diff options
| author | Roland Dreier <roland@purestorage.com> | 2011-12-06 10:47:37 -0800 |
|---|---|---|
| committer | Roland Dreier <roland@purestorage.com> | 2011-12-06 10:47:37 -0800 |
| commit | 4af3ce0de0c12e5c17811eaefad36ab8e146c0fd (patch) | |
| tree | e243880d497d872c1c258799355598c13c00b737 /drivers/infiniband | |
| parent | 5611cc4572e889b62a7b4c72a413536bf6a9c416 (diff) | |
| download | lwn-4af3ce0de0c12e5c17811eaefad36ab8e146c0fd.tar.gz lwn-4af3ce0de0c12e5c17811eaefad36ab8e146c0fd.zip | |
IB/mlx4: Fix shutdown crash accessing a non-existent bitmap
Commit cfcde11c3d7a ("IB/mlx4: Use flow counters on IBoE ports") added
code that sets elements of counters[] to -1 if no counter is allocated,
but then goes ahead and passes every entry to mlx4_counter_free() on
shutdown. This is a bad idea, especially if MLX4_DEV_CAP_FLAG_COUNTERS
isn't set so there isn't even an underlying bitmap to free from.
Tested-by: Sean Hefty <sean.hefty@intel.com>
Cc: <stable@kernel.org>
Signed-off-by: Roland Dreier <roland@purestorage.com>
Diffstat (limited to 'drivers/infiniband')
| -rw-r--r-- | drivers/infiniband/hw/mlx4/main.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/infiniband/hw/mlx4/main.c b/drivers/infiniband/hw/mlx4/main.c index 77f3dbc0aaa1..18836cdf1e10 100644 --- a/drivers/infiniband/hw/mlx4/main.c +++ b/drivers/infiniband/hw/mlx4/main.c @@ -1244,7 +1244,8 @@ err_reg: err_counter: for (; i; --i) - mlx4_counter_free(ibdev->dev, ibdev->counters[i - 1]); + if (ibdev->counters[i - 1] != -1) + mlx4_counter_free(ibdev->dev, ibdev->counters[i - 1]); err_map: iounmap(ibdev->uar_map); @@ -1275,7 +1276,8 @@ static void mlx4_ib_remove(struct mlx4_dev *dev, void *ibdev_ptr) } iounmap(ibdev->uar_map); for (p = 0; p < ibdev->num_ports; ++p) - mlx4_counter_free(ibdev->dev, ibdev->counters[p]); + if (ibdev->counters[p] != -1) + mlx4_counter_free(ibdev->dev, ibdev->counters[p]); mlx4_foreach_port(p, dev, MLX4_PORT_TYPE_IB) mlx4_CLOSE_PORT(dev, p); |