Patch "device-dax: fix sysfs duplicate warnings" has been added to the 4.9-stable tree

PATCH [email protected] 1 participant 1 message Aug 4, 2017

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2017-08-04 20:04 UTC #0 lore raw

This is a note to let you know that I've just added the patch titled

device-dax: fix sysfs duplicate warnings

to the 4.9-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
device-dax-fix-sysfs-duplicate-warnings.patch
and it can be found in the queue-4.9 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree, please let <[email protected]> know about it.

Quoted 1 line

From bbb3be170ac2891526ad07b18af7db226879a8e7 Mon Sep 17 00:00:00 2001

From: Dan Williams <[email protected]>
Date: Tue, 18 Jul 2017 17:49:14 -0700
Subject: device-dax: fix sysfs duplicate warnings

From: Dan Williams <[email protected]>

commit bbb3be170ac2891526ad07b18af7db226879a8e7 upstream.

Fix warnings of the form...

     WARNING: CPU: 10 PID: 4983 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x62/0x80
     sysfs: cannot create duplicate filename '/class/dax/dax12.0'
     Call Trace:
      dump_stack+0x63/0x86
      __warn+0xcb/0xf0
      warn_slowpath_fmt+0x5a/0x80
      ? kernfs_path_from_node+0x4f/0x60
      sysfs_warn_dup+0x62/0x80
      sysfs_do_create_link_sd.isra.2+0x97/0xb0
      sysfs_create_link+0x25/0x40
      device_add+0x266/0x630
      devm_create_dax_dev+0x2cf/0x340 [dax]
      dax_pmem_probe+0x1f5/0x26e [dax_pmem]
      nvdimm_bus_probe+0x71/0x120

...by reusing the namespace id for the device-dax instance name.

Now that we have decided that there will never by more than one device-dax instance per libnvdimm-namespace parent device [1], we can directly reuse the namepace ids. There are some possible follow-on cleanups, but those are saved for a later patch to simplify the -stable backport.

[1]: https://lists.01.org/pipermail/linux-nvdimm/2016-December/008266.html

Fixes 98a29c39dc68 ("libnvdimm, namespace: allow creation of multiple pmem...")

Cc Jeff Moyer <[email protected]>

Reported-by Dariusz Dokupil <[email protected]>

Signed-off-by Dan Williams <[email protected]>

Signed-off-by Greg Kroah-Hartman <[email protected]>

---
 drivers/dax/dax.c  |   24 ++++++++++++++++--------
 drivers/dax/dax.h  |    2 +-
 drivers/dax/pmem.c |   12 +++++++-----
 3 files changed, 24 insertions(+), 14 deletions(-)

drivers/dax/dax.c +16 -8

@@ -546,7 +546,8 @@ static void dax_dev_release(struct devic
 	struct dax_dev *dax_dev = to_dax_dev(dev);
 	struct dax_region *dax_region = dax_dev->region;
 
-	ida_simple_remove(&dax_region->ida, dax_dev->id);
+	if (dax_dev->id >= 0)
+		ida_simple_remove(&dax_region->ida, dax_dev->id);
 	ida_simple_remove(&dax_minor_ida, MINOR(dev->devt));
 	dax_region_put(dax_region);
 	iput(dax_dev->inode);

@@ -581,7 +582,7 @@ static void unregister_dax_dev(void *dev
 }
 
 struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
-		struct resource *res, int count)
+		int id, struct resource *res, int count)
 {
 	struct device *parent = dax_region->dev;
 	struct dax_dev *dax_dev;

@@ -608,10 +609,16 @@ struct dax_dev *devm_create_dax_dev(stru
 	if (i < count)
 		goto err_id;
 
-	dax_dev->id = ida_simple_get(&dax_region->ida, 0, 0, GFP_KERNEL);
-	if (dax_dev->id < 0) {
-		rc = dax_dev->id;
-		goto err_id;
+	if (id < 0) {
+		id = ida_simple_get(&dax_region->ida, 0, 0, GFP_KERNEL);
+		dax_dev->id = id;
+		if (id < 0) {
+			rc = id;
+			goto err_id;
+		}
+	} else {
+		/* region provider owns @id lifetime */
+		dax_dev->id = -1;
 	}
 
 	minor = ida_simple_get(&dax_minor_ida, 0, 0, GFP_KERNEL);

@@ -650,7 +657,7 @@ struct dax_dev *devm_create_dax_dev(stru
 	dev->parent = parent;
 	dev->groups = dax_attribute_groups;
 	dev->release = dax_dev_release;
-	dev_set_name(dev, "dax%d.%d", dax_region->id, dax_dev->id);
+	dev_set_name(dev, "dax%d.%d", dax_region->id, id);
 	rc = device_add(dev);
 	if (rc) {
 		kill_dax_dev(dax_dev);

@@ -669,7 +676,8 @@ struct dax_dev *devm_create_dax_dev(stru
  err_inode:
 	ida_simple_remove(&dax_minor_ida, minor);
  err_minor:
-	ida_simple_remove(&dax_region->ida, dax_dev->id);
+	if (dax_dev->id >= 0)
+		ida_simple_remove(&dax_region->ida, dax_dev->id);
  err_id:
 	kfree(dax_dev);

drivers/dax/dax.h +1 -1

@@ -21,5 +21,5 @@ struct dax_region *alloc_dax_region(stru
 		int region_id, struct resource *res, unsigned int align,
 		void *addr, unsigned long flags);
 struct dax_dev *devm_create_dax_dev(struct dax_region *dax_region,
-		struct resource *res, int count);
+		int id, struct resource *res, int count);
 #endif /* __DAX_H__ */

drivers/dax/pmem.c +7 -5

@@ -58,13 +58,12 @@ static void dax_pmem_percpu_kill(void *d
 
 static int dax_pmem_probe(struct device *dev)
 {
-	int rc;
 	void *addr;
 	struct resource res;
 	struct dax_dev *dax_dev;
+	int rc, id, region_id;
 	struct nd_pfn_sb *pfn_sb;
 	struct dax_pmem *dax_pmem;
-	struct nd_region *nd_region;
 	struct nd_namespace_io *nsio;
 	struct dax_region *dax_region;
 	struct nd_namespace_common *ndns;

@@ -122,14 +121,17 @@ static int dax_pmem_probe(struct device
 	/* adjust the dax_region resource to the start of data */
 	res.start += le64_to_cpu(pfn_sb->dataoff);
 
-	nd_region = to_nd_region(dev->parent);
-	dax_region = alloc_dax_region(dev, nd_region->id, &res,
+	rc = sscanf(dev_name(&ndns->dev), "namespace%d.%d", &region_id, &id);
+	if (rc != 2)
+		return -EINVAL;
+
+	dax_region = alloc_dax_region(dev, region_id, &res,
 			le32_to_cpu(pfn_sb->align), addr, PFN_DEV|PFN_MAP);
 	if (!dax_region)
 		return -ENOMEM;
 
 	/* TODO: support for subdividing a dax region... */
-	dax_dev = devm_create_dax_dev(dax_region, &res, 1);
+	dax_dev = devm_create_dax_dev(dax_region, id, &res, 1);
 
 	/* child dax_dev instances now own the lifetime of the dax_region */
 	dax_region_put(dax_region);

Patches currently in stable-queue which might be from [email protected] are

queue-4.9/device-dax-fix-sysfs-duplicate-warnings.patch