From: Christoph Hellwig <hch@lst.de>
Date: Wed, 24 Mar 2021 13:03:01 +0000 (+0100)
Subject: block: add a RCU grace period to delete_partition
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=refs%2Fheads%2Fpart-iter-fix;p=users%2Fhch%2Fblock.git

block: add a RCU grace period to delete_partition

Signed-off-by: Christoph Hellwig <hch@lst.de>
---

diff --git a/block/partitions/core.c b/block/partitions/core.c
index 78eb20862edf..3ea0eeebf416 100644
--- a/block/partitions/core.c
+++ b/block/partitions/core.c
@@ -289,16 +289,12 @@ struct device_type part_type = {
  */
 void delete_partition(struct block_device *part)
 {
+	remove_inode_hash(part->bd_inode);
 	xa_erase(&part->bd_disk->part_tbl, part->bd_partno);
+	synchronize_rcu();
+
 	kobject_put(part->bd_holder_dir);
 	device_del(&part->bd_device);
-
-	/*
-	 * Remove the block device from the inode hash, so that it cannot be
-	 * looked up any more even when openers still hold references.
-	 */
-	remove_inode_hash(part->bd_inode);
-
 	put_device(&part->bd_device);
 }