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<P>"too many alternate settings for
"<BR>
"config %d interface %d: %d,
"<BR>
"using maximum allowed:
%d\n",<BR>
cfgno, inums[i], j,
USB_MAXALTSETTING);<BR>
nalts[i] = j =
USB_MAXALTSETTING;<BR>
}<BR> <BR> len =
sizeof(*intfc) + sizeof(struct usb_host_interface) *
j;<BR> config->intf_cache[i]
= intfc = kzalloc(len,
GFP_KERNEL);<BR> if
(!intfc)<BR>
return -ENOMEM;<BR>
kref_init(&intfc->ref);<BR>
}<BR> <BR> /* Skip over any Class Specific or
Vendor Specific descriptors;<BR> * find the first
interface descriptor */<BR>
//config->extar:config的扩展部份,即interface
config的那部份<BR> config->extra =
buffer;<BR>
//找到一下个USB_DT_INTERFACE项.返回跳过去的数据长度和描述符项<BR> i =
find_next_descriptor(buffer, size, USB_DT_INTERFACE,<BR>
USB_DT_INTERFACE, &n);<BR>
config->extralen = i;<BR>
//到现在为止,config->extra返回的是下一个配置描述符起始地址<BR>
//config->extralen下一个配置描述符地址和config->extra的偏移值<BR>
if (n > 0)<BR> dev_dbg(ddev,
"skipped %d descriptor%s after
%s\n",<BR> n,
plural(n), "configuration");<BR> //现在interface
config有效的起点位置,size有效大小<BR> buffer +=
i;<BR> size -= i;<BR> <BR>
/* Parse all the interface/altsetting descriptors */<BR>
while (size > 0) {<BR> retval
= usb_parse_interface(ddev, cfgno,
config,<BR>
buffer, size, inums, nalts);<BR>
if (retval <
0)<BR>
return retval;<BR> <BR>
buffer += retval;<BR> size -=
retval;<BR> }<BR> <BR> /*
Check for missing altsettings */<BR>
//检查config->inft)cache[]中是否有异常<BR> for (i = 0; i <
nintf; ++i) {<BR> intfc =
config->intf_cache[i];<BR>
for (j = 0; j < intfc->num_altsetting; ++j)
{<BR>
for (n = 0; n < intfc->num_altsetting; ++n)
{<BR>
if
(intfc->altsetting[n].desc.<BR>
bAlternateSetting ==
j)<BR>
break;<BR>
}<BR>
if (n >=
intfc->num_altsetting)<BR>
dev_warn(ddev, "config %d interface %d has no
"<BR>
"altsetting %d\n", cfgno, inums[i],
j);<BR>
}<BR> }<BR> <BR> return
0;<BR>}<BR>usb_parse_interface()代码如下:<BR>static int usb_parse_interface(struct
device *ddev, int cfgno,<BR> struct usb_host_config *config,
unsigned char *buffer, int size,<BR> u8 inums[], u8
nalts[])<BR>{<BR> unsigned char *buffer0 =
buffer;<BR> struct usb_interface_descriptor
*d;<BR> int inum, asnum;<BR>
struct usb_interface_cache *intfc;<BR> struct
usb_host_interface *alt;<BR> int i,
n;<BR> int len, retval;<BR> int
num_ep, num_ep_orig;<BR> <BR> d = (struct
usb_interface_descriptor *) buffer;<BR> buffer +=
d->bLength;<BR> size -=
d->bLength;<BR> <BR> if (d->bLength <
USB_DT_INTERFACE_SIZE)<BR> goto
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