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device-dax: fix sysfs duplicate warnings

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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: 98a29c39dc ("libnvdimm, namespace: allow creation of multiple pmem...")
Cc: Jeff Moyer <jmoyer@redhat.com>
Cc: <stable@vger.kernel.org>
Reported-by: Dariusz Dokupil <dariusz.dokupil@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2017-07-18 17:49:14 -07:00
parent 23b9babb50
commit bbb3be170a
3 changed files with 24 additions and 14 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

2
drivers/dax/device-dax.h
View file

@ -21,5 +21,5 @@ struct dax_region *alloc_dax_region(struct device *parent,
int region_id, struct resource *res, unsigned int align,
void *addr, unsigned long flags);
struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
struct resource *res, int count);
int id, struct resource *res, int count);
#endif /* __DEVICE_DAX_H__ */

24
drivers/dax/device.c
View file

@ -529,7 +529,8 @@ static void dev_dax_release(struct device *dev)
struct dax_region *dax_region = dev_dax->region;
struct dax_device *dax_dev = dev_dax->dax_dev;
ida_simple_remove(&dax_region->ida, dev_dax->id);
if (dev_dax->id >= 0)
ida_simple_remove(&dax_region->ida, dev_dax->id);
dax_region_put(dax_region);
put_dax(dax_dev);
kfree(dev_dax);
@ -559,7 +560,7 @@ static void unregister_dev_dax(void *dev)
}
struct dev_dax *devm_create_dev_dax(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_device *dax_dev;
@ -590,10 +591,16 @@ struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
if (i < count)
goto err_id;
dev_dax->id = ida_simple_get(&dax_region->ida, 0, 0, GFP_KERNEL);
if (dev_dax->id < 0) {
rc = dev_dax->id;
goto err_id;
if (id < 0) {
id = ida_simple_get(&dax_region->ida, 0, 0, GFP_KERNEL);
dev_dax->id = id;
if (id < 0) {
rc = id;
goto err_id;
}
} else {
/* region provider owns @id lifetime */
dev_dax->id = -1;
}
/*
@ -625,7 +632,7 @@ struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
dev->parent = parent;
dev->groups = dax_attribute_groups;
dev->release = dev_dax_release;
dev_set_name(dev, "dax%d.%d", dax_region->id, dev_dax->id);
dev_set_name(dev, "dax%d.%d", dax_region->id, id);
rc = cdev_device_add(cdev, dev);
if (rc) {
@ -641,7 +648,8 @@ struct dev_dax *devm_create_dev_dax(struct dax_region *dax_region,
return dev_dax;
err_dax:
ida_simple_remove(&dax_region->ida, dev_dax->id);
if (dev_dax->id >= 0)
ida_simple_remove(&dax_region->ida, dev_dax->id);
err_id:
kfree(dev_dax);

12
drivers/dax/pmem.c
View file

@ -58,13 +58,12 @@ static void dax_pmem_percpu_kill(void *data)
static int dax_pmem_probe(struct device *dev)
{
int rc;
void *addr;
struct resource res;
int rc, id, region_id;
struct nd_pfn_sb *pfn_sb;
struct dev_dax *dev_dax;
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;
@ -123,14 +122,17 @@ static int dax_pmem_probe(struct device *dev)
/* 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... */
dev_dax = devm_create_dev_dax(dax_region, &res, 1);
dev_dax = devm_create_dev_dax(dax_region, id, &res, 1);
/* child dev_dax instances now own the lifetime of the dax_region */
dax_region_put(dax_region);