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libnvdimm: allow legacy (e820) pmem region to clear bad blocks 

Bad blocks can be injected via /sys/block/pmemN/badblocks. In a situation
where legacy pmem is being used or a pmem region created by using memmap
kernel parameter, the injected bad blocks are not cleared due to
nvdimm_clear_poison() failing from lack of ndctl function pointer. In
this case we need to just return as handled and allow the bad blocks to
be cleared rather than fail.

Reviewed-by: Vishal Verma <vishal.l.verma@intel.com>
Signed-off-by: Dave Jiang <dave.jiang@intel.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dave Jiang 2016-09-09 09:10:08 -07:00 committed by Dan Williams
parent 2e21807d4b
commit 1e8b8d9619
1 changed files with 5 additions and 1 deletions
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6
drivers/nvdimm/bus.c
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@ -185,8 +185,12 @@ long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
return -ENXIO;
nd_desc = nvdimm_bus->nd_desc;
/*
* if ndctl does not exist, it's PMEM_LEGACY and
* we want to just pretend everything is handled.
*/
if (!nd_desc->ndctl)
return -ENXIO;
return len;
memset(&ars_cap, 0, sizeof(ars_cap));
ars_cap.address = phys;