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| author | Vaibhav Jain <vaibhav@linux.ibm.com> | 2020-06-15 18:14:05 +0530 |
|---|---|---|
| committer | Dan Williams <dan.j.williams@intel.com> | 2020-06-15 18:22:44 -0700 |
| commit | b5f38f09e1558c20265a2976b0337bab143a66c7 (patch) | |
| tree | baba9e83d556a3352605cbe375995eb30b875cd6 | |
| parent | b791abf3201d724ac372c2ba1fa6e90d192e1dbf (diff) | |
| download | linux-b5f38f09e1558c20265a2976b0337bab143a66c7.tar.gz linux-b5f38f09e1558c20265a2976b0337bab143a66c7.tar.bz2 linux-b5f38f09e1558c20265a2976b0337bab143a66c7.zip | |
powerpc/papr_scm: Improve error logging and handling papr_scm_ndctl()
Since papr_scm_ndctl() can be called from outside papr_scm, its
exposed to the possibility of receiving NULL as value of 'cmd_rc'
argument. This patch updates papr_scm_ndctl() to protect against such
possibility by assigning it pointer to a local variable in case cmd_rc
== NULL.
Finally the patch also updates the 'default' add a debug log unknown
'cmd' values.
Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Cc: "Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Ira Weiny <ira.weiny@intel.com>
Link: https://lore.kernel.org/r/20200615124407.32596-5-vaibhav@linux.ibm.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
| -rw-r--r-- | arch/powerpc/platforms/pseries/papr_scm.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/arch/powerpc/platforms/pseries/papr_scm.c b/arch/powerpc/platforms/pseries/papr_scm.c index 0c091622b15e..692ad3d79826 100644 --- a/arch/powerpc/platforms/pseries/papr_scm.c +++ b/arch/powerpc/platforms/pseries/papr_scm.c @@ -355,11 +355,16 @@ static int papr_scm_ndctl(struct nvdimm_bus_descriptor *nd_desc, { struct nd_cmd_get_config_size *get_size_hdr; struct papr_scm_priv *p; + int rc; /* Only dimm-specific calls are supported atm */ if (!nvdimm) return -EINVAL; + /* Use a local variable in case cmd_rc pointer is NULL */ + if (!cmd_rc) + cmd_rc = &rc; + p = nvdimm_provider_data(nvdimm); switch (cmd) { @@ -381,6 +386,7 @@ static int papr_scm_ndctl(struct nvdimm_bus_descriptor *nd_desc, break; default: + dev_dbg(&p->pdev->dev, "Unknown command = %d\n", cmd); return -EINVAL; } |