device-dax: fix sysfs duplicate warnings
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 <jmoyer@redhat.com>
Reported-by: Dariusz Dokupil <dariusz.dokupil@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
diff --git a/drivers/dax/dax.c b/drivers/dax/dax.c
index 586f954..40be3747 100644
--- a/drivers/dax/dax.c
+++ b/drivers/dax/dax.c
@@ -546,7 +546,8 @@
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 @@
}
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 @@
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 @@
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 @@
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);