Messages in this thread Patch in this message | | | From | Greg Kroah-Hartman <> | Subject | [PATCH 4.2 127/134] IB/mlx4: Fix potential deadlock when sending mad to wire | Date | Sat, 26 Sep 2015 13:56:19 -0700 |
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4.2-stable review patch. If anyone has any objections, please let me know.
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From: Jack Morgenstein <jackm@dev.mellanox.co.il>
commit 90c1d8b6350cca9d8a234f03c77a317a7613bcee upstream.
send_mad_to_wire takes the same spinlock that is taken in the interrupt context. Therefore, it needs irqsave/restore.
Fixes: b9c5d6a64358 ('IB/mlx4: Add multicast group (MCG) paravirtualization for SR-IOV') Signed-off-by: Jack Morgenstein <jackm@dev.mellanox.co.il> Signed-off-by: Or Gerlitz <ogerlitz@mellanox.com> Signed-off-by: Doug Ledford <dledford@redhat.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- drivers/infiniband/hw/mlx4/mcg.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-)
--- a/drivers/infiniband/hw/mlx4/mcg.c +++ b/drivers/infiniband/hw/mlx4/mcg.c @@ -206,15 +206,16 @@ static int send_mad_to_wire(struct mlx4_ { struct mlx4_ib_dev *dev = ctx->dev; struct ib_ah_attr ah_attr; + unsigned long flags; - spin_lock(&dev->sm_lock); + spin_lock_irqsave(&dev->sm_lock, flags); if (!dev->sm_ah[ctx->port - 1]) { /* port is not yet Active, sm_ah not ready */ - spin_unlock(&dev->sm_lock); + spin_unlock_irqrestore(&dev->sm_lock, flags); return -EAGAIN; } mlx4_ib_query_ah(dev->sm_ah[ctx->port - 1], &ah_attr); - spin_unlock(&dev->sm_lock); + spin_unlock_irqrestore(&dev->sm_lock, flags); return mlx4_ib_send_to_wire(dev, mlx4_master_func_num(dev->dev), ctx->port, IB_QPT_GSI, 0, 1, IB_QP1_QKEY, &ah_attr, NULL, mad);
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