|
 |
218e99 |
From d8c698663916222fea36f660f0e56a23a8688afc Mon Sep 17 00:00:00 2001
|
|
|
218e99 |
From: Gerd Hoffmann <kraxel@redhat.com>
|
|
|
218e99 |
Date: Wed, 6 Nov 2013 12:16:58 +0100
|
|
|
218e99 |
Subject: [PATCH 63/81] usb-host-libusb: Fix reset handling
|
|
|
218e99 |
|
|
|
218e99 |
RH-Author: Gerd Hoffmann <kraxel@redhat.com>
|
|
|
218e99 |
Message-id: <1383740220-2049-2-git-send-email-kraxel@redhat.com>
|
|
|
218e99 |
Patchwork-id: 55513
|
|
|
218e99 |
O-Subject: [RHEL-7 qemu-kvm PATCH 1/3] usb-host-libusb: Fix reset handling
|
|
|
218e99 |
Bugzilla: 980415
|
|
|
218e99 |
RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
|
|
|
218e99 |
RH-Acked-by: Bandan Das <bsd@redhat.com>
|
|
|
218e99 |
RH-Acked-by: Alex Williamson <alex.williamson@redhat.com>
|
|
|
218e99 |
|
|
|
218e99 |
From: Hans de Goede <hdegoede@redhat.com>
|
|
|
218e99 |
|
|
|
218e99 |
The guest will issue an initial device reset when the device is attached, but
|
|
|
218e99 |
since the current usb-host-libusb code only actually does the reset when
|
|
|
218e99 |
udev->configuration != 0, and on attach the device is not yet configured,
|
|
|
218e99 |
the reset gets ignored. This means that the device gets passed to the guest
|
|
|
218e99 |
in an unknown state, which is not good.
|
|
|
218e99 |
|
|
|
218e99 |
The udev->configuration check is there because of the release / claim
|
|
|
218e99 |
interfaces done around the libusb_device_reset call, but these are not
|
|
|
218e99 |
necessary. If interfaces are claimed when libusb_device_reset gets called
|
|
|
218e99 |
libusb will release + reclaim them itself.
|
|
|
218e99 |
|
|
|
218e99 |
The usb_host_ep_update call also is not necessary. If the reset succeeds the
|
|
|
218e99 |
original config and interface alt settings will be restored.
|
|
|
218e99 |
|
|
|
218e99 |
Last if the reset fails, that means the device has either disconnected or
|
|
|
218e99 |
morphed into an another device and has been completely re-enumerated,
|
|
|
218e99 |
so it is treated by the host as a new device and our handle is invalid,
|
|
|
218e99 |
so on reset failure we need to call usb_host_nodev().
|
|
|
218e99 |
|
|
|
218e99 |
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
|
|
|
218e99 |
Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
|
|
|
218e99 |
(cherry picked from commit 5af35d7feccaa7d26b72c6c3d14116421d736b36)
|
|
|
218e99 |
---
|
|
|
218e99 |
hw/usb/host-libusb.c | 10 ++++------
|
|
|
218e99 |
1 file changed, 4 insertions(+), 6 deletions(-)
|
|
|
218e99 |
|
|
|
218e99 |
Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
|
|
|
218e99 |
---
|
|
|
218e99 |
hw/usb/host-libusb.c | 10 ++++------
|
|
|
218e99 |
1 files changed, 4 insertions(+), 6 deletions(-)
|
|
|
218e99 |
|
|
|
218e99 |
diff --git a/hw/usb/host-libusb.c b/hw/usb/host-libusb.c
|
|
|
218e99 |
index f660770..9c8905e 100644
|
|
|
218e99 |
--- a/hw/usb/host-libusb.c
|
|
|
218e99 |
+++ b/hw/usb/host-libusb.c
|
|
|
218e99 |
@@ -1256,16 +1256,14 @@ static void usb_host_flush_ep_queue(USBDevice *dev, USBEndpoint *ep)
|
|
|
218e99 |
static void usb_host_handle_reset(USBDevice *udev)
|
|
|
218e99 |
{
|
|
|
218e99 |
USBHostDevice *s = USB_HOST_DEVICE(udev);
|
|
|
218e99 |
+ int rc;
|
|
|
218e99 |
|
|
|
218e99 |
trace_usb_host_reset(s->bus_num, s->addr);
|
|
|
218e99 |
|
|
|
218e99 |
- if (udev->configuration == 0) {
|
|
|
218e99 |
- return;
|
|
|
218e99 |
+ rc = libusb_reset_device(s->dh);
|
|
|
218e99 |
+ if (rc != 0) {
|
|
|
218e99 |
+ usb_host_nodev(s);
|
|
|
218e99 |
}
|
|
|
218e99 |
- usb_host_release_interfaces(s);
|
|
|
218e99 |
- libusb_reset_device(s->dh);
|
|
|
218e99 |
- usb_host_claim_interfaces(s, 0);
|
|
|
218e99 |
- usb_host_ep_update(s);
|
|
|
218e99 |
}
|
|
|
218e99 |
|
|
|
218e99 |
/*
|
|
|
218e99 |
--
|
|
|
218e99 |
1.7.1
|
|
|
218e99 |
|