Scsi - Index of

至此,get_pipes函数结束了,信息都保存到了us里面.下面us该发挥她的作用了.回到storage_probe()
函数,998行,把us作为参数传递给了usb_stor_acquire_resources()函数.而这个函数才是故事的高潮.
每一个有识之士在看过这个函数之后就会豁然开朗,都会感慨,一下子就看到了春天,看到了光明,原来
Linux 中的设备驱动程序就是这么工作的啊!
996
997 /* Acquire all the other resources and add the host */
998 result = usb_stor_acquire_resources(us);
999 if (result)
1000 goto BadDevice;
1001 result = scsi_add_host(us->host, &intf->dev);
1002 if (result) {
1003 printk(KERN_WARNING USB_STORAGE
1004 "Unable to add the scsi host\n");
1005 goto BadDevice;
1006 }
我们来看usb_stor_acquire_resources 函数.它被定义于drivers/usb/storage/usb.c 中:
755 /* Initialize all the dynamic resources we need */
756 static int usb_stor_acquire_resources(struct us_data *us)
757 {
758 int p;
759
760 us->current_urb = usb_alloc_urb(0, GFP_KERNEL);
761 if (!us->current_urb) {
762 US_DEBUGP("URB allocation failed\n");
763 return -ENOMEM;
62
764 }
765
766 /* Lock the device while we carry out the next two operations */
767 down(&us->dev_semaphore);
768
769 /* For bulk-only devices, determine the max LUN value */
770 if (us->protocol == US_PR_BULK) {
771 p = usb_stor_Bulk_max_lun(us);
772 if (p < 0) {
773 up(&us->dev_semaphore);
774 return p;
775 }
776 us->max_lun = p;
777 }
778
779 /* Just before we start our control thread, initialize
780 * the device if it needs initialization */
781 if (us->unusual_dev->initFunction)