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libusb: warn once and freeze when device vanishs

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Instead of repeatedly printing error messages when a device is not
available anymore, print an error once and then sleep forever.
There is no dynamic behaviour with respect to device availability
implemented in the libusb yet. Instead, you can manage libusb
components externally.

Ref genodelabs/genode#5401
This commit is contained in:
Stefan Kalkowski 2024-12-10 12:36:44 +01:00 committed by Christian Helmuth
parent ebb159d32d
commit d3002b26ac
1 changed files with 11 additions and 0 deletions
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11
repos/libports/src/lib/libusb/genode_usb_raw.cc
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@ -17,6 +17,7 @@
#include <base/allocator_avl.h>
#include <base/signal.h>
#include <base/tslab.h>
#include <base/sleep.h>
#include <usb_session/device.h>
#include <fcntl.h>
@ -168,6 +169,11 @@ void Usb_device::Interface::handle_events()
/* complete USB request */
[this] (Urb &urb, Usb::Tagged_packet::Return_value v)
{
if (v == Usb::Tagged_packet::NO_DEVICE) {
error("USB device has vanished, will freeze!");
sleep_forever();
}
if (v != Usb::Tagged_packet::OK)
error("transfer failed, return value ", (int)v);
@ -218,6 +224,11 @@ void Usb_device::handle_events()
/* complete USB request */
[this] (Urb &urb, Usb::Tagged_packet::Return_value v)
{
if (v == Usb::Tagged_packet::NO_DEVICE) {
error("USB device has vanished, will freeze!");
sleep_forever();
}
if (v != Usb::Tagged_packet::OK)
error("control transfer failed, return value ", (int)v);