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authorKaike Wan <kaike.wan@intel.com>2017-06-17 20:37:26 +0300
committerDoug Ledford <dledford@redhat.com>2017-07-20 18:20:50 +0300
commita25ce4270bfdd522207b02f81a594c7d1746b697 (patch)
tree1abc324af4c736e444135f1c6aa0f97201611048 /drivers/infiniband
parent266098b841d48f7f0db40424bdbc072e4db14e9b (diff)
downloadlinux-a25ce4270bfdd522207b02f81a594c7d1746b697.tar.xz
IB/rdmavt: Setting of QP timeout can overflow jiffies computation
Current computation of qp->timeout_jiffies in rvt_modify_qp() will cause overflow due to the fact that the input to the function usecs_to_jiffies is only 32-bit ( unsigned int). Overflow will occur when attr->timeout is equal to or greater than 30. The consequence is unnecessarily excessive retry and thus degradation of the system performance. This patch fixes the problem by limiting the input to 5-bit and calling usecs_to_jiffies() before multiplying the scaling factor. Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com> Signed-off-by: Kaike Wan <kaike.wan@intel.com> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers/infiniband')
-rw-r--r--drivers/infiniband/sw/rdmavt/qp.c4
1 files changed, 1 insertions, 3 deletions
diff --git a/drivers/infiniband/sw/rdmavt/qp.c b/drivers/infiniband/sw/rdmavt/qp.c
index 459865439a0b..8876ee7bc326 100644
--- a/drivers/infiniband/sw/rdmavt/qp.c
+++ b/drivers/infiniband/sw/rdmavt/qp.c
@@ -1258,9 +1258,7 @@ int rvt_modify_qp(struct ib_qp *ibqp, struct ib_qp_attr *attr,
if (attr_mask & IB_QP_TIMEOUT) {
qp->timeout = attr->timeout;
- qp->timeout_jiffies =
- usecs_to_jiffies((4096UL * (1UL << qp->timeout)) /
- 1000UL);
+ qp->timeout_jiffies = rvt_timeout_to_jiffies(qp->timeout);
}
if (attr_mask & IB_QP_QKEY)