archive mirror
 help / color / mirror / Atom feed
From: Dan Williams <>
Cc: "Aneesh Kumar K.V" <>,,
Subject: [PATCH v4 2/5] libnvdimm/pfn: Prevent raw mode fallback if pfn-infoblock valid
Date: Tue, 03 Mar 2020 18:08:13 -0800	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

The EOPNOTSUPP return code from the pmem driver indicates that the
namespace has a configuration that may be valid, but the current kernel
does not support it. Expand this to all of the nd_pfn_validate() error
conditions after the infoblock has been verified as self consistent.

This prevents exposing the namespace to I/O when the infoblock needs to
be corrected, or the system needs to be put into a different
configuration (like changing the page size on PowerPC).

Cc: Aneesh Kumar K.V <>
Cc: Jeff Moyer <>
Reviewed-by: Aneesh Kumar K.V <>
Signed-off-by: Dan Williams <>
 drivers/nvdimm/pfn_devs.c |    8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/nvdimm/pfn_devs.c b/drivers/nvdimm/pfn_devs.c
index a5c25cb87116..79fe02d6f657 100644
--- a/drivers/nvdimm/pfn_devs.c
+++ b/drivers/nvdimm/pfn_devs.c
@@ -561,14 +561,14 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
 			dev_dbg(&nd_pfn->dev, "align: %lx:%lx mode: %d:%d\n",
 					nd_pfn->align, align, nd_pfn->mode,
-			return -EINVAL;
+			return -EOPNOTSUPP;
 	if (align > nvdimm_namespace_capacity(ndns)) {
 		dev_err(&nd_pfn->dev, "alignment: %lx exceeds capacity %llx\n",
 				align, nvdimm_namespace_capacity(ndns));
-		return -EINVAL;
+		return -EOPNOTSUPP;
@@ -581,7 +581,7 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
 	if (offset >= resource_size(&nsio->res)) {
 		dev_err(&nd_pfn->dev, "pfn array size exceeds capacity of %s\n",
-		return -EBUSY;
+		return -EOPNOTSUPP;
 	if ((align && !IS_ALIGNED(nsio->res.start + offset + start_pad, align))
@@ -589,7 +589,7 @@ int nd_pfn_validate(struct nd_pfn *nd_pfn, const char *sig)
 				"bad offset: %#llx dax disabled align: %#lx\n",
 				offset, align);
-		return -ENXIO;
+		return -EOPNOTSUPP;
 	return 0;
Linux-nvdimm mailing list --
To unsubscribe send an email to

  parent reply	other threads:[~2020-03-04  2:24 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-04  2:08 [PATCH v4 0/5] libnvdimm: Cross-arch compatible namespace alignment Dan Williams
2020-03-04  2:08 ` [PATCH v4 1/5] mm/memremap_pages: Introduce memremap_compat_align() Dan Williams
2020-03-12  3:17   ` Michael Ellerman
2020-03-04  2:08 ` Dan Williams [this message]
2020-03-04  2:08 ` [PATCH v4 3/5] libnvdimm/namespace: Enforce memremap_compat_align() Dan Williams
2020-03-04  2:08 ` [PATCH v4 4/5] libnvdimm/region: Introduce NDD_LABELING Dan Williams
2020-03-04  2:08 ` [PATCH v4 5/5] libnvdimm/region: Introduce an 'align' attribute Dan Williams

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \ \ \ \ \ \ \

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).