Scsi - Index of

1023 dissociate_dev(us);
1024 return result;
1025 }
1026
115
又一次见到了kernel_thread,不需要更多解释,这里自然还是创建一个内核守护进程,只不过这次是
usb_stor_scan_thread,而上次是usb_stor_control_thread.usb_stor_scan_thread()函数也是定
义于drivers/usb/storage/usb.c 中:
886 /* Thread to carry out delayed SCSI-device scanning */
887 static int usb_stor_scan_thread(void * __us)
888 {
889 struct us_data *us = (struct us_data *)__us;
890
891 /*
892 * This thread doesn't need any user-level access,
893 * so get rid of all our resources.
894 */
895 lock_kernel();
896 daemonize("usb-stor-scan");
897 unlock_kernel();
898
899 printk(KERN_DEBUG
900 "usb-storage: device found at %d\n", us->pusb_dev->devnum);
901
902 /* Wait for the timeout to expire or for a disconnect */
903 if (delay_use > 0) {
904 printk(KERN_DEBUG "usb-storage: waiting for device "
905 "to settle before scanning\n");
906 retry:
907 wait_event_interruptible_timeout(us->scsi_scan_wait,
908 test_bit(US_FLIDX_DISCONNECTING, &us->flags),
909 delay_use * HZ);
910 if (current->flags & PF_FREEZE) {
911 refrigerator(PF_FREEZE);
912 goto retry;
913 }
914 }
915
916 /* If the device is still connected, perform the scanning */
917 if (!test_bit(US_FLIDX_DISCONNECTING, &us->flags)) {
918 scsi_scan_host(us->host);
919 printk(KERN_DEBUG "usb-storage: device scan complete\n");
920 }
921