loop: properly send KOBJ_CHANGED uevent for disk device

commit e7bc0010ceb403d025100698586c8e760921d471 upstream.

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>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index 886c635990377921d7df844bb2dcc24d450ca746..6ea448511ff16b01feccf9c700796a96e9f2a28d 100644 (file)
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -629,8 +629,8 @@ 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:
@@ -1104,8 +1104,8 @@ 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)