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From 13b8b9eda753aa5bc1758627f9148e4fff91f90f Mon Sep 17 00:00:00 2001
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From: Gerd Hoffmann <kraxel@redhat.com>
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Date: Wed, 6 Nov 2013 12:17:00 +0100
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Subject: [PATCH 65/81] usb-host-libusb: Detach kernel drivers earlier
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RH-Author: Gerd Hoffmann <kraxel@redhat.com>
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Message-id: <1383740220-2049-4-git-send-email-kraxel@redhat.com>
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Patchwork-id: 55515
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O-Subject: [RHEL-7 qemu-kvm PATCH 3/3] usb-host-libusb: Detach kernel drivers earlier
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Bugzilla: 980383
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RH-Acked-by: Paolo Bonzini <pbonzini@redhat.com>
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RH-Acked-by: Bandan Das <bsd@redhat.com>
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RH-Acked-by: Alex Williamson <alex.williamson@redhat.com>
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From: Hans de Goede <hdegoede@redhat.com>
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If we detach the kernel drivers on the first set_config, then they will
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be still attached when the device gets its initial reset. Causing the drivers
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to re-initialize the device after the reset, dirtying the device state.
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Signed-off-by: Hans de Goede <hdegoede@redhat.com>
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Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
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(cherry picked from commit f34d5c750897abb3853910ce73f63d88d74dc827)
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---
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hw/usb/host-libusb.c | 7 +++++--
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1 file changed, 5 insertions(+), 2 deletions(-)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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hw/usb/host-libusb.c | 7 +++++--
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1 files changed, 5 insertions(+), 2 deletions(-)
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diff --git a/hw/usb/host-libusb.c b/hw/usb/host-libusb.c
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index 9b226e4..8510902 100644
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--- a/hw/usb/host-libusb.c
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+++ b/hw/usb/host-libusb.c
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@@ -137,6 +137,7 @@ static QTAILQ_HEAD(, USBHostDevice) hostdevs =
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static void usb_host_auto_check(void *unused);
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static void usb_host_release_interfaces(USBHostDevice *s);
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static void usb_host_nodev(USBHostDevice *s);
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+static void usb_host_detach_kernel(USBHostDevice *s);
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static void usb_host_attach_kernel(USBHostDevice *s);
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/* ------------------------------------------------------------------------ */
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@@ -787,10 +788,13 @@ static int usb_host_open(USBHostDevice *s, libusb_device *dev)
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goto fail;
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}
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- libusb_get_device_descriptor(dev, &s->ddesc);
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s->dev = dev;
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s->bus_num = bus_num;
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s->addr = addr;
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+
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+ usb_host_detach_kernel(s);
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+
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+ libusb_get_device_descriptor(dev, &s->ddesc);
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usb_host_get_port(s->dev, s->port, sizeof(s->port));
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usb_ep_init(udev);
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@@ -1051,7 +1055,6 @@ static void usb_host_set_config(USBHostDevice *s, int config, USBPacket *p)
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trace_usb_host_set_config(s->bus_num, s->addr, config);
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usb_host_release_interfaces(s);
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- usb_host_detach_kernel(s);
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rc = libusb_set_configuration(s->dh, config);
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if (rc != 0) {
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usb_host_libusb_error("libusb_set_configuration", rc);
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--
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1.7.1
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