Hi Jens,
Could you add this patch for 4.10?
- Masayoshi Mizuma
On Fri, 2 Dec 2016 14:08:34 +0900 Masayoshi Mizuma wrote:
> bdi_unregister() should be called after bdi_register() is called,
> so we should check whether WB_registered flag is set.
>
> For example of the situation, error path in device driver may call
> blk_cleanup_queue() before the driver calls bdi_register().
>
> Signed-off-by: Masayoshi Mizuma <m.mizuma@xxxxxxxxxxxxxx>
> ---
> mm/backing-dev.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/mm/backing-dev.c b/mm/backing-dev.c
> index 8fde443..f8b07d4 100644
> --- a/mm/backing-dev.c
> +++ b/mm/backing-dev.c
> @@ -853,6 +853,9 @@ static void bdi_remove_from_list(struct backing_dev_info *bdi)
>
> void bdi_unregister(struct backing_dev_info *bdi)
> {
> + if (!test_bit(WB_registered, &bdi->wb.state))
> + return;
> +
> /* make sure nobody finds us on the bdi_list anymore */
> bdi_remove_from_list(bdi);
> wb_shutdown(&bdi->wb);
>
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