From: Dan Williams <dan.j.williams@intel.com>
Date: Tue, 19 Dec 2017 15:07:10 -0800
Subject: libnvdimm, pfn: fix start_pad handling for aligned namespaces
Patch-mainline: v4.15-rc5
Git-commit: 19deaa217bc04e83b59b5e8c8229eb0e53ad9efc
References: FATE#323731

The alignment checks at pfn driver startup fail to properly account for
the 'start_pad' in the case where the namespace is misaligned relative
to its internal alignment. This is typically triggered in 1G aligned
namespace, but could theoretically trigger with small namespace
alignments. When this triggers the kernel reports messages of the form:

    dax2.1: bad offset: 0x3c000000 dax disabled align: 0x40000000

Cc: <stable@vger.kernel.org>
Fixes: 1ee6667cd8d1 ("libnvdimm, pfn, dax: fix initialization vs autodetect...")
Reported-by: Jane Chu <jane.chu@oracle.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Johannes Thumshirn <jthumshirn@suse.de>
---
 drivers/nvdimm/pfn_devs.c |    5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -352,9 +352,9 @@ struct device *nd_pfn_create(struct nd_r
 int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
 {
 	u64 checksum, offset;
-	unsigned long align;
 	enum nd_pfn_mode mode;
 	struct nd_namespace_io *nsio;
+	unsigned long align, start_pad;
 	struct nd_pfn_sb *pfn_sb = nd_pfn->pfn_sb;
 	struct nd_namespace_common *ndns = nd_pfn->ndns;
 	const u8 *parent_uuid = nd_dev_to_uuid(&ndns->dev);
@@ -398,6 +398,7 @@ int nd_pfn_validate(struct nd_pfn *nd_pf
 
 	align = le32_to_cpu(pfn_sb->align);
 	offset = le64_to_cpu(pfn_sb->dataoff);
+	start_pad = le32_to_cpu(pfn_sb->start_pad);
 	if (align == 0)
 		align = 1UL << ilog2(offset);
 	mode = le32_to_cpu(pfn_sb->mode);
@@ -456,7 +457,7 @@ int nd_pfn_validate(struct nd_pfn *nd_pf
 		return -EBUSY;
 	}
 
-	if ((align && !IS_ALIGNED(offset, align))
+	if ((align && !IS_ALIGNED(nsio->res.start + offset + start_pad, align))
 			|| !IS_ALIGNED(offset, PAGE_SIZE)) {
 		dev_err(&nd_pfn->dev,
 				"bad offset: %#llx dax disabled align: %#lx\n",