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Commit aee65987 authored by Toshi Kani's avatar Toshi Kani Committed by Dan Williams
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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: default avatarBrian Boylston <brian.boylston@hpe.com>
Signed-off-by: default avatarToshi Kani <toshi.kani@hpe.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Tested-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Acked-by: default avatarJohannes Thumshirn <jthumshirn@suse.de>
Signed-off-by: default avatarDan Williams <dan.j.williams@intel.com>
parent ae551e9c

drivers/nvdimm/dimm.c

+11 −0
Original line number Diff line number Diff line
@@ -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);

drivers/nvdimm/dimm_devs.c

+15 −13
Original line number Diff line number Diff line
@@ -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;



	if (!ndd)

		return -EINVAL;



	nvdimm = to_nvdimm(ndd->dev);

	struct nvdimm *nvdimm = to_nvdimm(dev);



	if (!nvdimm->cmd_mask)

		return -ENXIO;

	if (!test_bit(ND_CMD_GET_CONFIG_DATA, &nvdimm->cmd_mask))

	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 (!ndd)

		return -EINVAL;



	if (rc && ndd)

	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;

drivers/nvdimm/nd.h

+1 −0
Original line number Diff line number Diff line
@@ -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,