--- /dev/null
+From 8d13c0290655b883df9083a2a0af0d782bc38aef Mon Sep 17 00:00:00 2001
+From: Toshi Kani <toshi.kani@hpe.com>
+Date: Thu, 27 Apr 2017 16:57:05 -0600
+Subject: libnvdimm: fix clear length of nvdimm_forget_poison()
+
+From: Toshi Kani <toshi.kani@hpe.com>
+
+commit 8d13c0290655b883df9083a2a0af0d782bc38aef upstream.
+
+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.
+
+Fixes: e046114af5fc ("libnvdimm: clear the internal poison_list when clearing badblocks")
+Cc: Dave Jiang <dave.jiang@intel.com>
+Cc: Vishal Verma <vishal.l.verma@intel.com>
+Signed-off-by: Toshi Kani <toshi.kani@hpe.com>
+Signed-off-by: Dan Williams <dan.j.williams@intel.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ drivers/nvdimm/bus.c | 5 ++++-
+ 1 file changed, 4 insertions(+), 1 deletion(-)
+
+--- a/drivers/nvdimm/bus.c
++++ b/drivers/nvdimm/bus.c
+@@ -218,7 +218,10 @@ long nvdimm_clear_poison(struct device *
+ if (cmd_rc < 0)
+ return cmd_rc;
+
+- nvdimm_clear_from_poison_list(nvdimm_bus, phys, len);
++ if (clear_err.cleared > 0)
++ nvdimm_clear_from_poison_list(nvdimm_bus, phys,
++ clear_err.cleared);
++
+ return clear_err.cleared;
+ }
+ EXPORT_SYMBOL_GPL(nvdimm_clear_poison);