linux-kernel - [PATCH] pmem: fix badblocks population for raw mode

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Date:   Wed, 25 Apr 2018 10:11:25 -0600
From:   Toshi Kani <toshi.kani@....com>
To:     dan.j.williams@...el.com
Cc:     linux-nvdimm@...ts.01.org, linux-kernel@...r.kernel.org,
        Toshi Kani <toshi.kani@....com>,
        Christoph Hellwig <hch@....de>, stable@...r.kernel.org
Subject: [PATCH] pmem: fix badblocks population for raw mode

pmem_attach_disk() calls nvdimm_badblocks_populate() with resource
range uninitialized in the case of raw mode.  This leads the pmem
driver to hit MCE despite of ARS reporting the range bad.

Initialize 'bb_res' for raw mode.

Fixes: e8d513483300 ("memremap: change devm_memremap_pages interface to use struct dev_pagemap")
Signed-off-by: Toshi Kani <toshi.kani@....com>
Cc: Christoph Hellwig <hch@....de>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: <stable@...r.kernel.org>
---
 drivers/nvdimm/pmem.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 9d714926ecf5..2d7875209bce 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -367,9 +367,11 @@ static int pmem_attach_disk(struct device *dev,
 		addr = devm_memremap_pages(dev, &pmem->pgmap);
 		pmem->pfn_flags |= PFN_MAP;
 		memcpy(&bb_res, &pmem->pgmap.res, sizeof(bb_res));
-	} else
+	} else {
 		addr = devm_memremap(dev, pmem->phys_addr,
 				pmem->size, ARCH_MEMREMAP_PMEM);
+		memcpy(&bb_res, res, sizeof(bb_res));
+	}
 
 	/*
 	 * At release time the queue must be frozen before