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, 10 insertions, 18 deletions

diff --git a/drivers/scsi/sd.c b/drivers/scsi/sd.c
index a69b155..cb85296 100644
--- a/drivers/scsi/sd.c
+++ b/drivers/scsi/sd.c
@@ -86,19 +86,6 @@ MODULE_ALIAS_SCSI_DEVICE(TYPE_DISK);
 MODULE_ALIAS_SCSI_DEVICE(TYPE_MOD);
 MODULE_ALIAS_SCSI_DEVICE(TYPE_RBC);
 
-static int  sd_revalidate_disk(struct gendisk *);
-static int  sd_probe(struct device *);
-static int  sd_remove(struct device *);
-static void sd_shutdown(struct device *);
-static int sd_suspend(struct device *, pm_message_t state);
-static int sd_resume(struct device *);
-static void sd_rescan(struct device *);
-static int sd_done(struct scsi_cmnd *);
-static void sd_read_capacity(struct scsi_disk *sdkp, unsigned char *buffer);
-static void scsi_disk_release(struct class_device *cdev);
-static void sd_print_sense_hdr(struct scsi_disk *, struct scsi_sense_hdr *);
-static void sd_print_result(struct scsi_disk *, int);
-
 static DEFINE_IDR(sd_index_idr);
 static DEFINE_SPINLOCK(sd_index_lock);
 
@@ -253,7 +240,6 @@ static struct scsi_driver sd_template = {
 		.shutdown	= sd_shutdown,
 	},
 	.rescan			= sd_rescan,
-	.done			= sd_done,
 };
 
 /*
@@ -523,6 +509,12 @@ static int sd_prep_fn(struct request_queue *q, struct request *rq)
 	SCpnt->timeout_per_command = timeout;
 
 	/*
+	 * This is the completion routine we use.  This is matched in terms
+	 * of capability to this function.
+	 */
+	SCpnt->done = sd_rw_intr;
+
+	/*
 	 * This indicates that the command is ready from our end to be
 	 * queued.
 	 */
@@ -895,13 +887,13 @@ static struct block_device_operations sd_fops = {
 };
 
 /**
- *	sd_done - bottom half handler: called when the lower level
+ *	sd_rw_intr - bottom half handler: called when the lower level
  *	driver has completed (successfully or otherwise) a scsi command.
  *	@SCpnt: mid-level's per command structure.
  *
  *	Note: potentially run from within an ISR. Must not block.
  **/
-static int sd_done(struct scsi_cmnd *SCpnt)
+static void sd_rw_intr(struct scsi_cmnd * SCpnt)
 {
 	int result = SCpnt->result;
  	unsigned int xfer_size = SCpnt->request_bufflen;
@@ -922,7 +914,7 @@ static int sd_done(struct scsi_cmnd *SCpnt)
 	SCSI_LOG_HLCOMPLETE(1, scsi_print_result(SCpnt));
 	if (sense_valid) {
 		SCSI_LOG_HLCOMPLETE(1, scmd_printk(KERN_INFO, SCpnt,
-						   "sd_done: sb[respc,sk,asc,"
+						   "sd_rw_intr: sb[respc,sk,asc,"
 						   "ascq]=%x,%x,%x,%x\n",
 						   sshdr.response_code,
 						   sshdr.sense_key, sshdr.asc,
@@ -994,7 +986,7 @@ static int sd_done(struct scsi_cmnd *SCpnt)
 		break;
 	}
  out:
-	return good_bytes;
+	scsi_io_completion(SCpnt, good_bytes);
 }
 
 static int media_not_present(struct scsi_disk *sdkp,