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libnvdimm: Fix nvdimm_probe error on NVDIMM-N

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'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 <[email protected]>
Signed-off-by: Toshi Kani <[email protected]>
Cc: Dan Williams <[email protected]>
Tested-by: Johannes Thumshirn <[email protected]>
Acked-by: Johannes Thumshirn <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
This commit is contained in:
Toshi Kani 2016-08-16 13:08:40 -06:00 • committed by Dan Williams
commit aee6598748
3 changed files with 27 additions and 13 deletions
Download patch file Download diff file Expand all files Collapse all files

11
drivers/nvdimm/dimm.c
View file

@ -26,6 +26,14 @@ static int nvdimm_probe(struct device *dev)
struct nvdimm_drvdata *ndd;
int rc;
rc = nvdimm_check_config_data(dev);
if (rc) {
/* not required for non-aliased nvdimm, ex. NVDIMM-N */
if (rc == -ENOTTY)
rc = 0;
return rc;
}
ndd = kzalloc(sizeof(*ndd), GFP_KERNEL);
if (!ndd)
return -ENOMEM;
@ -72,6 +80,9 @@ static int nvdimm_remove(struct device *dev)
{
struct nvdimm_drvdata *ndd = dev_get_drvdata(dev);
if (!ndd)
return 0;
nvdimm_bus_lock(dev);
dev_set_drvdata(dev, NULL);
nvdimm_bus_unlock(dev);

28
drivers/nvdimm/dimm_devs.c
View file

@ -28,28 +28,30 @@ static DEFINE_IDA(dimm_ida);
* 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;

1
drivers/nvdimm/nd.h
View file

@ -191,6 +191,7 @@ void nvdimm_exit(void);
void nd_region_exit(void);
struct nvdimm;
struct nvdimm_drvdata *to_ndd(struct nd_mapping *nd_mapping);
int nvdimm_check_config_data(struct device *dev);
int nvdimm_init_nsarea(struct nvdimm_drvdata *ndd);
int nvdimm_init_config_data(struct nvdimm_drvdata *ndd);
int nvdimm_set_config_data(struct nvdimm_drvdata *ndd, size_t offset,