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| author | Mike Marciniszyn <mike.marciniszyn@intel.com> | 2017-11-06 06:38:38 -0800 |
|---|---|---|
| committer | Doug Ledford <dledford@redhat.com> | 2017-11-13 15:53:57 -0500 |
| commit | d61ea0751aa097182291c7ceed447bc73e020109 (patch) | |
| tree | 8b78c4ea599d5268f4f83db9ff232a36f35b2c0c /drivers/infiniband/hw/hfi1/mad.c | |
| parent | 0e31a2e195220da576c32647277f849509588391 (diff) | |
| download | linux-stable-d61ea0751aa097182291c7ceed447bc73e020109.tar.gz linux-stable-d61ea0751aa097182291c7ceed447bc73e020109.tar.bz2 linux-stable-d61ea0751aa097182291c7ceed447bc73e020109.zip | |
IB/hfi1: Fix a wrapping test to insure the correct timeout
The "2 * UINT_MAX" statement:
if ((u64)(ts - cce->timestamp) > 2 * UINT_MAX) {
is equivalent to:
if ((u64)(ts - cce->timestamp) > UINT_MAX - 1) {
This results in a premature timeout of the cong log entry.
Fix by using unsigned 64 bit integers, removing casts, and using
an algebraic equivalent test to avoid the "2 * UINT_MAX" issue.
Also make use of kernel API to get nanoseconds instead of
open coding.
Reported-by: Dan Carpenter <dan.carpenter@oracle.com>
Reviewed-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/infiniband/hw/hfi1/mad.c')
| -rw-r--r-- | drivers/infiniband/hw/hfi1/mad.c | 6 |
1 files changed, 3 insertions, 3 deletions
diff --git a/drivers/infiniband/hw/hfi1/mad.c b/drivers/infiniband/hw/hfi1/mad.c index e648f589bade..0a867e5b65f7 100644 --- a/drivers/infiniband/hw/hfi1/mad.c +++ b/drivers/infiniband/hw/hfi1/mad.c @@ -3760,7 +3760,7 @@ static int __subn_get_opa_hfi1_cong_log(struct opa_smp *smp, u32 am, struct hfi1_ibport *ibp = to_iport(ibdev, port); struct hfi1_pportdata *ppd = ppd_from_ibp(ibp); struct opa_hfi1_cong_log *cong_log = (struct opa_hfi1_cong_log *)data; - s64 ts; + u64 ts; int i; if (am || smp_length_check(sizeof(*cong_log), max_len)) { @@ -3778,7 +3778,7 @@ static int __subn_get_opa_hfi1_cong_log(struct opa_smp *smp, u32 am, ppd->threshold_cong_event_map, sizeof(cong_log->threshold_cong_event_map)); /* keep timestamp in units of 1.024 usec */ - ts = ktime_to_ns(ktime_get()) / 1024; + ts = ktime_get_ns() / 1024; cong_log->current_time_stamp = cpu_to_be32(ts); for (i = 0; i < OPA_CONG_LOG_ELEMS; i++) { struct opa_hfi1_cong_log_event_internal *cce = @@ -3790,7 +3790,7 @@ static int __subn_get_opa_hfi1_cong_log(struct opa_smp *smp, u32 am, * required to wrap the counter are supposed to * be zeroed (CA10-49 IBTA, release 1.2.1, V1). */ - if ((u64)(ts - cce->timestamp) > (2 * UINT_MAX)) + if ((ts - cce->timestamp) / 2 > U32_MAX) continue; memcpy(cong_log->events[i].local_qp_cn_entry, &cce->lqpn, 3); memcpy(cong_log->events[i].remote_qp_number_cn_entry, |