scsi: revert "[SCSI] Get rid of scsi_cmnd->done"

This reverts commit 6f5391c283d7fdcf24bf40786ea79061919d1e1d ("[SCSI]
Get rid of scsi_cmnd->done") that was supposed to be a cleanup commit,
but apparently it causes regressions:

  Bug 9370 - v2.6.24-rc2-409-g9418d5d: attempt to access beyond end of device
  http://bugzilla.kernel.org/show_bug.cgi?id=9370

this patch should be reintroduced in a more split-up form to make
testing of it easier.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Matthew Wilcox <matthew@wil.cx>
Cc: James Bottomley <James.Bottomley@HansenPartnership.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 3 insertions, 17 deletions

diff --git a/drivers/scsi/scsi.c b/drivers/scsi/scsi.c
index 0fb1709ce5e3..7ceb8209e5df 100644
--- a/drivers/scsi/scsi.c
+++ b/drivers/scsi/scsi.c
@@ -59,7 +59,6 @@
 #include <scsi/scsi_cmnd.h>
 #include <scsi/scsi_dbg.h>
 #include <scsi/scsi_device.h>
-#include <scsi/scsi_driver.h>
 #include <scsi/scsi_eh.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_tcq.h>
@@ -368,8 +367,9 @@ void scsi_log_send(struct scsi_cmnd *cmd)
                         scsi_print_command(cmd);
                         if (level > 3) {
                                 printk(KERN_INFO "buffer = 0x%p, bufflen = %d,"
-                                       " queuecommand 0x%p\n",
+                                       " done = 0x%p, queuecommand 0x%p\n",
                                         scsi_sglist(cmd), scsi_bufflen(cmd),
+                                        cmd->done,
                                         cmd->device->host->hostt->queuecommand);
 
                         }
@@ -654,12 +654,6 @@ void __scsi_done(struct scsi_cmnd *cmd)
         blk_complete_request(rq);
 }
 
-/* Move this to a header if it becomes more generally useful */
-static struct scsi_driver *scsi_cmd_to_driver(struct scsi_cmnd *cmd)
-{
-        return *(struct scsi_driver **)cmd->request->rq_disk->private_data;
-}
-
 /*
  * Function:    scsi_finish_command
  *
@@ -671,8 +665,6 @@ void scsi_finish_command(struct scsi_cmnd *cmd)
 {
         struct scsi_device *sdev = cmd->device;
         struct Scsi_Host *shost = sdev->host;
-        struct scsi_driver *drv;
-        unsigned int good_bytes;
 
         scsi_device_unbusy(sdev);
 
@@ -698,13 +690,7 @@ void scsi_finish_command(struct scsi_cmnd *cmd)
                                 "Notifying upper driver of completion "
                                 "(result %x)\n", cmd->result));
 
-        good_bytes = cmd->request_bufflen;
-        if (cmd->request->cmd_type != REQ_TYPE_BLOCK_PC) {
-                drv = scsi_cmd_to_driver(cmd);
-                if (drv->done)
-                        good_bytes = drv->done(cmd);
-        }
-        scsi_io_completion(cmd, good_bytes);
+        cmd->done(cmd);
 }
 EXPORT_SYMBOL(scsi_finish_command);