diff --git a/drivers/net/sfc/base/efx_impl.h b/drivers/net/sfc/base/efx_impl.h
index 6cb015a..7b07f34 100644
--- a/drivers/net/sfc/base/efx_impl.h
+++ b/drivers/net/sfc/base/efx_impl.h
@@ -461,6 +461,10 @@ typedef struct efx_mcdi_s {
 #endif /* EFSYS_OPT_MCDI */
 
 #if EFSYS_OPT_NVRAM
+
+/* Invalid partition ID for en_nvram_partn_locked field of efx_nc_t */
+#define	EFX_NVRAM_PARTN_INVALID		(0xffffffffu)
+
 typedef struct efx_nvram_ops_s {
 #if EFSYS_OPT_DIAG
 	efx_rc_t	(*envo_test)(efx_nic_t *);
@@ -648,7 +652,7 @@ struct efx_nic_s {
 	efx_mcdi_t		en_mcdi;
 #endif	/* EFSYS_OPT_MCDI */
 #if EFSYS_OPT_NVRAM
-	efx_nvram_type_t	en_nvram_locked;
+	uint32_t		en_nvram_partn_locked;
 	const efx_nvram_ops_t	*en_envop;
 #endif	/* EFSYS_OPT_NVRAM */
 #if EFSYS_OPT_VPD
diff --git a/drivers/net/sfc/base/efx_nvram.c b/drivers/net/sfc/base/efx_nvram.c
index 6e22169..a2b0e05 100644
--- a/drivers/net/sfc/base/efx_nvram.c
+++ b/drivers/net/sfc/base/efx_nvram.c
@@ -112,6 +112,8 @@ efx_nvram_init(
 	enp->en_envop = envop;
 	enp->en_mod_flags |= EFX_MOD_NVRAM;
 
+	enp->en_nvram_partn_locked = EFX_NVRAM_PARTN_INVALID;
+
 	return (0);
 
 fail1:
@@ -227,15 +229,15 @@ efx_nvram_rw_start(
 	EFSYS_ASSERT3U(type, <, EFX_NVRAM_NTYPES);
 	EFSYS_ASSERT3U(type, !=, EFX_NVRAM_INVALID);
 
-	EFSYS_ASSERT3U(enp->en_nvram_locked, ==, EFX_NVRAM_INVALID);
-
 	if ((rc = envop->envo_type_to_partn(enp, type, &partn)) != 0)
 		goto fail1;
 
+	EFSYS_ASSERT3U(enp->en_nvram_partn_locked, ==, EFX_NVRAM_PARTN_INVALID);
+
 	if ((rc = envop->envo_partn_rw_start(enp, partn, chunk_sizep)) != 0)
 		goto fail2;
 
-	enp->en_nvram_locked = type;
+	enp->en_nvram_partn_locked = partn;
 
 	return (0);
 
@@ -265,11 +267,11 @@ efx_nvram_read_chunk(
 	EFSYS_ASSERT3U(type, <, EFX_NVRAM_NTYPES);
 	EFSYS_ASSERT3U(type, !=, EFX_NVRAM_INVALID);
 
-	EFSYS_ASSERT3U(enp->en_nvram_locked, ==, type);
-
 	if ((rc = envop->envo_type_to_partn(enp, type, &partn)) != 0)
 		goto fail1;
 
+	EFSYS_ASSERT3U(enp->en_nvram_partn_locked, ==, partn);
+
 	if ((rc = envop->envo_partn_read(enp, partn, offset, data, size)) != 0)
 		goto fail2;
 
@@ -300,11 +302,11 @@ efx_nvram_erase(
 	EFSYS_ASSERT3U(type, <, EFX_NVRAM_NTYPES);
 	EFSYS_ASSERT3U(type, !=, EFX_NVRAM_INVALID);
 
-	EFSYS_ASSERT3U(enp->en_nvram_locked, ==, type);
-
 	if ((rc = envop->envo_type_to_partn(enp, type, &partn)) != 0)
 		goto fail1;
 
+	EFSYS_ASSERT3U(enp->en_nvram_partn_locked, ==, partn);
+
 	if ((rc = envop->envo_partn_size(enp, partn, &size)) != 0)
 		goto fail2;
 
@@ -341,11 +343,11 @@ efx_nvram_write_chunk(
 	EFSYS_ASSERT3U(type, <, EFX_NVRAM_NTYPES);
 	EFSYS_ASSERT3U(type, !=, EFX_NVRAM_INVALID);
 
-	EFSYS_ASSERT3U(enp->en_nvram_locked, ==, type);
-
 	if ((rc = envop->envo_type_to_partn(enp, type, &partn)) != 0)
 		goto fail1;
 
+	EFSYS_ASSERT3U(enp->en_nvram_partn_locked, ==, partn);
+
 	if ((rc = envop->envo_partn_write(enp, partn, offset, data, size)) != 0)
 		goto fail2;
 
@@ -376,15 +378,15 @@ efx_nvram_rw_finish(
 	EFSYS_ASSERT3U(type, <, EFX_NVRAM_NTYPES);
 	EFSYS_ASSERT3U(type, !=, EFX_NVRAM_INVALID);
 
-	EFSYS_ASSERT3U(enp->en_nvram_locked, ==, type);
-
 	if ((rc = envop->envo_type_to_partn(enp, type, &partn)) != 0)
 		goto fail1;
 
+	EFSYS_ASSERT3U(enp->en_nvram_partn_locked, ==, partn);
+
 	if ((rc = envop->envo_partn_rw_finish(enp, partn, &verify_result)) != 0)
 		goto fail2;
 
-	enp->en_nvram_locked = EFX_NVRAM_INVALID;
+	enp->en_nvram_partn_locked = EFX_NVRAM_PARTN_INVALID;
 
 	if (verify_resultp != NULL)
 		*verify_resultp = verify_result;
@@ -393,7 +395,7 @@ efx_nvram_rw_finish(
 
 fail2:
 	EFSYS_PROBE(fail2);
-	enp->en_nvram_locked = EFX_NVRAM_INVALID;
+	enp->en_nvram_partn_locked = EFX_NVRAM_PARTN_INVALID;
 
 fail1:
 	EFSYS_PROBE1(fail1, efx_rc_t, rc);
@@ -421,15 +423,15 @@ efx_nvram_set_version(
 
 	EFSYS_ASSERT3U(type, <, EFX_NVRAM_NTYPES);
 
+	if ((rc = envop->envo_type_to_partn(enp, type, &partn)) != 0)
+		goto fail1;
+
 	/*
 	 * The Siena implementation of envo_set_version() will attempt to
-	 * acquire the NVRAM_UPDATE lock for the DYNAMIC_CONFIG sector.
+	 * acquire the NVRAM_UPDATE lock for the DYNAMIC_CONFIG partition.
 	 * Therefore, you can't have already acquired the NVRAM_UPDATE lock.
 	 */
-	EFSYS_ASSERT3U(enp->en_nvram_locked, ==, EFX_NVRAM_INVALID);
-
-	if ((rc = envop->envo_type_to_partn(enp, type, &partn)) != 0)
-		goto fail1;
+	EFSYS_ASSERT3U(enp->en_nvram_partn_locked, ==, EFX_NVRAM_PARTN_INVALID);
 
 	if ((rc = envop->envo_partn_set_version(enp, partn, version)) != 0)
 		goto fail2;
@@ -490,7 +492,7 @@ efx_nvram_fini(
 	EFSYS_ASSERT3U(enp->en_mod_flags, &, EFX_MOD_PROBE);
 	EFSYS_ASSERT3U(enp->en_mod_flags, &, EFX_MOD_NVRAM);
 
-	EFSYS_ASSERT3U(enp->en_nvram_locked, ==, EFX_NVRAM_INVALID);
+	EFSYS_ASSERT3U(enp->en_nvram_partn_locked, ==, EFX_NVRAM_PARTN_INVALID);
 
 	enp->en_envop = NULL;
 	enp->en_mod_flags &= ~EFX_MOD_NVRAM;
