linux-kernel - [PATCH v2 10/18] dax: Simplify root read-only definition for the 'resource' attribute

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Message-ID: <157401272766.43284.6942797624123280468.stgit@dwillia2-desk3.amr.corp.intel.com>
Date:   Sun, 17 Nov 2019 09:45:27 -0800
From:   Dan Williams <dan.j.williams@...el.com>
To:     linux-nvdimm@...ts.01.org
Cc:     Ira Weiny <ira.weiny@...el.com>,
        Vishal Verma <vishal.l.verma@...el.com>,
        "Aneesh Kumar K.V" <aneesh.kumar@...ux.ibm.com>,
        peterz@...radead.org, dave.hansen@...ux.intel.com, hch@....de,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-acpi@...r.kernel.org
Subject: [PATCH v2 10/18] dax: Simplify root read-only definition for the
 'resource' attribute

Rather than update the permission in ->is_visible() set the permission
directly at declaration time.

Cc: Ira Weiny <ira.weiny@...el.com>
Cc: Vishal Verma <vishal.l.verma@...el.com>
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@...ux.ibm.com>
Link: https://lore.kernel.org/r/157309904959.1582359.7281180042781955506.stgit@dwillia2-desk3.amr.corp.intel.com
---
 drivers/dax/bus.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

diff --git a/drivers/dax/bus.c b/drivers/dax/bus.c
index f3e6e00ece40..ce6d648d7670 100644
--- a/drivers/dax/bus.c
+++ b/drivers/dax/bus.c
@@ -309,7 +309,7 @@ static ssize_t resource_show(struct device *dev,
 
 	return sprintf(buf, "%#llx\n", dev_dax_resource(dev_dax));
 }
-static DEVICE_ATTR_RO(resource);
+static DEVICE_ATTR(resource, 0400, resource_show, NULL);
 
 static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
 		char *buf)
@@ -329,8 +329,6 @@ static umode_t dev_dax_visible(struct kobject *kobj, struct attribute *a, int n)
 
 	if (a == &dev_attr_target_node.attr && dev_dax_target_node(dev_dax) < 0)
 		return 0;
-	if (a == &dev_attr_resource.attr)
-		return 0400;
 	return a->mode;
 }