On Wed, Jun 01, 2016 at 10:38:12AM -0400, Mike Marciniszyn wrote:
> Upstream commit 7049de65c9e5 into 4.6.
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Is it part of the commit message?
>
> 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.
>
> Reviewed-by: Sebastian Sanchez <sebastian.sanchez@xxxxxxxxx>
> Signed-off-by: Mike Marciniszyn <mike.marciniszyn@xxxxxxxxx>
> Signed-off-by: Dennis Dalessandro <dennis.dalessandro@xxxxxxxxx>
> Signed-off-by: Doug Ledford <dledford@xxxxxxxxxx>
> ---
> drivers/staging/rdma/hfi1/qp.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/staging/rdma/hfi1/qp.c b/drivers/staging/rdma/hfi1/qp.c
> index dc9119e..0401955 100644
> --- a/drivers/staging/rdma/hfi1/qp.c
> +++ b/drivers/staging/rdma/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);
> }
>
> /**
>
> --
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