[coreboot-gerrit] Change in em100[master]: Handle errors of libusb_bulk_transfer()

[Stefan Reinauer (Code Review)]

Stefan Reinauer has uploaded this change for review. ( https://review.coreboot.org/c/em100/+/47731 )

Change subject: Handle errors of libusb_bulk_transfer()
......................................................................

Handle errors of libusb_bulk_transfer()

Signed-off-by: Stefan Reinauer 
Change-Id: Iad1308e3bc2656506b0f485aecff8328034dc319
---
M usb.c
1 file changed, 6 insertions(+), 2 deletions(-)

git pull ssh://review.coreboot.org:29418/em100 refs/changes/31/47731/1

diff --git a/usb.c b/usb.c
index c7d52d8..4fd3df5 100644
--- a/usb.c
+++ b/usb.c
@@ -20,16 +20,20 @@
 {
    int actual;
    int length = 16; /* haven't seen any other length yet */
-	libusb_bulk_transfer(dev, 1 | LIBUSB_ENDPOINT_OUT,
+	int ret = libusb_bulk_transfer(dev, 1 | LIBUSB_ENDPOINT_OUT,
    		data, length, &actual, BULK_SEND_TIMEOUT);
+	if (LIBUSB_SUCCESS != ret)
+		printf("ERROR: USB: %s: %s\n", __func__, libusb_strerror(ret));
    return (actual == length);
 }

int get_response(libusb_device_handle *dev, void *data, int length)
 {
    int actual;
-	libusb_bulk_transfer(dev, 2 | LIBUSB_ENDPOINT_IN,
+	int ret = libusb_bulk_transfer(dev, 2 | LIBUSB_ENDPOINT_IN,
    		data, length, &actual, BULK_SEND_TIMEOUT);
+	if (LIBUSB_SUCCESS != ret)
+		printf("ERROR: USB: %s: %s\n", __func__, libusb_strerror(ret));
    return actual;
 }