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From: Jason Gunthorpe <jgunthorpe-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
To: Devesh Sharma <devesh.sharma-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
Cc: Doug Ledford <dledford-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org,
	Yishai Hadas <yishaih-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Subject: Re: [PATCH V4] IB/uverbs: Fix race between uverbs_close and remove_one
Date: Thu, 17 Mar 2016 10:12:37 -0600	[thread overview]
Message-ID: <20160317161237.GB19501@obsidianresearch.com> (raw)
In-Reply-To: <CANjDDBj8aZTeAfwxFuyk9r=kdihfxpxDA69-c4uVxkvcAfXViw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>

On Thu, Mar 17, 2016 at 09:38:30PM +0530, Devesh Sharma wrote:

> To my mind mutex is *not* solving the problem completely unless we
> make it a coarser grained lock. The possible deadlock problem still
> lingers around it.

Review the last version I sent, with this statement in mind:

> > The fundamental thing is that the ib_uverbs_free_hw_resources thread
> > must wait for ib_uverbs_close's ib_uverbs_cleanup_ucontext to finish,
> > if necessary, not the other way around.

It sure doesn't look like it can deadlock...

Jason
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  parent reply	other threads:[~2016-03-17 16:12 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-03-12 15:18 [PATCH V4] IB/uverbs: Fix race between uverbs_close and remove_one Devesh Sharma
     [not found] ` <1457795927-16634-1-git-send-email-devesh.sharma-dY08KVG/lbpWk0Htik3J/w@public.gmane.org>
2016-03-12 20:45   ` Jason Gunthorpe
     [not found]     ` <20160312204502.GA8346-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-03-14  5:40       ` Devesh Sharma
     [not found]         ` <CANjDDBiN8X-Efgp6s2wyT1G6fpQZjdreW0pnnBG71E9jjhy-YA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-03-14 17:48           ` Jason Gunthorpe
     [not found]             ` <20160314174814.GB5240-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-03-15  9:00               ` Devesh Sharma
     [not found]                 ` <CANjDDBhVH10=0nSr0q4P4imAX6YrFBhE7QEd4ccRe2yUhN0pQQ-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-03-15  9:03                   ` Devesh Sharma
2016-03-15 20:31                   ` Jason Gunthorpe
     [not found]                     ` <20160315203112.GA2786-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-03-17 16:08                       ` Devesh Sharma
     [not found]                         ` <CANjDDBj8aZTeAfwxFuyk9r=kdihfxpxDA69-c4uVxkvcAfXViw-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-03-17 16:12                           ` Jason Gunthorpe [this message]
     [not found]                             ` <20160317161237.GB19501-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-03-17 16:31                               ` Devesh Sharma
     [not found]                                 ` <CANjDDBhYH7HsUyP8-Ko7G0tnWxYDGYCGgaC4HK0Eod_isvoWAA-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2016-03-17 16:48                                   ` Jason Gunthorpe
     [not found]                                     ` <20160317164831.GI19501-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-03-21  8:59                                       ` Haggai Eran
2016-04-26 14:33                                       ` Doug Ledford
     [not found]                                         ` <571F7C41.70700-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>
2016-04-26 15:18                                           ` Jason Gunthorpe
     [not found]                                             ` <20160426151851.GC24104-ePGOBjL8dl3ta4EC/59zMFaTQe2KTcn/@public.gmane.org>
2016-04-26 15:27                                               ` Doug Ledford

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