loop: properly send KOBJ_CHANGED uevent for disk device

The original commit message and the wording "uncork" in the code comment
indicate that it is expected that the suppressed event instances are
automatically sent after unsuppressing.
This is not the case, instead they are discarded.
In effect this means that no "changed" events are emitted on the device
itself by default.
While each discovered partition does trigger a changed event on the
device, devices without partitions don't have any event emitted.

This makes udev miss the device creation and prompted workarounds in
userspace. See the linked util-linux/losetup bug.

Explicitly emit the events and drop the confusingly worded comments.

Link: https://github.com/util-linux/util-linux/issues/2434
Fixes: 498ef5c777d9 ("loop: suppress uevents while reconfiguring the device")
Cc: stable@vger.kernel.org
Signed-off-by: Thomas Weißschuh <thomas.weissschuh@linutronix.de>
Link: https://lore.kernel.org/r/20250415-loop-uevent-changed-v2-1-0c4e6a923b2a@linutronix.de
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index dd7f33d47f4f82fd6f048393c53240325c29a263..3be7f00e7fc740da2745ffbccfcebe53eef2ddaa 100644 (file)
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -667,8 +667,8 @@ static int loop_change_fd(struct loop_device *lo, struct block_device *bdev,
 
        error = 0;
 done:
-       /* enable and uncork uevent now that we are done */
        dev_set_uevent_suppress(disk_to_dev(lo->lo_disk), 0);
+       kobject_uevent(&disk_to_dev(lo->lo_disk)->kobj, KOBJ_CHANGE);
        return error;
 
 out_err:
@@ -1129,8 +1129,8 @@ static int loop_configure(struct loop_device *lo, blk_mode_t mode,
        if (partscan)
                clear_bit(GD_SUPPRESS_PART_SCAN, &lo->lo_disk->state);
 
-       /* enable and uncork uevent now that we are done */
        dev_set_uevent_suppress(disk_to_dev(lo->lo_disk), 0);
+       kobject_uevent(&disk_to_dev(lo->lo_disk)->kobj, KOBJ_CHANGE);
 
        loop_global_unlock(lo, is_loop);
        if (partscan)