From: Antonio Ospite <ospite@studenti.unina.it>
Date: Sat, 23 Mar 2013 21:40:25 +0000 (+0100)
Subject: am7xxx: fail if USB configuration or interface are not right
X-Git-Tag: v0.1.4~37^2~3
X-Git-Url: https://git.ao2.it/libam7xxx.git/commitdiff_plain/23ec35553ab4f1e7f1509f09d63987f2251e3873

am7xxx: fail if USB configuration or interface are not right

Check the return values of libusb_set_configuration() and
libusb_claim_interface(), this way it is easier to spot devices which
require a different setting.
---

diff --git a/src/am7xxx.c b/src/am7xxx.c
index 83d9a91..c080660 100644
--- a/src/am7xxx.c
+++ b/src/am7xxx.c
@@ -598,8 +598,28 @@ static int scan_devices(am7xxx_context *ctx, scan_op op,
 						goto out;
 					}
 
-					libusb_set_configuration((*dev)->usb_device, 2);
-					libusb_claim_interface((*dev)->usb_device, 0);
+					/* XXX, the device is now open, if any
+					 * of the calls below fail we need to
+					 * close it again before bailing out.
+					 */
+
+					ret = libusb_set_configuration((*dev)->usb_device, 2);
+					if (ret < 0) {
+						debug(ctx, "libusb_set_configuration failed\n");
+						debug(ctx, "Cannot set configuration 2\n");
+						goto out_libusb_close;
+					}
+
+					ret = libusb_claim_interface((*dev)->usb_device, 0);
+					if (ret < 0) {
+						debug(ctx, "libusb_claim_interface failed\n");
+						debug(ctx, "Cannot claim interface 0\n");
+out_libusb_close:
+						libusb_close((*dev)->usb_device);
+						(*dev)->usb_device = NULL;
+						goto out;
+					}
+
 					goto out;
 				}
 				current_index++;