[PATCH] osmo-bsc[master]: Fix: meas_rep.c will only use valid DL measurement reports

[Neels Hofmeyr]

Review at  https://gerrit.osmocom.org/5923

Fix: meas_rep.c will only use valid DL measurement reports

When averaging measurements, only the valid reports are used. If there is
no valid report in the averaging window at all, an error is returned.

Change-Id: I33056225ead788340755e98113d72e1cbf3ebce6
---
M src/libbsc/meas_rep.c
1 file changed, 19 insertions(+), 4 deletions(-)


  git pull ssh://gerrit.osmocom.org:29418/osmo-bsc refs/changes/23/5923/1

diff --git a/src/libbsc/meas_rep.c b/src/libbsc/meas_rep.c
index fbd1515..73d9a1f 100644
--- a/src/libbsc/meas_rep.c
+++ b/src/libbsc/meas_rep.c
@@ -29,12 +29,20 @@
 {
        switch (field) {
        case MEAS_REP_DL_RXLEV_FULL:
+               if (!(rep->flags & MEAS_REP_F_DL_VALID))
+                       return -EINVAL;
                return rep->dl.full.rx_lev;
        case MEAS_REP_DL_RXLEV_SUB:
+               if (!(rep->flags & MEAS_REP_F_DL_VALID))
+                       return -EINVAL;
                return rep->dl.sub.rx_lev;
        case MEAS_REP_DL_RXQUAL_FULL:
+               if (!(rep->flags & MEAS_REP_F_DL_VALID))
+                       return -EINVAL;
                return rep->dl.full.rx_qual;
        case MEAS_REP_DL_RXQUAL_SUB:
+               if (!(rep->flags & MEAS_REP_F_DL_VALID))
+                       return -EINVAL;
                return rep->dl.sub.rx_qual;
        case MEAS_REP_UL_RXLEV_FULL:
                return rep->ul.full.rx_lev;
@@ -73,7 +81,7 @@
                     enum meas_rep_field field, unsigned int num)
 {
        unsigned int i, idx;
-       int avg = 0;
+       int avg = 0, valid_num = 0;
 
        if (num < 1)
                return -EINVAL;
@@ -86,11 +94,18 @@
 
        for (i = 0; i < num; i++) {
                int j = (idx+i) % ARRAY_SIZE(lchan->meas_rep);
+               int val = get_field(&lchan->meas_rep[j], field);
 
-               avg += get_field(&lchan->meas_rep[j], field);
+               if (val >= 0) {
+                       avg += val;
+                       valid_num++;
+               }
        }
 
-       return avg / num;
+       if (valid_num == 0)
+               return -EINVAL;
+
+       return avg / valid_num;
 }
 
 /* Check if N out of M last values for FIELD are >= bd */
@@ -108,7 +123,7 @@
                int j = (idx + i) % ARRAY_SIZE(lchan->meas_rep);
                int val = get_field(&lchan->meas_rep[j], field);
 
-               if (val >= be)
+               if (val >= be) /* implies that val < 0 will not count */
                        count++;
 
                if (count >= n)

-- 
To view, visit https://gerrit.osmocom.org/5923
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Gerrit-MessageType: newchange
Gerrit-Change-Id: I33056225ead788340755e98113d72e1cbf3ebce6
Gerrit-PatchSet: 1
Gerrit-Project: osmo-bsc
Gerrit-Branch: master
Gerrit-Owner: Neels Hofmeyr <nhofm...@sysmocom.de>
Gerrit-Reviewer: Jenkins Builder