diff options
| author | Vaibhav Jain <vaibhav@linux.ibm.com> | 2021-04-02 14:55:55 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2021-04-21 12:56:16 +0200 |
| commit | 61ca5b653220bb644e1623c424487318bbdfbac9 (patch) | |
| tree | d52dcfcbb06f23a930b57cf979e7ba15c3c20ad2 /drivers/nvdimm | |
| parent | 4ce8e86d125dd6944abcd2f3d92200ad1340df38 (diff) | |
libnvdimm/region: Fix nvdimm_has_flush() to handle ND_REGION_ASYNC
commit a2948b17f6b936fc52f86c0f92c46d2f91928b79 upstream.
In case a platform doesn't provide explicit flush-hints but provides an
explicit flush callback via ND_REGION_ASYNC region flag, then
nvdimm_has_flush() still returns '0' indicating that writes do not
require flushing. This happens on PPC64 with patch at [1] applied, where
'deep_flush' of a region was denied even though an explicit flush
function was provided.
Fix this by adding a condition to nvdimm_has_flush() to test for the
ND_REGION_ASYNC flag on the region and see if a 'region->flush' callback
is assigned.
Link: http://lore.kernel.org/r/161703936121.36.7260632399582101498.stgit@e1fbed493c87 [1]
Fixes: c5d4355d10d4 ("libnvdimm: nd_region flush callback support")
Reported-by: Shivaprasad G Bhat <sbhat@linux.ibm.com>
Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Link: https://lore.kernel.org/r/20210402092555.208590-1-vaibhav@linux.ibm.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/nvdimm')
| -rw-r--r-- | drivers/nvdimm/region_devs.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/nvdimm/region_devs.c b/drivers/nvdimm/region_devs.c index ef423ba1a711..b8236a9e8750 100644 --- a/drivers/nvdimm/region_devs.c +++ b/drivers/nvdimm/region_devs.c @@ -1142,6 +1142,11 @@ int nvdimm_has_flush(struct nd_region *nd_region) || !IS_ENABLED(CONFIG_ARCH_HAS_PMEM_API)) return -ENXIO; + /* Test if an explicit flush function is defined */ + if (test_bit(ND_REGION_ASYNC, &nd_region->flags) && nd_region->flush) + return 1; + + /* Test if any flush hints for the region are available */ for (i = 0; i < nd_region->ndr_mappings; i++) { struct nd_mapping *nd_mapping = &nd_region->mapping[i]; struct nvdimm *nvdimm = nd_mapping->nvdimm; @@ -1152,8 +1157,8 @@ int nvdimm_has_flush(struct nd_region *nd_region) } /* - * The platform defines dimm devices without hints, assume - * platform persistence mechanism like ADR + * The platform defines dimm devices without hints nor explicit flush, + * assume platform persistence mechanism like ADR */ return 0; } |