copybit: Initialize release & acquire fence fds of Copybit context.

Initialize release and acquire fence fds of Copybit context to -1.
Otherwise fd 0 gets closed in first call to msm_copybit, which is
valid fd and it leads to bad state if fd 0 is being used as stdin.

Change-Id: I01278bbb580d61e2d4b4c7b3f7b346274af6d914

1 files changed, 4 insertions, 0 deletions

diff --git a/libcopybit/copybit.cpp b/libcopybit/copybit.cpp
index 5d8da05d..47d9b937 100644
--- a/libcopybit/copybit.cpp
+++ b/libcopybit/copybit.cpp
@@ -714,6 +714,10 @@ static int open_copybit(const struct hw_module_t* module, const char* name,
     ctx->mAlpha = MDP_ALPHA_NOP;
     ctx->mFlags = 0;
     ctx->sync.flags = 0;
+    ctx->relFence = -1;
+    for (int i=0; i < MDP_MAX_FENCE_FD; i++) {
+        ctx->acqFence[i] = -1;
+    }
     ctx->sync.acq_fen_fd = ctx->acqFence;
     ctx->sync.rel_fen_fd = &ctx->relFence;
     ctx->list.count = 0;