am7xxx: add comment about detaching kernel drivers before setting configuration

diff --git a/src/am7xxx.c b/src/am7xxx.c
index f4203e3..6595ccf 100644 (file)
--- a/src/am7xxx.c
+++ b/src/am7xxx.c
@@ -736,6 +736,15 @@ static int open_device(am7xxx_context *ctx,
        current_configuration = -1;
        libusb_get_configuration((*dev)->usb_device, &current_configuration);
        if (current_configuration != (*dev)->desc->configuration) {
        current_configuration = -1;
        libusb_get_configuration((*dev)->usb_device, &current_configuration);
        if (current_configuration != (*dev)->desc->configuration) {

+               /*
+                * In principle kernel drivers bound to each interface should
+                * be detached before setting the configuration, but in
+                * practice this is not necessary for most devices.
+                *
+                * For example something like the following function would be
+                * called:
+                *      libusb_detach_all_kernel_drivers((*dev)->usb_device);
+                */

                ret = libusb_set_configuration((*dev)->usb_device,
                                               (*dev)->desc->configuration);
                if (ret < 0) {
                ret = libusb_set_configuration((*dev)->usb_device,
                                               (*dev)->desc->configuration);
                if (ret < 0) {