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authorDan Williams <dan.j.williams@intel.com>2016-11-28 11:15:18 -0800
committerDan Williams <dan.j.williams@intel.com>2016-11-28 11:15:18 -0800
commit450c6633e874c4d38112b39647831f67b41a8067 (patch)
treeb2d9813afd5677de59c2070940796f04af3abbce /drivers/dax
parent2d9a02744f5a2e8325fc0c3e5533593261cead0a (diff)
downloadlinux-450c6633e874c4d38112b39647831f67b41a8067.tar.bz2
libnvdimm: use consistent naming for request_mem_region()
Here is an example /proc/iomem listing for a system with 2 namespaces, one in "sector" mode and one in "memory" mode: 1fc000000-2fbffffff : Persistent Memory (legacy) 1fc000000-2fbffffff : namespace1.0 340000000-34fffffff : Persistent Memory 340000000-34fffffff : btt0.1 Here is the corresponding ndctl listing: # ndctl list [ { "dev":"namespace1.0", "mode":"memory", "size":4294967296, "blockdev":"pmem1" }, { "dev":"namespace0.0", "mode":"sector", "size":267091968, "uuid":"f7594f86-badb-4592-875f-ded577da2eaf", "sector_size":4096, "blockdev":"pmem0s" } ] Notice that the ndctl listing is purely in terms of namespace devices, while the iomem listing leaks the internal "btt0.1" implementation detail. Given that ndctl requires the namespace device name to change the mode, for example: # ndctl create-namespace --reconfig=namespace0.0 --mode=raw --force ...use the namespace name in the iomem listing to keep the claiming device name consistent across different mode settings. Cc: Vishal Verma <vishal.l.verma@intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Diffstat (limited to 'drivers/dax')
-rw-r--r--drivers/dax/pmem.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/dax/pmem.c b/drivers/dax/pmem.c
index 9630d8837ba9..3ff84784249a 100644
--- a/drivers/dax/pmem.c
+++ b/drivers/dax/pmem.c
@@ -87,7 +87,8 @@ static int dax_pmem_probe(struct device *dev)
pfn_sb = nd_pfn->pfn_sb;
if (!devm_request_mem_region(dev, nsio->res.start,
- resource_size(&nsio->res), dev_name(dev))) {
+ resource_size(&nsio->res),
+ dev_name(&ndns->dev))) {
dev_warn(dev, "could not reserve region %pR\n", &nsio->res);
return -EBUSY;
}