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From 9cf0574418cc7657618a738dd31337739c635875 Mon Sep 17 00:00:00 2001
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From: Mark McLoughlin <markmc@redhat.com>
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Date: Fri, 3 Jul 2009 09:17:20 +0100
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Subject: [PATCH] Prefer sysfs for USB host devices
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Scanning for devices via /sys/bus/usb/devices/ and using them via the
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/dev/bus/usb/<bus>/<device> character devices is the prefered method
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on modern kernels, so try that first.
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When using SELinux and libvirt, qemu will have access to /sys/bus/usb
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but not /proc/bus/usb, so although the current code will work just
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fine, it will generate SELinux AVC warnings.
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See also:
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https://bugzilla.redhat.com/508326
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Reported-by: Daniel Berrange <berrange@redhat.com>
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Signed-off-by: Mark McLoughlin <markmc@redhat.com>
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---
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usb-linux.c | 18 +++++++++---------
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1 files changed, 9 insertions(+), 9 deletions(-)
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diff --git a/usb-linux.c b/usb-linux.c
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index 67e4acd..3c724ba 100644
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--- a/usb-linux.c
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+++ b/usb-linux.c
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@@ -1265,6 +1265,15 @@ static int usb_host_scan(void *opaque, USBScanFunc *func)
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/* only check the host once */
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if (!usb_fs_type) {
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+ dir = opendir(USBSYSBUS_PATH "/devices");
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+ if (dir) {
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+ /* devices found in /dev/bus/usb/ (yes - not a mistake!) */
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+ strcpy(devpath, USBDEVBUS_PATH);
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+ usb_fs_type = USB_FS_SYS;
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+ closedir(dir);
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+ dprintf(USBDBG_DEVOPENED, USBSYSBUS_PATH);
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+ goto found_devices;
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+ }
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f = fopen(USBPROCBUS_PATH "/devices", "r");
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if (f) {
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/* devices found in /proc/bus/usb/ */
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@@ -1284,15 +1293,6 @@ static int usb_host_scan(void *opaque, USBScanFunc *func)
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dprintf(USBDBG_DEVOPENED, USBDEVBUS_PATH);
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goto found_devices;
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}
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- dir = opendir(USBSYSBUS_PATH "/devices");
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- if (dir) {
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- /* devices found in /dev/bus/usb/ (yes - not a mistake!) */
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- strcpy(devpath, USBDEVBUS_PATH);
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- usb_fs_type = USB_FS_SYS;
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- closedir(dir);
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- dprintf(USBDBG_DEVOPENED, USBSYSBUS_PATH);
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- goto found_devices;
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- }
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found_devices:
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if (!usb_fs_type) {
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monitor_printf(mon, "husb: unable to access USB devices\n");
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--
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1.6.2.5
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