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powerpc/papr_scm: Fix warning triggered by perf_stats_show()

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A warning is reported by the kernel in case perf_stats_show() returns
an error code. The warning is of the form below:

 papr_scm ibm,persistent-memory:ibm,pmemory@44100001:
 	  Failed to query performance stats, Err:-10
 dev_attr_show: perf_stats_show+0x0/0x1c0 [papr_scm] returned bad count
 fill_read_buffer: dev_attr_show+0x0/0xb0 returned bad count

On investigation it looks like that the compiler is silently
truncating the return value of drc_pmem_query_stats() from 'long' to
'int', since the variable used to store the return code 'rc' is an
'int'. This truncated value is then returned back as a 'ssize_t' back
from perf_stats_show() to 'dev_attr_show()' which thinks of it as a
large unsigned number and triggers this warning..

To fix this we update the type of variable 'rc' from 'int' to
'ssize_t' that prevents the compiler from truncating the return value
of drc_pmem_query_stats() and returning correct signed value back from
perf_stats_show().

Fixes: 2d02bf835e ("powerpc/papr_scm: Fetch nvdimm performance stats from PHYP")
Signed-off-by: Vaibhav Jain <vaibhav@linux.ibm.com>
Reviewed-by: Ira Weiny <ira.weiny@intel.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200912081451.66225-1-vaibhav@linux.ibm.com
This commit is contained in:
Vaibhav Jain 2020-09-12 13:44:51 +05:30 committed by Michael Ellerman
parent 8f7e57e8e2
commit ca78ef2f08
1 changed files with 3 additions and 2 deletions
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5
arch/powerpc/platforms/pseries/papr_scm.c
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@ -785,7 +785,8 @@ static int papr_scm_ndctl(struct nvdimm_bus_descriptor *nd_desc,
static ssize_t perf_stats_show(struct device *dev,
struct device_attribute *attr, char *buf)
{
int index, rc;
int index;
ssize_t rc;
struct seq_buf s;
struct papr_scm_perf_stat *stat;
struct papr_scm_perf_stats *stats;
@ -820,7 +821,7 @@ static ssize_t perf_stats_show(struct device *dev,
free_stats:
kfree(stats);
return rc ? rc : seq_buf_used(&s);
return rc ? rc : (ssize_t)seq_buf_used(&s);
}
DEVICE_ATTR_ADMIN_RO(perf_stats);