Patch for sd cleanup

[Pete Zaitcev]

Marcelo's 2.4.18 does not have this:

--- linux-2.4.18/drivers/scsi/sd.c	Mon Feb 25 11:38:04 2002
+++ linux-2.4.18-p3/drivers/scsi/sd.c	Mon Feb 25 17:09:59 2002
@@ -279,7 +279,7 @@
  	target = DEVICE_NR(dev);
 
 	dpnt = &rscsi_disks[target];
-	if (!dpnt)
+	if (!dpnt->device)
 		return NULL;	/* No such device */
 	return &dpnt->device->request_queue;
 }
@@ -302,7 +302,7 @@
 
 	dpnt = &rscsi_disks[dev];
 	if (devm >= (sd_template.dev_max << 4) ||
-	    !dpnt ||
+	    !dpnt->device ||
 	    !dpnt->device->online ||
  	    block + SCpnt->request.nr_sectors > sd[devm].nr_sects) {
 		SCSI_LOG_HLQUEUE(2, printk("Finishing %ld sectors\n", SCpnt->request.nr_sectors));

The subject was beaten to death on lists. The patch must go in.
BTW, 2.5 has the same defect.

Since we are on the topic of sd.c cleanup, here's one more for you.
I posted it before. Someone please try it out and let me know
if anything interesting happens (say, slab area corruption :)

--- linux-2.4.18/drivers/scsi/sd.c	Mon Feb 25 11:38:04 2002
+++ linux-2.4.18-p3/drivers/scsi/sd.c	Mon Feb 25 17:09:59 2002
@@ -1412,10 +1412,14 @@
 		kfree(sd_blocksizes);
 		kfree(sd_hardsizes);
 		kfree((char *) sd);
+		for (i = 0; i < N_USED_SD_MAJORS; i++) {
+			kfree(sd_gendisks[i].de_arr);
+			kfree(sd_gendisks[i].flags);
+		}
 	}
 	for (i = 0; i < N_USED_SD_MAJORS; i++) {
 		del_gendisk(&sd_gendisks[i]);
-		blk_size[SD_MAJOR(i)] = NULL;
+		blksize_size[SD_MAJOR(i)] = NULL;
 		hardsect_size[SD_MAJOR(i)] = NULL;
 		read_ahead[SD_MAJOR(i)] = 0;
 	}

-- Pete