+fail2:
+ EFSYS_PROBE(fail2);
+fail1:
+ EFSYS_PROBE1(fail1, efx_rc_t, rc);
+
+ return (rc);
+}
+
+/*
+ * Read from the backup (writeable) store of an A/B partition.
+ * For non A/B partitions, there is only a single store, and so this
+ * function has the same behaviour as efx_nvram_read_chunk().
+ */
+ __checkReturn efx_rc_t
+efx_nvram_read_backup(
+ __in efx_nic_t *enp,
+ __in efx_nvram_type_t type,
+ __in unsigned int offset,
+ __out_bcount(size) caddr_t data,
+ __in size_t size)
+{
+ const efx_nvram_ops_t *envop = enp->en_envop;
+ uint32_t partn;
+ efx_rc_t rc;
+
+ EFSYS_ASSERT3U(enp->en_magic, ==, EFX_NIC_MAGIC);
+ EFSYS_ASSERT3U(enp->en_mod_flags, &, EFX_MOD_NVRAM);
+
+ EFSYS_ASSERT3U(type, <, EFX_NVRAM_NTYPES);
+ EFSYS_ASSERT3U(type, !=, EFX_NVRAM_INVALID);
+
+ 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_backup(enp, partn, offset,
+ data, size)) != 0)
+ goto fail2;
+
+ return (0);
+