release/src-rt-6.x.4708/linux/linux-2.6.36/drivers/scsi/scsi_wait_scan.c

   1 /*
   2  * scsi_wait_scan.c
   3  *
   4  * Copyright (C) 2006 James Bottomley <James.Bottomley@SteelEye.com>
   5  *
   6  * This is a simple module to wait until all the async scans are
   7  * complete.  The idea is to use it in initrd/initramfs scripts.  You
   8  * modprobe it after all the modprobes of the root SCSI drivers and it
   9  * will wait until they have all finished scanning their busses before
  10  * allowing the boot to proceed
  11  */
  12
  13 #include <linux/module.h>
  14 #include <linux/device.h>
  15 #include <scsi/scsi_scan.h>
  16
  17 static int __init wait_scan_init(void)
  18 {
  19         /*
  20          * First we need to wait for device probing to finish;
  21          * the drivers we just loaded might just still be probing
  22          * and might not yet have reached the scsi async scanning
  23          */
  24         wait_for_device_probe();
  25         /*
  26          * and then we wait for the actual asynchronous scsi scan
  27          * to finish.
  28          */
  29         scsi_complete_async_scans();
  30         return 0;
  31 }
  32
  33 static void __exit wait_scan_exit(void)
  34 {
  35 }
  36
  37 MODULE_DESCRIPTION("SCSI wait for scans");
  38 MODULE_AUTHOR("James Bottomley");
  39 MODULE_LICENSE("GPL");
  40
  41 late_initcall(wait_scan_init);
  42 module_exit(wait_scan_exit);