nouveau_bo **pbo, int name)
 {
 	struct nouveau_device_priv *nvdev = nouveau_device(dev);
 	struct drm_nouveau_gem_info req = { .handle = handle };
@@ -427,8 +416,24 @@ nouveau_bo_wrap_locked(struct nouveau_device *dev, uint32_t handle,
 
 	DRMLISTFOREACHENTRY(nvbo, &nvdev->bo_list, head) {
 		if (nvbo->base.handle == handle) {
-			*pbo = NULL;
-			nouveau_bo_ref(&nvbo->base, pbo);
+			if (atomic_inc_return(&nvbo->refcnt) == 1) {
+				/*
+				 * Uh oh, this bo is dead and someone else
+				 * will free it, but because refcnt is
+				 * now non-zero fortunately they won't
+				 * call the ioctl to close the bo.
+				 *
+				 * Remove this bo from the list so other
+				 * calls to nouveau_bo_wrap_locked will
+				 * see our replacement nvbo.
+				 */
+				DRMLISTDEL(&nvbo->head);
+				if (!name)
+					name = nvbo->name;
+				break;
+			}
+
+			*pbo = &nvbo->base;
 			return 0;
 		}
 	}
@@ -443,6 +448,7 @@ nouveau_bo_wrap_locked(struct nouveau_device *dev, uint32_t handle,
 		atomic_set(&nvbo->refcnt, 1);
 		nvbo->base.device = dev;
 		abi16_bo_info(&nvbo->base, &req);
+		nvbo->name = name;
 		DRMLISTADD(&nvbo->head, &nvdev->bo_list);
 		*pbo = &nvbo->base;
 		return 0;
@@ -458,7 +464,7 @@ nouveau_bo_wrap(struct nouveau_device *dev, uint32_t handle,
 	struct nouveau_device_priv *nvdev = nouveau_device(dev);
 	int ret;
 	pthread_mutex_lock(&nvdev->lock);
-	ret = nouveau_bo_wrap_locked(dev, handle, pbo);
+	ret = nouveau_bo_wrap_locked(dev, handle, pbo, 0);
 	pthread_mutex_unlock(&nvdev->lock);
 	return ret;
 }
@@ -468,24 +474,13 @@ nouveau_bo_name_ref(struct nouveau_device *dev, uint32_t name,
 		    struct nouveau_bo **pbo)
 {
 	struct nouveau_device_priv *nvdev = nouveau_device(dev);
-	struct nouveau_bo_priv *nvbo;
 	struct drm_gem_open req = { .name = name };
 	int ret;
 
 	pthread_mutex_lock(&nvdev->lock);
-	DRMLISTFOREACHENTRY(nvbo, &nvdev->bo_list, head) {
-		if (nvbo->name == name) {
-			*pbo = NULL;
-			nouveau_bo_ref(&nvbo->base, pbo);
-			pthread_mutex_unlock(&nvdev->lock);
-			return 0;
-		}
-	}
-
 	ret = drmIoctl(dev->fd, DRM_IOCTL_GEM_OPEN, &req);
 	if (ret == 0) {
-		ret = nouveau_bo_wrap_locked(dev, req.handle, pbo);
-		nouveau_bo((*pbo))->name = name;
+		ret = nouveau_bo_wrap_locked(dev, req.handle, pbo, name);
 	}
 
 	pthread_mutex_unlock(&nvdev->lock);
@@ -537,7 +532,7 @@ nouveau_bo_prime_handle_ref(struct nouveau_device *dev, int prime_fd,
 	pthread_mutex_lock(&nvdev->lock);
 	ret = drmPrimeFDToHandle(dev->fd, prime_fd, &handle);
 	if (ret == 0) {
-		ret = nouveau_bo_wrap_locked(dev, handle, bo);
+		ret = nouveau_bo_wrap_locked(dev, handle, bo, 0);
 		if (!ret) {
 			struct nouveau_bo_priv *nvbo = nouveau_bo(*bo);
 			if (!nvbo->name) {
diff --git a/tests/Makefile.am b/tests/Makefile.am
index 37b8d3a..38e4094 100644
--- a/tests/Makefile.am
+++ b/tests/Makefile.am
@@ -28,6 +28,10 @@ if HAVE_TEGRA
 SUBDIRS += tegra
 endif
 
+if HAVE_NOUVEAU
+SUBDIRS += nouveau
+endif
+
 if HAVE_LIBUDEV
 
 check_LTLIBRARIES = libdrmtest.la
diff --git a/tests/nouveau/.gitignore b/tests/nouveau/.gitignore
new file mode 100644
index 0000000..837bfb9
--- /dev/null
+++ b/tests/nouveau/.gitignore
@@ -0,0 +1 @@
+threaded
diff --git a/tests/nouveau/Makefile.am b/tests/nouveau/Makefile.am
new file mode 100644
index 0000000..c4f6e29
--- /dev/null
+++ b/tests/nouveau/Makefile.am
@@ -0,0 +1,16 @@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/include/drm \
+	-I$(top_srcdir)/nouveau \
+	-I$(top_srcdir)
+
+AM_CFLAGS = $(WARN_CFLAGS)
+
+LDADD = \
+	../../nouveau/libdrm_nouveau.la \
+	../../libdrm.la \
+	-ldl -lpthread
+
+TESTS = threaded
+
+check_PROGRAMS = $(TESTS)
+
diff --git a/tests/nouveau/threaded.c b/tests/nouveau/threaded.c
new file mode 100644
index 0000000..281af46
--- /dev/null
+++ b/tests/nouveau/threaded.c
@@ -0,0 +1,156 @@
+/*
+ * Copyright © 2015 Canonical Ltd. (Maarten Lankhorst)
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a
+ * copy of this software and associated documentation files (the "Software"),
+ * to deal in the Software without restriction, including without limitation
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,
+ * and/or sell copies of the Software, and to permit persons to whom the
+ * Software is furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
+ * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
+ * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+ * OTHER DEALINGS IN THE SOFTWARE.
+ */
+
+#ifdef HAVE_CONFIG_H
+#  include "config.h"
+#endif
+
+#include <sys/ioctl.h>
+#include <dlfcn.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <errno.h>
+#include <pthread.h>
+
+#include "xf86drm.h"
+#include "nouveau.h"
+
+static typeof(ioctl) *old_ioctl;
+static int failed;
+
+static int import_fd;
+
+int ioctl(int fd, unsigned long request, ...)
+{
+	va_list va;
+	int ret;
+	void *arg;
+
+	va_start(va, request);
+	arg = va_arg(va, void *);
+	ret = old_ioctl(fd, request, arg);
+	va_end(va);
+
+	if (ret < 0 && request == DRM_IOCTL_GEM_CLOSE && errno == EINVAL)
+		failed = 1;
+
+	return ret;
+}
+
+static void *
+openclose(void *dev)
+{
+	struct nouveau_device *nvdev = dev;
+	struct nouveau_bo *bo = NULL;
+	int i;
+
+	for (i = 0; i < 100000; ++i) {
+		if (!nouveau_bo_prime_handle_ref(nvdev, import_fd, &bo))
+			nouveau_bo_ref(NULL, &bo);
+	}
+	return NULL;
+}
+
+int main(int argc, char *argv[])
+{
+	drmVersionPtr version;
+	const char *device = NULL;
+	int err, fd, fd2;
+	struct nouveau_device *nvdev, *nvdev2;
+	struct nouveau_bo *bo;
+	pthread_t t1, t2;
+
+	old_ioctl = dlsym(RTLD_NEXT, "ioctl");
+
+	if (argc < 2) {
+		fd = drmOpenWithType("nouveau", NULL, DRM_NODE_RENDER);
+		if (fd >= 0)
+			fd2 = drmOpenWithType("nouveau", NULL, DRM_NODE_RENDER);
+	} else {
+		device = argv[1];
+
+		fd = open(device, O_RDWR);
+		if (fd >= 0)
+			fd2 = open(device, O_RDWR);
+		else
+			fd2 = fd = -errno;
+	}
+
+	if (fd < 0) {
+		fprintf(stderr, "Opening nouveau render node failed with %i\n", fd);
+		return device ? -fd : 77;
+	}
+
+	if (fd2 < 0) {
+		fprintf(stderr, "Opening second nouveau render node failed with %i\n", -errno);
+		return errno;
+	}
+
+	version = drmGetVersion(fd);
+	if (version) {
+		printf("Version: %d.%d.%d\n", version->version_major,
+		       version->version_minor, version->version_patchlevel);
+		printf("  Name: %s\n", version->name);
+		printf("  Date: %s\n", version->date);
+		printf("  Description: %s\n", version->desc);
+
+		drmFreeVersion(version);
+	}
+
+	err = nouveau_device_wrap(fd, 0, &nvdev);
+	if (!err)
+		err = nouveau_device_wrap(fd2, 0, &nvdev2);
+	if (err < 0)
+		return 1;
+
+	err = nouveau_bo_new(nvdev2, NOUVEAU_BO_GART, 0, 4096, NULL, &bo);
+	if (!err)
+		err = nouveau_bo_set_prime(bo, &import_fd);
+
+	if (!err) {
+		pthread_create(&t1, NULL, openclose, nvdev);
+		pthread_create(&t2, NULL, openclose, nvdev);
+	}
+
+	pthread_join(t1, NULL);
+	pthread_join(t2, NULL);
+
+	close(import_fd);
+	nouveau_bo_ref(NULL, &bo);
+
+	nouveau_device_del(&nvdev2);
+	nouveau_device_del(&nvdev);
+	if (device) {
+		close(fd2);
+		close(fd);
+	} else {
+		drmClose(fd2);
+		drmClose(fd);
+	}
+
+	if (failed)
+		fprintf(stderr, "DRM_IOCTL_GEM_CLOSE failed with EINVAL,\n"
+				"race in opening/closing bo is likely.\n");
+
+	return failed;
+}
-- 
2.3.0

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[PATCH v2 4/4] nouveau: Do not add most bo's to the global bo list.

[Maarten Lankhorst]

Only add wrapped bo's and bo's that have been exported through flink or dma-buf.
This avoids a lock in the common case, and decreases traversal needed for importing
a dma-buf or flink.

Signed-off-by: Maarten Lankhorst <maarten.lankhorst@ubuntu.com>
---
 nouveau/nouveau.c | 46 ++++++++++++++++++++++------------------------
 1 file changed, 22 insertions(+), 24 deletions(-)

diff --git a/nouveau/nouveau.c b/nouveau/nouveau.c
index 1c723b9..2d95b74 100644
--- a/nouveau/nouveau.c
+++ b/nouveau/nouveau.c
@@ -349,8 +349,8 @@ nouveau_bo_del(struct nouveau_bo *bo)
 	struct nouveau_bo_priv *nvbo = nouveau_bo(bo);
 	struct drm_gem_close req = { bo->handle };
 
-	pthread_mutex_lock(&nvdev->lock);
-	if (nvbo->name) {
+	if (nvbo->head.next) {
+		pthread_mutex_lock(&nvdev->lock);
 		if (atomic_read(&nvbo->refcnt) == 0) {
 			DRMLISTDEL(&nvbo->head);
 			/*
@@ -365,8 +365,6 @@ nouveau_bo_del(struct nouveau_bo *bo)
 		}
 		pthread_mutex_unlock(&nvdev->lock);
 	} else {
-		DRMLISTDEL(&nvbo->head);
-		pthread_mutex_unlock(&nvdev->lock);
 		drmIoctl(bo->device->fd, DRM_IOCTL_GEM_CLOSE, &req);
 	}
 	if (bo->map)
@@ -379,7 +377,6 @@ nouveau_bo_new(struct nouveau_device *dev, uint32_t flags, uint32_t align,
 	       uint64_t size, union nouveau_bo_config *config,
 	       struct nouveau_bo **pbo)
 {
-	struct nouveau_device_priv *nvdev = nouveau_device(dev);
 	struct nouveau_bo_priv *nvbo = calloc(1, sizeof(*nvbo));
 	struct nouveau_bo *bo = &nvbo->base;
 	int ret;
@@ -397,10 +394,6 @@ nouveau_bo_new(struct nouveau_device *dev, uint32_t flags, uint32_t align,
 		return ret;
 	}
 
-	pthread_mutex_lock(&nvdev->lock);
-	DRMLISTADD(&nvbo->head, &nvdev->bo_list);
-	pthread_mutex_unlock(&nvdev->lock);
-
 	*pbo = bo;
 	return 0;
 }
@@ -457,6 +450,18 @@ nouveau_bo_wrap_locked(struct nouveau_device *dev, uint32_t handle,
 	return -ENOMEM;
 }
 
+static void
+nouveau_bo_make_global(struct nouveau_bo_priv *nvbo)
+{
+	if (!nvbo->head.next) {
+		struct nouveau_device_priv *nvdev = nouveau_device(nvbo->base.device);
+		pthread_mutex_lock(&nvdev->lock);
+		if (!nvbo->head.next)
+			DRMLISTADD(&nvbo->head, &nvdev->bo_list);
+		pthread_mutex_unlock(&nvdev->lock);
+	}
+}
+
 drm_public int
 nouveau_bo_wrap(struct nouveau_device *dev, uint32_t handle,
 		struct nouveau_bo **pbo)
@@ -494,13 +499,16 @@ nouveau_bo_name_get(struct nouveau_bo *bo, uint32_t *name)
 	struct nouveau_bo_priv *nvbo = nouveau_bo(bo);
 
 	*name = nvbo->name;
-	if (!*name || *name == ~0U) {
+	if (!*name) {
 		int ret = drmIoctl(bo->device->fd, DRM_IOCTL_GEM_FLINK, &req);
+
 		if (ret) {
 			*name = 0;
 			return ret;
 		}
 		nvbo->name = *name = req.name;
+
+		nouveau_bo_make_global(nvbo);
 	}
 	return 0;
 }
@@ -533,16 +541,6 @@ nouveau_bo_prime_handle_ref(struct nouveau_device *dev, int prime_fd,
 	ret = drmPrimeFDToHandle(dev->fd, prime_fd, &handle);
 	if (ret == 0) {
 		ret = nouveau_bo_wrap_locked(dev, handle, bo, 0);
-		if (!ret) {
-			struct nouveau_bo_priv *nvbo = nouveau_bo(*bo);
-			if (!nvbo->name) {
-				/*
-				 * XXX: Force locked DRM_IOCTL_GEM_CLOSE
-				 * to rule out race conditions
-				 */
-				nvbo->name = ~0;
-			}
-		}
 	}
 	pthread_mutex_unlock(&nvdev->lock);
 	return ret;
@@ -557,8 +555,8 @@ nouveau_bo_set_prime(struct nouveau_bo *bo, int *prime_fd)
 	ret = drmPrimeHandleToFD(bo->device->fd, nvbo->base.handle, DRM_CLOEXEC, prime_fd);
 	if (ret)
 		return ret;
-	if (!nvbo->name)
-		nvbo->name = ~0;
+
+	nouveau_bo_make_global(nvbo);
 	return 0;
 }
 
@@ -578,8 +576,8 @@ nouveau_bo_wait(struct nouveau_bo *bo, uint32_t access,
 	if (push && push->channel)
 		nouveau_pushbuf_kick(push, push->channel);
 
-	if (!nvbo->name && !(nvbo->access & NOUVEAU_BO_WR) &&
-			   !(      access & NOUVEAU_BO_WR))
+	if (!nvbo->head.next && !(nvbo->access & NOUVEAU_BO_WR) &&
+				!(access & NOUVEAU_BO_WR))
 		return 0;
 
 	req.handle = bo->handle;
-- 
2.3.0

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Re: [Nouveau] [PATCH v2 1/4] Add atomic_inc_return to atomics.

[Emil Velikov]

On 26/02/15 10:54, Maarten Lankhorst wrote:
> Signed-off-by: Maarten Lankhorst <maarten.lankhorst@ubuntu.com>
Hmm atomic differences between the different platforms are fun. Bring on
C11 atomics :-P

But seriously, feel free to add acked-by for patches 1 & 2, and
tested-by for the whole series.

Thanks
Emil

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