For ublk servers with many ublk queues, accessing the ublk_queue in ublk_ch_{read,write}_iter() is a frequent cache miss. Get the flags and queue depth from the ublk_device instead, which is accessed just before. Signed-off-by: Caleb Sander Mateos --- drivers/block/ublk_drv.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/block/ublk_drv.c b/drivers/block/ublk_drv.c index 58f688eac742..d6d8dcb72e4b 100644 --- a/drivers/block/ublk_drv.c +++ b/drivers/block/ublk_drv.c @@ -2525,14 +2525,14 @@ static struct request *ublk_check_and_get_req(struct kiocb *iocb, if (q_id >= ub->dev_info.nr_hw_queues) return ERR_PTR(-EINVAL); ubq = ublk_get_queue(ub, q_id); - if (!ublk_support_user_copy(ubq)) + if (!ublk_dev_support_user_copy(ub)) return ERR_PTR(-EACCES); - if (tag >= ubq->q_depth) + if (tag >= ub->dev_info.queue_depth) return ERR_PTR(-EINVAL); *io = &ubq->ios[tag]; req = __ublk_check_and_get_req(ub, ubq, *io, buf_off); if (!req) -- 2.45.2