On 05/03/2012 03:21 PM, Eric Blake wrote:
> On 05/03/2012 04:51 AM, Guannan Ren wrote:
>> usbFindDevice():get usb device according to
>> idVendor, idProduct, bus, device
>> it is the exact match of the four parameters
>>
>> usbFindDeviceByBus():get usb device according to bus, device
>> it returns only one usb device same as usbFindDevice
>>
>> usbFindDeviceByVendor():get usb device according to idVendor,idProduct
>> it probably returns multiple usb devices.
>>
>> usbDeviceSearch(): a helper function to do the actual search
>> ---
>> src/libvirt_private.syms | 2 +
>> src/util/hostusb.c | 209 +++++++++++++++++++++++++++++++++-------------
>> src/util/hostusb.h | 22 ++++--
>> 3 files changed, 170 insertions(+), 63 deletions(-)
This patch doesn't even compile!
qemu/qemu_hostdev.c: In function 'qemuPrepareHostdevUSBDevices':
qemu/qemu_hostdev.c:599:33: error: too few arguments to function
'usbFindDevice'
../src/util/hostusb.h:40:13: note: declared here
You can't change the signature of usbFindDevice unless you update all
callers in the same patch.
By the way, here are some suggestions I have for your patch:
diff --git i/src/util/hostusb.c w/src/util/hostusb.c
index cad0a6c..533b9c7 100644
--- i/src/util/hostusb.c
+++ w/src/util/hostusb.c
@@ -1,5 +1,5 @@
/*
- * Copyright (C) 2009-2011 Red Hat, Inc.
+ * Copyright (C) 2009-2012 Red Hat, Inc.
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
@@ -65,9 +65,10 @@ struct _usbDeviceList {
};
typedef enum {
- USB_DEVICE_ALL = 0,
- USB_DEVICE_FIND_BY_VENDOR = 1,
- USB_DEVICE_FIND_BY_BUS = 2,
+ USB_DEVICE_ALL = 0, /* no filtering */
+ USB_DEVICE_FIND_BY_VENDOR = 1 << 0, /* filter to vendor matches */
+ USB_DEVICE_FIND_BY_BUS = 1 << 1, /* filter to bus matches */
+ USB_DEVICE_FIND_ONE = 1 << 2, /* filter to first match */
} usbDeviceFindFlags;
static int usbSysReadFile(const char *f_name, const char *d_name,
@@ -108,7 +109,6 @@ usbDeviceSearch(unsigned int vendor,
unsigned int flags)
{
DIR *dir = NULL;
- bool found = false;
char *ignore = NULL;
struct dirent *de;
usbDeviceList *list = NULL, *ret = NULL;
@@ -154,29 +154,13 @@ usbDeviceSearch(unsigned int vendor,
10, &found_devno) < 0)
goto cleanup;
- /*
- * Don't set found to true in order to continue the loop
- * to find multiple USB devices with same idVendor and idProduct
- */
- if (flags && !(flags & ~USB_DEVICE_FIND_BY_VENDOR))
- if (found_prod != product || found_vend != vendor)
- continue;
-
- if (flags && !(flags & ~USB_DEVICE_FIND_BY_BUS)) {
- if (found_bus != bus || found_devno != devno)
- continue;
- found = true;
- }
+ if ((flags & USB_DEVICE_FIND_BY_VENDOR) &&
+ (found_prod != product || found_vend != vendor))
+ continue;
- if ((flags & USB_DEVICE_FIND_BY_BUS)
- && (flags & USB_DEVICE_FIND_BY_VENDOR)) {
- if (found_prod != product ||
- found_vend != vendor ||
- found_bus != bus ||
- found_devno != devno)
- continue;
- found = true;
- }
+ if ((flags & USB_DEVICE_FIND_BY_BUS) &&
+ (found_bus != bus || found_devno != devno))
+ continue;
usb = usbGetDevice(found_bus, found_devno);
if (!usb)
@@ -187,7 +171,7 @@ usbDeviceSearch(unsigned int vendor,
goto cleanup;
}
- if (found)
+ if (flags & USB_DEVICE_FIND_ONE)
break;
}
ret = list;
@@ -195,7 +179,7 @@ usbDeviceSearch(unsigned int vendor,
cleanup:
if (dir) {
int saved_errno = errno;
- closedir (dir);
+ closedir(dir);
errno = saved_errno;
}
@@ -209,7 +193,8 @@ usbFindDeviceByVendor(unsigned int vendor, unsigned
product)
{
usbDeviceList *list;
- if (!(list = usbDeviceSearch(vendor, product, 0 , 0,
USB_DEVICE_FIND_BY_VENDOR)))
+ if (!(list = usbDeviceSearch(vendor, product, 0 , 0,
+ USB_DEVICE_FIND_BY_VENDOR)))
return NULL;
if (list->count == 0) {
@@ -228,12 +213,14 @@ usbFindDeviceByBus(unsigned int bus, unsigned devno)
usbDevice *usb;
usbDeviceList *list;
- if (!(list = usbDeviceSearch(0, 0, bus, devno,
USB_DEVICE_FIND_BY_BUS)))
+ if (!(list = usbDeviceSearch(0, 0, bus, devno,
+ USB_DEVICE_FIND_BY_BUS |
USB_DEVICE_FIND_ONE)))
return NULL;
if (list->count == 0) {
usbReportError(VIR_ERR_INTERNAL_ERROR,
- _("Did not find USB device bus:%u device:%u"),
bus, devno);
+ _("Did not find USB device bus:%u device:%u"),
+ bus, devno);
usbDeviceListFree(list);
return NULL;
}
@@ -254,7 +241,9 @@ usbFindDevice(unsigned int vendor,
usbDevice *usb;
usbDeviceList *list;
- unsigned int flags = USB_DEVICE_FIND_BY_VENDOR|USB_DEVICE_FIND_BY_BUS;
+ unsigned int flags = (USB_DEVICE_FIND_BY_VENDOR |
+ USB_DEVICE_FIND_BY_BUS |
+ USB_DEVICE_FIND_ONE);
if (!(list = usbDeviceSearch(vendor, product, bus, devno, flags)))
return NULL;
--
Eric Blake eblake@xxxxxxxxxx +1-919-301-3266
Libvirt virtualization library http://libvirt.org
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