linux-kernel - Re: [PATCH v2] dax: fix NULL pointer in __dax_pmd

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Message-ID: <5603B938.1@plexistor.com>
Date:	Thu, 24 Sep 2015 11:50:00 +0300
From:	Boaz Harrosh <boaz@...xistor.com>
To:	Dave Chinner <david@...morbit.com>,
	Dan Williams <dan.j.williams@...el.com>
CC:	linux-nvdimm <linux-nvdimm@...1.01.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Alexander Viro <viro@...iv.linux.org.uk>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	"Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Subject: Re: [PATCH v2] dax: fix NULL pointer in __dax_pmd_fault()

On 09/23/2015 12:04 PM, Dave Chinner wrote:
> On Tue, Sep 22, 2015 at 08:00:29PM -0700, Dan Williams wrote:
<>
>> The kaddr is coming from the devm_memremap() in the pmem driver that
>> gets unmapped after the device is released by the driver.
> 
> Perhaps the better solution is to not tear down the block device
> until all active references have gone away? i.e. unbind puts the
> device into a persistent error state and forces all active mappings
> to refault. Hence all future accesses error out and then when the
> user unmounts the unhappy filesystem the last reference to the
> blockdev goes away and the mappings can be torn down safely...
> 

Me too

> Cheers,
> 
> Dave.
> 

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