netdev - Re: [PATCH] mlx4: prevent the device from being removed concurrently

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Message-Id: <20120228.143051.352474620462899753.davem@davemloft.net>
Date:	Tue, 28 Feb 2012 14:30:51 -0500 (EST)
From:	David Miller <davem@...emloft.net>
To:	cascardo@...ux.vnet.ibm.com
Cc:	yevgenyp@...lanox.co.il, netdev@...r.kernel.org,
	linux-rdma@...r.kernel.org, roland@...estorage.com
Subject: Re: [PATCH] mlx4: prevent the device from being removed
 concurrently

From: Thadeu Lima de Souza Cascardo <cascardo@...ux.vnet.ibm.com>
Date: Tue, 28 Feb 2012 15:36:16 -0300

> When a EEH happens, the catas poll code will try to restart the device,
> removing it and adding it back again. The EEH code will try to do the
> same. One of the threads ends up accessing memory that was freed by the
> other thread and we get a crash.

Stop adding bandaids to the locking.

If the EEH infrastructure doesn't synchronize parallel operations
on the same device, that is the real bug, and that's where the real
fix belongs.

I refuse to apply this patch.
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