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From: Christoph Hellwig <hch@lst.de>
To: axboe@kernel.dk
Cc: linux-block@vger.kernel.org
Subject: [PATCH 1/2] block: grab a device refcount in disk_uevent
Date: Thu,  1 Jul 2021 10:16:37 +0200
Message-ID: <20210701081638.246552-2-hch@lst.de> (raw)
In-Reply-To: <20210701081638.246552-1-hch@lst.de>

Sending uevents requires the struct device to be alive.  To
ensure that grab the device refcount instead of just an inode
reference.

Fixes: bc359d03c7ec ("block: add a disk_uevent helper")
Signed-off-by: Christoph Hellwig <hch@lst.de>
---
 block/genhd.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 79aa40b4c39c..af4d2ab4a633 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -365,12 +365,12 @@ void disk_uevent(struct gendisk *disk, enum kobject_action action)
 	xa_for_each(&disk->part_tbl, idx, part) {
 		if (bdev_is_partition(part) && !bdev_nr_sectors(part))
 			continue;
-		if (!bdgrab(part))
+		if (!kobject_get_unless_zero(&part->bd_device.kobj))
 			continue;
 
 		rcu_read_unlock();
 		kobject_uevent(bdev_kobj(part), action);
-		bdput(part);
+		put_device(&part->bd_device);
 		rcu_read_lock();
 	}
 	rcu_read_unlock();
-- 
2.30.2


  reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-01  8:16 two fixup for the block_device / hd_struct merge Christoph Hellwig
2021-07-01  8:16 ` Christoph Hellwig [this message]
2021-07-01  8:54   ` [PATCH 1/2] block: grab a device refcount in disk_uevent Ming Lei
2021-07-01  9:02     ` Christoph Hellwig
2021-07-01  9:17       ` Ming Lei
2021-07-01  9:27         ` Ming Lei
2021-07-01  9:49           ` Christoph Hellwig
2021-07-01  8:16 ` [PATCH 2/2] block: remove the bdgrab in blk_drop_partitions Christoph Hellwig
2021-07-01 16:21 ` two fixup for the block_device / hd_struct merge Jens Axboe

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