On Tue, Dec 15, 2015 at 5:56 PM, Mike Krinkin <krinkin....@gmail.com> wrote:
> blk_end_request_all may free request, so we need to save
> request_queue pointer before blk_end_request_all call.
>
> The problem was introduced in commit cf8ecc5a8455266f8d51
> ("null_blk: guarantee device restart in all irq modes")
> and causes general protection fault with slab poisoning
> enabled.
>
> Fixes: cf8ecc5a8455266f8d51 ("null_blk: guarantee device
> restart in all irq modes")
>
> Signed-off-by: Mike Krinkin <krinkin....@gmail.com>
Reviewed-by: Ming Lei <tom.leim...@gmail.com>
> ---
> drivers/block/null_blk.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/block/null_blk.c b/drivers/block/null_blk.c
> index 36c4651..6a06e3e 100644
> --- a/drivers/block/null_blk.c
> +++ b/drivers/block/null_blk.c
> @@ -219,6 +219,9 @@ static void end_cmd(struct nullb_cmd *cmd)
> {
> struct request_queue *q = NULL;
>
> + if (cmd->rq)
> + q = cmd->rq->q;
> +
> switch (queue_mode) {
> case NULL_Q_MQ:
> blk_mq_end_request(cmd->rq, 0);
> @@ -232,9 +235,6 @@ static void end_cmd(struct nullb_cmd *cmd)
> goto free_cmd;
> }
>
> - if (cmd->rq)
> - q = cmd->rq->q;
> -
> /* Restart queue if needed, as we are freeing a tag */
> if (q && !q->mq_ops && blk_queue_stopped(q)) {
> unsigned long flags;
> --
> 1.9.1
>
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--
Ming Lei
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