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authorGustavo Padovan <gustavo.padovan@collabora.co.uk>2016-08-05 16:39:38 +0300
committerSumit Semwal <sumit.semwal@linaro.org>2016-08-11 13:09:38 +0300
commite24165537312723e2900831dd6e7415b8d85278c (patch)
tree50fdfc4cbedb2b92a1a96c79141d0605ad63bf6e /include/linux/sync_file.h
parent395dec6f6bc53277bc2b034c7a232ae0c51141b7 (diff)
downloadlinux-e24165537312723e2900831dd6e7415b8d85278c.tar.xz
dma-buf/sync_file: only enable fence signalling on poll()
Signalling doesn't need to be enabled at sync_file creation, it is only required if userspace waiting the fence to signal through poll(). Thus we delay fence_add_callback() until poll is called. It only adds the callback the first time poll() is called. This avoid re-adding the same callback multiple times. v2: rebase and update to work with new fence support for sync_file v3: use atomic operation to set enabled and protect fence_add_callback() v4: use user bit from fence flags (comment from Chris Wilson) v5: use ternary if on poll return (comment from Chris Wilson) Signed-off-by: Gustavo Padovan <gustavo.padovan@collabora.co.uk> Reviewed-by: Chris Wilson <chris@chris-wilson.co.uk> Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org> [sumits: remove unused var status] Link: http://patchwork.freedesktop.org/patch/msgid/1470404378-27961-1-git-send-email-gustavo@padovan.org
Diffstat (limited to 'include/linux/sync_file.h')
-rw-r--r--include/linux/sync_file.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/sync_file.h b/include/linux/sync_file.h
index f7de5a0b3d12..aa17ccfc2f57 100644
--- a/include/linux/sync_file.h
+++ b/include/linux/sync_file.h
@@ -45,6 +45,8 @@ struct sync_file {
struct fence_cb cb;
};
+#define POLL_ENABLED FENCE_FLAG_USER_BITS
+
struct sync_file *sync_file_create(struct fence *fence);
struct fence *sync_file_get_fence(int fd);