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