From: Denis Sirotkin <reg.libftdi@demitel.ru>
Date: Fri, 16 May 2014 15:40:13 +0000 (+0200)
Subject: ftdi_usb_get_strings(): Don't try to open an already open device
X-Git-Tag: v1.2rc1~19
X-Git-Url: http://developer.intra2net.com/git/?p=libftdi;a=commitdiff_plain;h=bc3841238bac9cb6955848fd661bbf19a5ed42c6

ftdi_usb_get_strings(): Don't try to open an already open device
---

diff --git a/src/ftdi.c b/src/ftdi.c
index b6caf6c..add6dc2 100644
--- a/src/ftdi.c
+++ b/src/ftdi.c
@@ -413,8 +413,8 @@ int ftdi_usb_get_strings(struct ftdi_context * ftdi, struct libusb_device * dev,
     if ((ftdi==NULL) || (dev==NULL))
         return -1;
 
-    if (libusb_open(dev, &ftdi->usb_dev) < 0)
-        ftdi_error_return(-4, "libusb_open() failed");
+    if (ftdi->usb_dev == NULL && libusb_open(dev, &ftdi->usb_dev) < 0)
+            ftdi_error_return(-4, "libusb_open() failed");
 
     if (libusb_get_device_descriptor(dev, &desc) < 0)
         ftdi_error_return(-11, "libusb_get_device_descriptor() failed");