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spapr: Make ibm, change-msi respect 3 return values 

Currently, rtas_ibm_change_msi() always returns four values even if
less are specified.

Correct this by only returning the fourth parameter if it was
requested.

This is specified by PAPR.

Signed-off-by: Sam Bobroff <sam.bobroff@au1.ibm.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Sam Bobroff 2015-09-01 11:23:47 +10:00 committed by David Gibson
parent a95f99224c
commit b359bd6a42
1 changed files with 3 additions and 1 deletions
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4
hw/ppc/spapr_pci.c
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@ -375,7 +375,9 @@ out:
rtas_st(rets, 0, RTAS_OUT_SUCCESS);
rtas_st(rets, 1, req_num);
rtas_st(rets, 2, ++seq_num);
rtas_st(rets, 3, ret_intr_type);
if (nret > 3) {
rtas_st(rets, 3, ret_intr_type);
}
trace_spapr_pci_rtas_ibm_change_msi(config_addr, func, req_num, irq);
}