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DM: compare unsigned numbers to avoid overflow. 

compare the two unsigned numbers to avoid delta calculation overflow.
It could happen during UOS warm root, which can trigger a "fake"
interrupt storm.

Tracked-On: #1476
Signed-off-by: Minggui Cao <minggui.cao@intel.com>
Acked-by: Anthony Xu <anthony.xu@intel.com>
This commit is contained in:
Minggui Cao 2018-10-18 14:45:34 +08:00 committed by wenlingz
parent d29937374a
commit 4228c81b3f
1 changed files with 4 additions and 0 deletions
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4
devicemodel/core/monitor.c
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@ -121,6 +121,10 @@ static void *intr_storm_monitor_thread(void *arg)
if (hdr->buffer[i] != intr_cnt_buf[i]) if (hdr->buffer[i] != intr_cnt_buf[i])
continue; continue;
/* avoid delta overflow */
if (hdr->buffer[i + 1] < intr_cnt_buf[i + 1])
continue;
delta = hdr->buffer[i + 1] - intr_cnt_buf[i + 1]; delta = hdr->buffer[i + 1] - intr_cnt_buf[i + 1];
if (delta > INTR_STORM_THRESHOLD) { if (delta > INTR_STORM_THRESHOLD) {
#ifdef INTR_MONITOR_DBG #ifdef INTR_MONITOR_DBG