Scsi - Index of

associate_dev()相对应.我们来看一下具体代码,来自drivers/usb/storage/usb.c,把这两个函数的代
码都一并贴出来:
815 /* Release all our dynamic resources */
816 void usb_stor_release_resources(struct us_data *us)
817 {
818 US_DEBUGP("-- %s\n", __FUNCTION__);
819
820 /* Kill the control thread. The SCSI host must already have been
821 * removed so it won't try to queue any more commands.
822 */
823 if (us->pid) {
824
825 /* Wait for the thread to be idle */
826 down(&us->dev_semaphore);
827 US_DEBUGP("-- sending exit command to thread\n");
828
829 /* If the SCSI midlayer queued a final command just before
830 * scsi_remove_host() was called, us->srb might not be
831 * NULL. We can overwrite it safely, because the midlayer
832 * will not wait for the command to finish. Also the
833 * control thread will already have been awakened.
834 * That's okay, an extra up() on us->sema won't hurt.
835 *
836 * Enqueue the command, wake up the thread, and wait for
837 * notification that it has exited.
838 */
839 scsi_lock(us->host);
840 us->srb = NULL;
841 scsi_unlock(us->host);
842 up(&us->dev_semaphore);
843
844 up(&us->sema);
845 wait_for_completion(&us->notify);
846 }
847
848 /* Call the destructor routine, if it exists */
196
849 if (us->extra_destructor) {
850 US_DEBUGP("-- calling extra_destructor()\n");
851 us->extra_destructor(us->extra);
852 }
853
854 /* Finish the host removal sequence */
855 if (us->host)