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| author | Jack Morgenstein <jackm@dev.mellanox.co.il> | 2015-07-30 17:34:21 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-09-29 19:33:35 +0200 |
| commit | ea82d9b378eaa217c489ab7e49289b257dd04502 (patch) | |
| tree | cd983478afbb8e4c7d6a4c89f0e08ed829ea2e39 | |
| parent | ca3d0ab7bbd897ecb27911792127b3bd458d06b1 (diff) | |
| download | lwn-ea82d9b378eaa217c489ab7e49289b257dd04502.tar.gz lwn-ea82d9b378eaa217c489ab7e49289b257dd04502.zip | |
IB/mlx4: Fix potential deadlock when sending mad to wire
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>
| -rw-r--r-- | drivers/infiniband/hw/mlx4/mcg.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/infiniband/hw/mlx4/mcg.c b/drivers/infiniband/hw/mlx4/mcg.c index ed327e6c8fdc..a0559a8af4f4 100644 --- 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_ib_demux_ctx *ctx, struct ib_mad *mad) { 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); |