The patch below does not apply to the 4.19-stable tree. If someone wants it applied there, or to any other stable or longterm tree, then please email the backport, including the original git commit id to stable@vger.kernel.org.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
From d9cee9f85b22fab88d2b76d2e92b18e3d0e6aa8c Mon Sep 17 00:00:00 2001
From: Dan Williams dan.j.williams@intel.com Date: Fri, 30 Jul 2021 09:46:04 -0700 Subject: [PATCH] libnvdimm/region: Fix label activation vs errors
There are a few scenarios where init_active_labels() can return without registering deactivate_labels() to run when the region is disabled. In particular label error injection creates scenarios where a DIMM is disabled, but labels on other DIMMs in the region become activated.
Arrange for init_active_labels() to always register deactivate_labels().
Reported-by: Krzysztof Kensicki krzysztof.kensicki@intel.com Cc: stable@vger.kernel.org Fixes: bf9bccc14c05 ("libnvdimm: pmem label sets and namespace instantiation.") Reviewed-by: Jeff Moyer jmoyer@redhat.com Link: https://lore.kernel.org/r/162766356450.3223041.1183118139023841447.stgit@dwi... Signed-off-by: Dan Williams dan.j.williams@intel.com
diff --git a/drivers/nvdimm/namespace_devs.c b/drivers/nvdimm/namespace_devs.c index 2403b71b601e..745478213ff2 100644 --- a/drivers/nvdimm/namespace_devs.c +++ b/drivers/nvdimm/namespace_devs.c @@ -2527,7 +2527,7 @@ static void deactivate_labels(void *region)
static int init_active_labels(struct nd_region *nd_region) { - int i; + int i, rc = 0;
for (i = 0; i < nd_region->ndr_mappings; i++) { struct nd_mapping *nd_mapping = &nd_region->mapping[i]; @@ -2546,13 +2546,14 @@ static int init_active_labels(struct nd_region *nd_region) else if (test_bit(NDD_LABELING, &nvdimm->flags)) /* fail, labels needed to disambiguate dpa */; else - return 0; + continue;
dev_err(&nd_region->dev, "%s: is %s, failing probe\n", dev_name(&nd_mapping->nvdimm->dev), test_bit(NDD_LOCKED, &nvdimm->flags) ? "locked" : "disabled"); - return -ENXIO; + rc = -ENXIO; + goto out; } nd_mapping->ndd = ndd; atomic_inc(&nvdimm->busy); @@ -2586,13 +2587,17 @@ static int init_active_labels(struct nd_region *nd_region) break; }
- if (i < nd_region->ndr_mappings) { + if (i < nd_region->ndr_mappings) + rc = -ENOMEM; + +out: + if (rc) { deactivate_labels(nd_region); - return -ENOMEM; + return rc; }
return devm_add_action_or_reset(&nd_region->dev, deactivate_labels, - nd_region); + nd_region); }
int nd_region_register_namespaces(struct nd_region *nd_region, int *err)