[PATCH 1/2] libnvdimm: fix clear length of nvdimm_forget_poison()

[Toshi Kani]

ND_CMD_CLEAR_ERROR command returns 'clear_err.cleared', the length
of error actually cleared, which may be smaller than its requested
'len'.

Change nvdimm_clear_poison() to call nvdimm_forget_poison() with
'clear_err.cleared' when this value is valid.

Signed-off-by: Toshi Kani <toshi.kani@xxxxxxx>
Cc: Dan Williams <dan.j.williams@xxxxxxxxx>
Cc: Dave Jiang <dave.jiang@xxxxxxxxx>
Cc: Vishal Verma <vishal.l.verma@xxxxxxxxx>
---
Based on 'libnvdimm-for-next'.
---
 drivers/nvdimm/bus.c |    4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/nvdimm/bus.c b/drivers/nvdimm/bus.c
index d214ac44..43ddfd4 100644
--- a/drivers/nvdimm/bus.c
+++ b/drivers/nvdimm/bus.c
@@ -219,7 +219,9 @@ long nvdimm_clear_poison(struct device *dev, phys_addr_t phys,
 	if (cmd_rc < 0)
 		return cmd_rc;
 
-	nvdimm_forget_poison(nvdimm_bus, phys, len);
+	if (clear_err.cleared > 0)
+		nvdimm_forget_poison(nvdimm_bus, phys, clear_err.cleared);
+
 	return clear_err.cleared;
 }
 EXPORT_SYMBOL_GPL(nvdimm_clear_poison);