* [PATCH] libnvdimm/region: Fix label activation vs errors
@ 2021-07-30 16:46 Dan Williams
2021-08-04 17:12 ` Jeff Moyer
0 siblings, 1 reply; 2+ messages in thread
From: Dan Williams @ 2021-07-30 16:46 UTC (permalink / raw)
To: nvdimm; +Cc: Krzysztof Kensicki, vishal.l.verma
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>
Fixes: bf9bccc14c05 ("libnvdimm: pmem label sets and namespace instantiation.")
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
---
drivers/nvdimm/namespace_devs.c | 17 +++++++++++------
1 file changed, 11 insertions(+), 6 deletions(-)
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)
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH] libnvdimm/region: Fix label activation vs errors
2021-07-30 16:46 [PATCH] libnvdimm/region: Fix label activation vs errors Dan Williams
@ 2021-08-04 17:12 ` Jeff Moyer
0 siblings, 0 replies; 2+ messages in thread
From: Jeff Moyer @ 2021-08-04 17:12 UTC (permalink / raw)
To: Dan Williams; +Cc: nvdimm, Krzysztof Kensicki, vishal.l.verma
Dan Williams <dan.j.williams@intel.com> writes:
> 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>
> Fixes: bf9bccc14c05 ("libnvdimm: pmem label sets and namespace instantiation.")
> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Reviewed-by: Jeff Moyer <jmoyer@redhat.com>
> ---
> drivers/nvdimm/namespace_devs.c | 17 +++++++++++------
> 1 file changed, 11 insertions(+), 6 deletions(-)
>
> 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)
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-07-30 16:46 [PATCH] libnvdimm/region: Fix label activation vs errors Dan Williams
2021-08-04 17:12 ` Jeff Moyer
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