linux-kernel - Re: [PATCH rdma-next 00/14] Cleanup locking and events in ucma

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Date:   Thu, 27 Aug 2020 08:39:25 -0300
From:   Jason Gunthorpe <jgg@...dia.com>
To:     Leon Romanovsky <leon@...nel.org>
CC:     Doug Ledford <dledford@...hat.com>,
        Leon Romanovsky <leonro@...dia.com>,
        Leon Romanovsky <leonro@...lanox.com>,
        <linux-kernel@...r.kernel.org>, <linux-rdma@...r.kernel.org>,
        Roland Dreier <rolandd@...co.com>,
        Sean Hefty <sean.hefty@...el.com>
Subject: Re: [PATCH rdma-next 00/14] Cleanup locking and events in ucma

On Tue, Aug 18, 2020 at 03:05:12PM +0300, Leon Romanovsky wrote:
> From: Leon Romanovsky <leonro@...dia.com>
> 
> >From Jason:
> 
> Rework how the uevents for new connections are handled so all the locking
> ends up simpler and a work queue can be removed. This should also speed up
> destruction of ucma_context's as a flush_workqueue() was replaced with
> cancel_work_sync().
> 
> The simpler locking comes from narrowing what file->mut covers and moving
> other data to other locks, particularly by injecting the handler_mutex
> from the RDMA CM core as a construct available to ULPs. The handler_mutex
> directly prevents handlers from running without creating any ABBA locking
> problems.
> 
> Fix various error cases and data races caused by missing locking.
> 
> Thanks
> 
> Jason Gunthorpe (14):
>   RDMA/ucma: Fix refcount 0 incr in ucma_get_ctx()
>   RDMA/ucma: Remove unnecessary locking of file->ctx_list in close
>   RDMA/ucma: Consolidate the two destroy flows
>   RDMA/ucma: Fix error cases around ucma_alloc_ctx()
>   RDMA/ucma: Remove mc_list and rely on xarray
>   RDMA/cma: Add missing locking to rdma_accept()
>   RDMA/ucma: Do not use file->mut to lock destroying
>   RDMA/ucma: Fix the locking of ctx->file
>   RDMA/ucma: Fix locking for ctx->events_reported
>   RDMA/ucma: Add missing locking around rdma_leave_multicast()
>   RDMA/ucma: Change backlog into an atomic
>   RDMA/ucma: Narrow file->mut in ucma_event_handler()
>   RDMA/ucma: Rework how new connections are passed through event
>     delivery
>   RDMA/ucma: Remove closing and the close_wq

Applied to for-next

Jason