[Qemu-devel] [PATCH 1/3] do not loop on an incomplete io_thread_fd read

[Paolo Bonzini]

No need to loop if less than a full buffer is read, the next
read would return EAGAIN.

Signed-off-by: Paolo Bonzini <address@hidden>
---
 vl.c |    4 ++--
 1 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/vl.c b/vl.c
index 6f1e1ab..46c1118 100644
--- a/vl.c
+++ b/vl.c
@@ -3210,12 +3210,12 @@ static void qemu_event_read(void *opaque)
 {
     int fd = (unsigned long)opaque;
     ssize_t len;
+    char buffer[512];
 
     /* Drain the notify pipe */
     do {
-        char buffer[512];
         len = read(fd, buffer, sizeof(buffer));
-    } while ((len == -1 && errno == EINTR) || len > 0);
+    } while ((len == -1 && errno == EINTR) || len == sizeof(buffer));
 }
 
 static int qemu_event_init(void)
-- 
1.6.6