libnvdimm: Fix nvdimm_probe error on NVDIMM-N
'ndctl list --buses --dimms' does not list any NVDIMM-Ns since
they are considered as idle. ndctl checks if any driver is
attached to nmem device. nvdimm_probe() always fails in
nvdimm_init_nsarea() since NVDIMM-Ns do not implement optinal
ND_CMD_GET_CONFIG_DATA command.
Change nvdimm_probe() to accept the case that the CONFIG_DATA
command is not implemented for NVDIMM-Ns. The driver attaches
without ndd, which keeps it no-op to the device.
Reported-by: Brian Boylston <brian.boylston@hpe.com>
Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Tested-by: Johannes Thumshirn <jthumshirn@suse.de>
Acked-by: Johannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
diff --git a/drivers/nvdimm/dimm_devs.c b/drivers/nvdimm/dimm_devs.c
index ce75cc3..cf36470 100644
--- a/drivers/nvdimm/dimm_devs.c
+++ b/drivers/nvdimm/dimm_devs.c
@@ -28,28 +28,30 @@
* Retrieve bus and dimm handle and return if this bus supports
* get_config_data commands
*/
-static int __validate_dimm(struct nvdimm_drvdata *ndd)
+int nvdimm_check_config_data(struct device *dev)
{
- struct nvdimm *nvdimm;
+ struct nvdimm *nvdimm = to_nvdimm(dev);
- if (!ndd)
- return -EINVAL;
-
- nvdimm = to_nvdimm(ndd->dev);
-
- if (!nvdimm->cmd_mask)
- return -ENXIO;
- if (!test_bit(ND_CMD_GET_CONFIG_DATA, &nvdimm->cmd_mask))
- return -ENXIO;
+ if (!nvdimm->cmd_mask ||
+ !test_bit(ND_CMD_GET_CONFIG_DATA, &nvdimm->cmd_mask)) {
+ if (nvdimm->flags & NDD_ALIASING)
+ return -ENXIO;
+ else
+ return -ENOTTY;
+ }
return 0;
}
static int validate_dimm(struct nvdimm_drvdata *ndd)
{
- int rc = __validate_dimm(ndd);
+ int rc;
- if (rc && ndd)
+ if (!ndd)
+ return -EINVAL;
+
+ rc = nvdimm_check_config_data(ndd->dev);
+ if (rc)
dev_dbg(ndd->dev, "%pf: %s error: %d\n",
__builtin_return_address(0), __func__, rc);
return rc;