diff options
| author | Jianxin Xiong <jianxin.xiong@intel.com> | 2016-05-19 05:21:57 -0700 |
|---|---|---|
| committer | Doug Ledford <dledford@redhat.com> | 2016-05-26 11:23:11 -0400 |
| commit | b583faf4dc6eaa64895c37b81983e75a8c3c1e4e (patch) | |
| tree | 3b94997fa2b5f7c5c91e8351b9d917b9d28e02ed /drivers | |
| parent | f70f5f6af36bce29fe2c4bc733a223b5746eb65f (diff) | |
| download | linux-b583faf4dc6eaa64895c37b81983e75a8c3c1e4e.tar.gz | |
IB/hfi1: Fix bug that blocks process on exit after port bounce
During the processing of a user SDMA request, if there was an error before the request counter was increased, the state of the packet queue could be updated incorrectly, causing the counter to underflow. As the result, the process could get stuck later since the counter could never get back to 0. This patch adds a condition to guard the packet queue update so that the counter is only decreased if it has been increased before the error happens. Reviewed-by: Mitko Haralanov <mitko.haralanov@intel.com> Signed-off-by: Jianxin Xiong <jianxin.xiong@intel.com> Signed-off-by: Doug Ledford <dledford@redhat.com>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/staging/rdma/hfi1/user_sdma.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/drivers/staging/rdma/hfi1/user_sdma.c b/drivers/staging/rdma/hfi1/user_sdma.c index aed2878c97f1..29f4795f866c 100644 --- a/drivers/staging/rdma/hfi1/user_sdma.c +++ b/drivers/staging/rdma/hfi1/user_sdma.c @@ -510,6 +510,7 @@ int hfi1_user_sdma_process_request(struct file *fp, struct iovec *iovec, struct sdma_req_info info; struct user_sdma_request *req; u8 opcode, sc, vl; + int req_queued = 0; if (iovec[idx].iov_len < sizeof(info) + sizeof(req->hdr)) { hfi1_cdbg( @@ -706,6 +707,7 @@ int hfi1_user_sdma_process_request(struct file *fp, struct iovec *iovec, set_comp_state(pq, cq, info.comp_idx, QUEUED, 0); atomic_inc(&pq->n_reqs); + req_queued = 1; /* Send the first N packets in the request to buy us some time */ ret = user_sdma_send_pkts(req, pcount); if (unlikely(ret < 0 && ret != -EBUSY)) { @@ -750,7 +752,8 @@ int hfi1_user_sdma_process_request(struct file *fp, struct iovec *iovec, return 0; free_req: user_sdma_free_request(req, true); - pq_update(pq); + if (req_queued) + pq_update(pq); set_comp_state(pq, cq, info.comp_idx, ERROR, req->status); return ret; } |