From bb50295e5efabf3f8dcbee1102bf3856343f04d9 Mon Sep 17 00:00:00 2001
From: Dan Williams <dcbw@redhat.com>
Date: Thu, 25 Jun 2009 14:14:10 -0400
Subject: serial-port: if 0 bytes are read, just return

Otherwise, if something else is mistakenly holding the serial port open at
the same time as this MMSerialPort, you get a stream of reads of size 0 and
effectively hang modem-manager.
---
 src/mm-serial-port.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'src')

diff --git a/src/mm-serial-port.c b/src/mm-serial-port.c
index ac5d1d32..357fc947 100644
--- a/src/mm-serial-port.c
+++ b/src/mm-serial-port.c
@@ -620,6 +620,10 @@ data_available (GIOChannel *source,
             err = NULL;
         }
 
+        /* If no bytes read, just let g_io_channel wait for more data */
+        if (bytes_read == 0)
+            break;
+
         if (bytes_read > 0) {
             serial_debug (self, "<--", buf, bytes_read);
             g_string_append_len (priv->response, buf, bytes_read);
-- 
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