[PATCH 2/2] libnvdimm: clear region badblock in nvdimm_clear_poison()

[Toshi Kani]

Badblocks are tracked at both region and device levels.
pmem_clear_poison() and nsio_rw_bytes() call nvdimm_clear_poison()
and then badblocks_clear() to clear badblocks at the device level.
However, it does not update badblocks at the region level, which
makes them inconsistent.

Change nvdimm_clear_poison() to update backblocks at the region
level to keep them consistent.

Signed-off-by: Toshi Kani <toshi.k...@hpe.com>
Cc: Dan Williams <dan.j.willi...@intel.com>
Cc: Dave Jiang <dave.ji...@intel.com>
Cc: Vishal Verma <vishal.l.ve...@intel.com>
---
Based on 'libnvdimm-for-next'.
---
 drivers/nvdimm/bus.c |    9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index 43ddfd4..998332d 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -179,6 +179,7 @@ long nvdimm_clear_poison(struct device *dev, phys_addr_t 
phys,
        struct nvdimm_bus_descriptor *nd_desc;
        struct nd_cmd_clear_error clear_err;
        struct nd_cmd_ars_cap ars_cap;
+       struct resource res;
        u32 clear_err_unit, mask;
        int cmd_rc, rc;
 
@@ -222,6 +223,14 @@ long nvdimm_clear_poison(struct device *dev, phys_addr_t 
phys,
        if (clear_err.cleared > 0)
                nvdimm_forget_poison(nvdimm_bus, phys, clear_err.cleared);
 
+       if (clear_err.cleared > 0 && clear_err.cleared / 512) {
+               nvdimm_bus_lock(&nvdimm_bus->dev);
+               res.start = phys;
+               res.end = phys + clear_err.cleared - 1;
+               __nvdimm_bus_badblocks_clear(nvdimm_bus, &res);
+               nvdimm_bus_unlock(&nvdimm_bus->dev);
+       }
+
        return clear_err.cleared;
 }
 EXPORT_SYMBOL_GPL(nvdimm_clear_poison);