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| author | Mike Marciniszyn <mike.marciniszyn@intel.com> | 2016-05-24 12:50:23 -0700 |
|---|---|---|
| committer | Doug Ledford <dledford@redhat.com> | 2016-05-26 12:21:10 -0400 |
| commit | 7049de65c9e520886f06d6f9deceaaed5d93fb7c (patch) | |
| tree | a6830c3cf1d7de51014c16aa3ca2645961cefa95 /drivers | |
| parent | bdd8a98ce465df31b07ff6314db9ed31a7c6bb0d (diff) | |
| download | linux-stable-7049de65c9e520886f06d6f9deceaaed5d93fb7c.tar.gz linux-stable-7049de65c9e520886f06d6f9deceaaed5d93fb7c.tar.bz2 linux-stable-7049de65c9e520886f06d6f9deceaaed5d93fb7c.zip | |
IB/hfi1: Fix hard lockup due to not using save/restore spin lock
Commit b9b06cb6feda
("IB/hfi1: Fix missing lock/unlock in verbs drain callback")
added a spin lock.
Unfortunately, the new lock code can be called from a base
level interrupt state, and an interrupt that can get stacked
will attempt to get the same lock.
Fix by using the flag save/restore spin lock variation.
Cc: stable@vger.kernel.org # 4.6+
Reviewed-by: Sebastian Sanchez <sebastian.sanchez@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')
| -rw-r--r-- | drivers/infiniband/hw/hfi1/qp.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/hfi1/qp.c b/drivers/infiniband/hw/hfi1/qp.c index 14f889e3655b..1a942ffba4cb 100644 --- a/drivers/infiniband/hw/hfi1/qp.c +++ b/drivers/infiniband/hw/hfi1/qp.c @@ -512,6 +512,7 @@ static void iowait_wakeup(struct iowait *wait, int reason) static void iowait_sdma_drained(struct iowait *wait) { struct rvt_qp *qp = iowait_to_qp(wait); + unsigned long flags; /* * This happens when the send engine notes @@ -519,12 +520,12 @@ static void iowait_sdma_drained(struct iowait *wait) * do the flush work until that QP's * sdma work has finished. */ - spin_lock(&qp->s_lock); + spin_lock_irqsave(&qp->s_lock, flags); if (qp->s_flags & RVT_S_WAIT_DMA) { qp->s_flags &= ~RVT_S_WAIT_DMA; hfi1_schedule_send(qp); } - spin_unlock(&qp->s_lock); + spin_unlock_irqrestore(&qp->s_lock, flags); } /** |