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powerpc/vphn: Check for error from hcall_vphn 

There is no value in unpacking associativity, if
H_HOME_NODE_ASSOCIATIVITY hcall has returned an error.

Signed-off-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Reported-by: Abdul Haleem <abdhalee@linux.vnet.ibm.com>
Reviewed-by: Nathan Lynch <nathanl@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20200129135301.24739-2-srikar@linux.vnet.ibm.com
This commit is contained in:
Srikar Dronamraju 2020-01-29 19:22:57 +05:30 committed by Michael Ellerman
parent a05f0e5be4
commit e7214ae9d8
1 changed files with 2 additions and 1 deletions
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3
arch/powerpc/platforms/pseries/vphn.c
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@ -82,7 +82,8 @@ long hcall_vphn(unsigned long cpu, u64 flags, __be32 *associativity)
long retbuf[PLPAR_HCALL9_BUFSIZE] = {0};
rc = plpar_hcall9(H_HOME_NODE_ASSOCIATIVITY, retbuf, flags, cpu);
vphn_unpack_associativity(retbuf, associativity);
if (rc == H_SUCCESS)
vphn_unpack_associativity(retbuf, associativity);
return rc;
}