[Qemu-block] [PATCH] aio-posix: fill error message that is missed

[Cao jin]

The current judegement of caller is meaningless, make it useful.

Signed-off-by: Cao jin <address@hidden>
---
 aio-posix.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/aio-posix.c b/aio-posix.c
index 6006122..8b0deb7 100644
--- a/aio-posix.c
+++ b/aio-posix.c
@@ -18,6 +18,7 @@
 #include "block/block.h"
 #include "qemu/queue.h"
 #include "qemu/sockets.h"
+#include "qapi/error.h"
 #ifdef CONFIG_EPOLL_CREATE1
 #include <sys/epoll.h>
 #endif
@@ -491,6 +492,7 @@ void aio_context_setup(AioContext *ctx, Error **errp)
     assert(!ctx->epollfd);
     ctx->epollfd = epoll_create1(EPOLL_CLOEXEC);
     if (ctx->epollfd == -1) {
+        error_setg_errno(errp, errno, "Failed to create epoll instance");
         ctx->epoll_available = false;
     } else {
         ctx->epoll_available = true;
-- 
2.1.0