linux-kernel - [PATCH AUTOSEL 5.7 26/28] nvdimm/region: always show the 'align' attribute

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Date:   Tue, 23 Jun 2020 13:35:21 -0400
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Vishal Verma <vishal.l.verma@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Sasha Levin <sashal@...nel.org>, linux-nvdimm@...ts.01.org
Subject: [PATCH AUTOSEL 5.7 26/28] nvdimm/region: always show the 'align' attribute

From: Vishal Verma <vishal.l.verma@...el.com>

[ Upstream commit 543094e19c82b5d171e139d09a1a3ea0a7361117 ]

It is possible that a platform that is capable of 'namespace labels'
comes up without the labels properly initialized. In this case, the
region's 'align' attribute is hidden. Howerver, once the user does
initialize he labels, the 'align' attribute still stays hidden, which is
unexpected.

The sysfs_update_group() API is meant to address this, and could be
called during region probe, but it has entanglements with the device
'lockdep_mutex'. Therefore, simply make the 'align' attribute always
visible. It doesn't matter what it says for label-less namespaces, since
it is not possible to change their allocation anyway.

Suggested-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Vishal Verma <vishal.l.verma@...el.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Link: https://lore.kernel.org/r/20200520225026.29426-1-vishal.l.verma@intel.com
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/nvdimm/region_devs.c | 14 ++------------
 1 file changed, 2 insertions(+), 12 deletions(-)

diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c
index ccbb5b43b8b2c..4502f9c4708d0 100644
--- a/drivers/nvdimm/region_devs.c
+++ b/drivers/nvdimm/region_devs.c
@@ -679,18 +679,8 @@ static umode_t region_visible(struct kobject *kobj, struct attribute *a, int n)
 		return a->mode;
 	}
 
-	if (a == &dev_attr_align.attr) {
-		int i;
-
-		for (i = 0; i < nd_region->ndr_mappings; i++) {
-			struct nd_mapping *nd_mapping = &nd_region->mapping[i];
-			struct nvdimm *nvdimm = nd_mapping->nvdimm;
-
-			if (test_bit(NDD_LABELING, &nvdimm->flags))
-				return a->mode;
-		}
-		return 0;
-	}
+	if (a == &dev_attr_align.attr)
+		return a->mode;
 
 	if (a != &dev_attr_set_cookie.attr
 			&& a != &dev_attr_available_size.attr)
-- 
2.25.1