linux-kernel - Re: [PATCH] IB/sa: replace GFP_KERNEL with GFP

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Message-ID: <20151027200012.GA7403@obsidianresearch.com>
Date:	Tue, 27 Oct 2015 14:00:12 -0600
From:	Jason Gunthorpe <jgunthorpe@...idianresearch.com>
To:	"Wan, Kaike" <kaike.wan@...el.com>
Cc:	"Weiny, Ira" <ira.weiny@...el.com>,
	Saurabh Sengar <saurabh.truth@...il.com>,
	"dledford@...hat.com" <dledford@...hat.com>,
	"Hefty, Sean" <sean.hefty@...el.com>,
	"hal.rosenstock@...il.com" <hal.rosenstock@...il.com>,
	"yun.wang@...fitbricks.com" <yun.wang@...fitbricks.com>,
	"linux-rdma@...r.kernel.org" <linux-rdma@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] IB/sa: replace GFP_KERNEL with GFP_ATOMIC

On Tue, Oct 27, 2015 at 06:56:50PM +0000, Wan, Kaike wrote:
 
> > I do wonder if it is a good idea to call ib_nl_send_msg with a spinlock held
> > though.. Would be nice to see that go away.
> 
> We have to hold the lock to protect against a race condition that a
> quick response will try to free the request from the
> ib_nl_request_list before we even put it on the list.

Put is on the list first? Use a kref? Doesn't look like a big deal to
clean this up.

Jason
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