Merge tag 'for-linus-20130409' of git://git.kernel.dk/linux-block

Pull block fixes from Jens Axboe:
 "I've got a few smaller fixes queued up for 3.9 that should go in.  The
  major one is the loop regression, the others are nice fixes on their
  own though.  It contains:

   - Fix for unitialized var in the block sysfs code, courtesy of Arnd
     and gcc-4.8.

   - Two fixes for mtip32xx, fixing probe and command timeout.  Also a
     debug measure that could have waited for 3.10, but it's driver
     only, so I let it slip in.

   - Revert the loop partition cleanup fix, it could cause a deadlock on
     auto-teardown as part of umount.  The fix is clear, but at this
     point we just want to revert it and get a real fix in for 3.10."

* tag 'for-linus-20130409' of git://git.kernel.dk/linux-block:
  Revert "loop: cleanup partitions when detaching loop device"
  mtip32xx: fix two smatch warnings
  mtip32xx: Add debugfs entry device_status
  mtip32xx: return 0 from pci probe in case of rebuild
  mtip32xx: recovery from command timeout
  block: avoid using uninitialized value in from queue_var_store

block/blk-sysfs.c

@@ -229,6 +229,8 @@ queue_store_##name(struct request_queue *q, const char *page, size_t count) \
 	unsigned long val;						\
 	ssize_t ret;							\
 	ret = queue_var_store(&val, page, count);			\
+	if (ret < 0)							\
+		 return ret;						\
 	if (neg)							\
 		val = !val;						\
 									\

block/partition-generic.c

@@ -257,7 +257,6 @@ void delete_partition(struct gendisk *disk, int partno)
 
 	hd_struct_put(part);
 }
-EXPORT_SYMBOL(delete_partition);
 
 static ssize_t whole_disk_show(struct device *dev,
 			       struct device_attribute *attr, char *buf)

drivers/block/loop.c

@@ -1051,29 +1051,12 @@ static int loop_clr_fd(struct loop_device *lo)
 	lo->lo_state = Lo_unbound;
 	/* This is safe: open() is still holding a reference. */
 	module_put(THIS_MODULE);
+	if (lo->lo_flags & LO_FLAGS_PARTSCAN && bdev)
+		ioctl_by_bdev(bdev, BLKRRPART, 0);
 	lo->lo_flags = 0;
 	if (!part_shift)
 		lo->lo_disk->flags |= GENHD_FL_NO_PART_SCAN;
 	mutex_unlock(&lo->lo_ctl_mutex);
-
-	/*
-	 * Remove all partitions, since BLKRRPART won't remove user
-	 * added partitions when max_part=0
-	 */
-	if (bdev) {
-		struct disk_part_iter piter;
-		struct hd_struct *part;
-
-		mutex_lock_nested(&bdev->bd_mutex, 1);
-		invalidate_partition(bdev->bd_disk, 0);
-		disk_part_iter_init(&piter, bdev->bd_disk,
-					DISK_PITER_INCL_EMPTY);
-		while ((part = disk_part_iter_next(&piter)))
-			delete_partition(bdev->bd_disk, part->partno);
-		disk_part_iter_exit(&piter);
-		mutex_unlock(&bdev->bd_mutex);
-	}
-
 	/*
 	 * Need not hold lo_ctl_mutex to fput backing file.
 	 * Calling fput holding lo_ctl_mutex triggers a circular