linux-kernel - Re: [REGRESSION] "add a disk_uevent helper" breaks booting Andorid w/ dynamic partitions

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Date:   Tue, 23 Feb 2021 07:31:30 +0100
From:   Christoph Hellwig <hch@....de>
To:     John Stultz <john.stultz@...aro.org>
Cc:     Christoph Hellwig <hch@....de>, Tejun Heo <tj@...nel.org>,
        Jens Axboe <axboe@...nel.dk>,
        David Anderson <dvander@...gle.com>,
        linux-block@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>,
        Todd Kjos <tkjos@...gle.com>,
        Amit Pundir <amit.pundir@...aro.org>,
        Alistair Delva <adelva@...gle.com>
Subject: Re: [REGRESSION] "add a disk_uevent helper" breaks booting Andorid
 w/ dynamic partitions

Please try the patch below:

---
>From 85943345b41ec04f5a9e92dfad85b0fb24e2d2eb Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@....de>
Date: Tue, 23 Feb 2021 07:28:22 +0100
Subject: block: don't skip empty device in in disk_uevent

Restore the previous behavior by using the correct flag for the whole device
("part0").

Fixes: 99dfc43ecbf6 ("block: use ->bi_bdev for bio based I/O accounting")
Reported-by: John Stultz <john.stultz@...aro.org>
Signed-off-by: Christoph Hellwig <hch@....de>
---
 block/genhd.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/block/genhd.c b/block/genhd.c
index dbb92e24ef65ed..fcc530164b5ab4 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -476,7 +476,7 @@ void disk_uevent(struct gendisk *disk, enum kobject_action action)
 	struct disk_part_iter piter;
 	struct block_device *part;
 
-	disk_part_iter_init(&piter, disk, DISK_PITER_INCL_PART0);
+	disk_part_iter_init(&piter, disk, DISK_PITER_INCL_EMPTY_PART0);
 	while ((part = disk_part_iter_next(&piter)))
 		kobject_uevent(bdev_kobj(part), action);
 	disk_part_iter_exit(&piter);
-- 
2.29.2