Re: [PATCH 6.1 -stable] ublk: remove check IO_URING_F_SQE128 in ublk_ch_uring_cmd

[Greg Kroah-Hartman <gregkh@linuxfoundation.org>]

On Thu, Aug 24, 2023 at 01:22:03PM +0800, Ming Lei wrote:
> commit 9c7c4bc986932218fd0df9d2a100509772028fb1 upstream
> 
> sizeof(struct ublksrv_io_cmd) is 16bytes, which can be held in 64byte SQE,
> so not necessary to check IO_URING_F_SQE128.
> 
> With this change, we get chance to save half SQ ring memory.
> 
> Fixed: 71f28f3136af ("ublk_drv: add io_uring based userspace block driver")
> Signed-off-by: Ming Lei <ming.lei@redhat.com>
> Link: https://lore.kernel.org/r/20230220041413.1524335-1-ming.lei@redhat.com
> Signed-off-by: Jens Axboe <axboe@kernel.dk>
> ---
>  drivers/block/ublk_drv.c | 3 ---
>  1 file changed, 3 deletions(-)
> 
> diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c
> index f48d213fb65e..09d29fa53939 100644
> --- a/drivers/block/ublk_drv.c
> +++ b/drivers/block/ublk_drv.c
> @@ -1271,9 +1271,6 @@ static int ublk_ch_uring_cmd(struct io_uring_cmd *cmd, unsigned int issue_flags)
>  			__func__, cmd->cmd_op, ub_cmd->q_id, tag,
>  			ub_cmd->result);
>  
> -	if (!(issue_flags & IO_URING_F_SQE128))
> -		goto out;
> -
>  	if (ub_cmd->q_id >= ub->dev_info.nr_hw_queues)
>  		goto out;
>  
> -- 
> 2.40.1
> 

Now queued up, thanks.

greg k-h