scsi: remove the old scsi_module.c initialization model

After more than 15 years all users of this legacy interface are finally
gone.  Rest in peace!

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 1 insertions, 121 deletions

diff --git a/Documentation/scsi/scsi_mid_low_api.txt b/Documentation/scsi/scsi_mid_low_api.txt
index 2c31d9ee6776..177c031763c0 100644
--- a/Documentation/scsi/scsi_mid_low_api.txt
+++ b/Documentation/scsi/scsi_mid_low_api.txt
@@ -114,9 +114,7 @@ called "xxx" could be defined as
 "static int xxx_slave_alloc(struct scsi_device * sdev) { /* code */ }"
 
 ** the scsi_host_alloc() function is a replacement for the rather vaguely
-named scsi_register() function in most situations. The scsi_register()
-and scsi_unregister() functions remain to support legacy LLDs that use
-the passive initialization model.
+named scsi_register() function in most situations.
 
 
 Hotplug initialization model
@@ -228,79 +226,6 @@ slave_configure() callbacks). Such instances are "owned" by the mid-level.
 struct scsi_device instances are freed after slave_destroy().
 
 
-Passive initialization model
-============================
-These older LLDs include a file called "scsi_module.c" [yes the ".c" is a
-little surprising] in their source code. For that file to work an
-instance of struct scsi_host_template with the name "driver_template"
-needs to be defined. Here is a typical code sequence used in this model:
-    static struct scsi_host_template driver_template = {
-        ...
-    };
-    #include "scsi_module.c"
-
-The scsi_module.c file contains two functions:
-  - init_this_scsi_driver() which is executed when the LLD is
-    initialized (i.e. boot time or module load time)
-  - exit_this_scsi_driver() which is executed when the LLD is shut
-    down (i.e. module unload time)
-Note: since these functions are tagged with __init and __exit qualifiers
-an LLD should not call them explicitly (since the kernel does that).
-
-Here is an example of an initialization sequence when two hosts are
-detected (so detect() returns 2) and the SCSI bus scan on each host
-finds 1 SCSI device (and a second device does not respond).
-
-LLD                      mid level                 LLD
-===----------------------=========-----------------===------
-init_this_scsi_driver() ----+
-                            |
-                         detect()  -----------------+
-                            |                       |
-                            |                scsi_register()
-                            |                scsi_register()
-                            |
-                      slave_alloc()
-                      slave_configure()  -->  scsi_change_queue_depth()
-                      slave_alloc()   ***
-                      slave_destroy() ***
-                            |
-                      slave_alloc()
-                      slave_configure()
-                      slave_alloc()   ***
-                      slave_destroy() ***
-------------------------------------------------------------
-
-The mid level invokes scsi_change_queue_depth() with "cmd_per_lun" for that
-host as the queue length. These settings can be overridden by a
-slave_configure() supplied by the LLD.
-
-*** For scsi devices that the mid level tries to scan but do not
-    respond, a slave_alloc(), slave_destroy() pair is called.
-
-Here is an LLD shutdown sequence:
-
-LLD                      mid level                 LLD
-===----------------------=========-----------------===------
-exit_this_scsi_driver() ----+
-                            |
-                     slave_destroy()
-                        release()   -->   scsi_unregister()
-                            |
-                     slave_destroy()
-                        release()   -->   scsi_unregister()
-------------------------------------------------------------
-
-An LLD need not define slave_destroy() (i.e. it is optional). 
-
-The shortcoming of the "passive initialization model" is that host
-registration and de-registration are (typically) tied to LLD initialization
-and shutdown. Once the LLD is initialized then a new host that appears
-(e.g. via hotplugging) cannot easily be added without a redundant
-driver shutdown and re-initialization. It may be possible to write an LLD
-that uses both initialization models.
-
-
 Reference Counting
 ==================
 The Scsi_Host structure has had reference counting infrastructure added.
@@ -738,7 +663,6 @@ The interface functions are listed below in alphabetical order.
 
 Summary:
    bios_param - fetch head, sector, cylinder info for a disk
-   detect - detects HBAs this driver wants to control
    eh_timed_out - notify the host that a command timer expired
    eh_abort_handler - abort given command
    eh_bus_reset_handler - issue SCSI bus reset
@@ -748,7 +672,6 @@ Summary:
    ioctl - driver can respond to ioctls
    proc_info - supports /proc/scsi/{driver_name}/{host_no}
    queuecommand - queue scsi command, invoke 'done' on completion
-   release - release all resources associated with given host
    slave_alloc - prior to any commands being sent to a new device 
    slave_configure - driver fine tuning for given device after attach
    slave_destroy - given device is about to be shut down
@@ -785,28 +708,6 @@ Details:
 
 
 /**
- *      detect - detects HBAs this driver wants to control
- *      @shtp: host template for this driver.
- *
- *      Returns number of hosts this driver wants to control. 0 means no
- *      suitable hosts found.
- *
- *      Locks: none held
- *
- *      Calling context: process [invoked from init_this_scsi_driver()]
- *
- *      Notes: First function called from the SCSI mid level on this
- *      driver. Upper level drivers (e.g. sd) may not (yet) be present.
- *      For each host found, this method should call scsi_register() 
- *      [see hosts.c].
- *
- *      Defined in: LLD (required if "passive initialization mode" is used,
- *                       not invoked in "hotplug initialization mode")
- **/
-    int detect(struct scsi_host_template * shtp)
-
-
-/**
  *      eh_timed_out - The timer for the command has just fired
  *      @scp: identifies command timing out
  *
@@ -1074,27 +975,6 @@ Details:
 
 
 /**
- *      release - release all resources associated with given host
- *      @shp: host to be released.
- *
- *      Return value ignored (could soon be a function returning void).
- *
- *      Locks: none held
- *
- *      Calling context: process
- *
- *      Notes: Invoked from scsi_module.c's exit_this_scsi_driver().
- *      LLD's implementation of this function should call 
- *      scsi_unregister(shp) prior to returning.
- *      Only needed for old-style host templates.
- *
- *      Defined in: LLD (required in "passive initialization model",
- *                       should not be defined in hotplug model)
- **/
-    int release(struct Scsi_Host * shp)
-
-
-/**
  *      slave_alloc -   prior to any commands being sent to a new device 
  *                      (i.e. just prior to scan) this call is made
  *      @sdp: pointer to new device (about to be scanned)