--- a/arch/mips/bcm47xx/setup.c
+++ b/arch/mips/bcm47xx/setup.c
@@ -90,6 +90,7 @@ static int bcm47xx_get_sprom_ssb(struct
 	char prefix[10];
 
 	if (bus->bustype == SSB_BUSTYPE_PCI) {
+		memset(out, 0, sizeof(struct ssb_sprom));
 		snprintf(prefix, sizeof(prefix), "pci/%u/%u/",
 			 bus->host_pci->bus->number + 1,
 			 PCI_SLOT(bus->host_pci->devfn));
@@ -111,6 +112,7 @@ static int bcm47xx_get_invariants(struct
 
 	bcm47xx_fill_ssb_boardinfo(&iv->boardinfo, NULL);
 
+	memset(&iv->sprom, 0, sizeof(struct ssb_sprom));
 	bcm47xx_fill_sprom(&iv->sprom, NULL);
 
 	if (nvram_getenv("cardbus", buf, sizeof(buf)) >= 0)
@@ -159,12 +161,14 @@ static int bcm47xx_get_sprom_bcma(struct
 
 	switch (bus->hosttype) {
 	case BCMA_HOSTTYPE_PCI:
+		memset(out, 0, sizeof(struct ssb_sprom));
 		snprintf(prefix, sizeof(prefix), "pci/%u/%u/",
 			 bus->host_pci->bus->number + 1,
 			 PCI_SLOT(bus->host_pci->devfn));
 		bcm47xx_fill_sprom(out, prefix);
 		return 0;
 	case BCMA_HOSTTYPE_SOC:
+		memset(out, 0, sizeof(struct ssb_sprom));
 		bcm47xx_fill_sprom_ethernet(out, NULL);
 		core = bcma_find_core(bus, BCMA_CORE_80211);
 		if (core) {
--- a/arch/mips/bcm47xx/sprom.c
+++ b/arch/mips/bcm47xx/sprom.c
@@ -557,8 +557,6 @@ void bcm47xx_fill_sprom_ethernet(struct
 
 void bcm47xx_fill_sprom(struct ssb_sprom *sprom, const char *prefix)
 {
-	memset(sprom, 0, sizeof(struct ssb_sprom));
-
 	bcm47xx_fill_sprom_ethernet(sprom, prefix);
 
 	nvram_read_u8(prefix, NULL, "sromrev", &sprom->revision, 0);