diff options
Diffstat (limited to 'host/lib/crossystem.c')
| -rw-r--r-- | host/lib/crossystem.c | 17 |
1 files changed, 11 insertions, 6 deletions
diff --git a/host/lib/crossystem.c b/host/lib/crossystem.c index b28fd877..43dcc2a4 100644 --- a/host/lib/crossystem.c +++ b/host/lib/crossystem.c @@ -80,20 +80,24 @@ int FwidStartsWith(const char *start) { return 0 == strncmp(fwid, start, strlen(start)); } +static int vnc_read; int VbGetNvStorage(VbNvParam param) { - VbNvContext vnc; uint32_t value; int retval; + static VbNvContext cached_vnc; /* TODO: locking around NV access */ + if (!vnc_read) { + if (0 != VbReadNvStorage(&cached_vnc)) + return -1; + vnc_read = 1; + } - if (0 != VbReadNvStorage(&vnc)) + if (0 != VbNvSetup(&cached_vnc)) return -1; - if (0 != VbNvSetup(&vnc)) - return -1; - retval = VbNvGet(&vnc, param, &value); - if (0 != VbNvTeardown(&vnc)) + retval = VbNvGet(&cached_vnc, param, &value); + if (0 != VbNvTeardown(&cached_vnc)) return -1; if (0 != retval) return -1; @@ -123,6 +127,7 @@ int VbSetNvStorage(VbNvParam param, int value) { goto VbSetNvCleanup; if (vnc.raw_changed) { + vnc_read = 0; if (0 != VbWriteNvStorage(&vnc)) goto VbSetNvCleanup; } |