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Date:   Tue, 6 Mar 2018 09:55:13 -0700
From:   Logan Gunthorpe <logang@...tatee.com>
To:     Oliver O'Halloran <oohall@...il.com>, linux-kernel@...r.kernel.org
Cc:     linux-nvdimm@...ts.01.org, Christoph Hellwig <hch@....de>,
        Dan Williams <dan.j.williams@...el.com>
Subject: Re: [PATCH] kernel/memremap: Remove stale devres_free() call



On 05/03/18 09:56 PM, Oliver O'Halloran wrote:
> devm_memremap_pages() was re-worked in e8d513483300 to take a caller
> allocated struct dev_pagemap as a function parameter. A call to
> devres_free() was left in the error cleanup path which results in
> a kernel panic if the remap fails for some reason. Remove it
> to fix the panic and let devm_memremap_pages() fail gracefully.
> 
> Fixes: e8d513483300 ("memremap: change devm_memremap_pages interface to use struct dev_pagemap")
> Cc: Logan Gunthorpe <logang@...tatee.com>
> Cc: Christoph Hellwig <hch@....de>
> Cc: Dan Williams <dan.j.williams@...el.com>
> Signed-off-by: Oliver O'Halloran <oohall@...il.com>

Reviewed-by: Logan Gunthorpe <logang@...tatee.com>

> ---
> Both in-tree users of devm_memremap_pages() embed dev_pagemap into other
> structures so this shouldn't cause any leaks. Logan's p2p series does
> add one usage that assumes pgmap will be freed on error so that'll
> need fixing.

Yup, nice catch! I'll fix that for the next series.

Thanks,

Logan

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