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| author | Sebastian Sanchez | 2017-08-13 17:08:22 +0200 |
|---|---|---|
| committer | Doug Ledford | 2017-08-22 20:22:37 +0200 |
| commit | b6422bc01259aea7e4e11f1cd052e80acdf1275b (patch) | |
| tree | eafcbe44eaa817b571e805429bcca9e5a9978280 /drivers/infiniband/hw/hfi1/chip.c | |
| parent | IB/hfi1: fix spelling mistake: "Maximim" -> "Maximum" (diff) | |
| download | kernel-qcow2-linux-b6422bc01259aea7e4e11f1cd052e80acdf1275b.tar.gz kernel-qcow2-linux-b6422bc01259aea7e4e11f1cd052e80acdf1275b.tar.xz kernel-qcow2-linux-b6422bc01259aea7e4e11f1cd052e80acdf1275b.zip | |
IB/hfi1: Check xchg returned value for queuing link down entry
Check xchg returned value for queuing link down entry
to guarantee proper atomic value reads.
Fixes: 626c077c025f ("IB/hfi1: Prevent link down request double queuing")
Reviewed-by: Mike Marciniszyn <mike.marciniszyn@intel.com>
Signed-off-by: Sebastian Sanchez <sebastian.sanchez@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/chip.c')
| -rw-r--r-- | drivers/infiniband/hw/hfi1/chip.c | 18 |
1 files changed, 12 insertions, 6 deletions
diff --git a/drivers/infiniband/hw/hfi1/chip.c b/drivers/infiniband/hw/hfi1/chip.c index cbda37386982..bfb50a4e7e5f 100644 --- a/drivers/infiniband/hw/hfi1/chip.c +++ b/drivers/infiniband/hw/hfi1/chip.c @@ -7810,16 +7810,22 @@ static void handle_8051_interrupt(struct hfi1_devdata *dd, u32 unused, u64 reg) if (queue_link_down) { /* * if the link is already going down or disabled, do not - * queue another + * queue another. If there's a link down entry already + * queued, don't queue another one. */ if ((ppd->host_link_state & (HLS_GOING_OFFLINE | HLS_LINK_COOLDOWN)) || - ppd->link_enabled == 0 || ppd->is_link_down_queued) { - dd_dev_info(dd, "%s: not queuing link down\n", - __func__); + ppd->link_enabled == 0) { + dd_dev_info(dd, "%s: not queuing link down. host_link_state %x, link_enabled %x\n", + __func__, ppd->host_link_state, + ppd->link_enabled); } else { - xchg(&ppd->is_link_down_queued, 1); - queue_work(ppd->link_wq, &ppd->link_down_work); + if (xchg(&ppd->is_link_down_queued, 1) == 1) + dd_dev_info(dd, + "%s: link down request already queued\n", + __func__); + else + queue_work(ppd->link_wq, &ppd->link_down_work); } } } |