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    Subject[PATCH 5.10 090/593] loop: Fix missing discard support when using LOOP_CONFIGURE
    Date
    From: Kristian Klausen <kristian@klausen.dk>

    commit 2b9ac22b12a266eb4fec246a07b504dd4983b16b upstream.

    Without calling loop_config_discard() the discard flag and parameters
    aren't set/updated for the loop device and worst-case they could
    indicate discard support when it isn't the case (ex: if the
    LOOP_SET_STATUS ioctl was used with a different file prior to
    LOOP_CONFIGURE).

    Cc: <stable@vger.kernel.org> # 5.8.x-
    Fixes: 3448914e8cc5 ("loop: Add LOOP_CONFIGURE ioctl")
    Signed-off-by: Kristian Klausen <kristian@klausen.dk>
    Link: https://lore.kernel.org/r/20210618115157.31452-1-kristian@klausen.dk
    Signed-off-by: Jens Axboe <axboe@kernel.dk>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/block/loop.c | 1 +
    1 file changed, 1 insertion(+)

    --- a/drivers/block/loop.c
    +++ b/drivers/block/loop.c
    @@ -1161,6 +1161,7 @@ static int loop_configure(struct loop_de
    blk_queue_physical_block_size(lo->lo_queue, bsize);
    blk_queue_io_min(lo->lo_queue, bsize);

    + loop_config_discard(lo);
    loop_update_rotational(lo);
    loop_update_dio(lo);
    loop_sysfs_init(lo);

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