[PATCH 3.16 158/212] net/mlx4_core: Fix VF overwrite of module param which disables DMFS on new probed PFs

[Ben Hutchings]

3.16.44-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Majd Dibbiny <majd@xxxxxxxxxxxx>

commit 95f1ba9a24af9769f6e20dfe9a77c863f253f311 upstream.

In the VF driver, module parameter mlx4_log_num_mgm_entry_size was
mistakenly overwritten -- and in a manner which overrode the
device-managed flow steering option encoded in the parameter.

log_num_mgm_entry_size is a global module parameter which
affects all ConnectX-3 PFs installed on that host.
If a VF changes log_num_mgm_entry_size, this will affect all PFs
which are probed subsequent to the change (by disabling DMFS for
those PFs).

Fixes: 3c439b5586e9 ("mlx4_core: Allow choosing flow steering mode")
Signed-off-by: Majd Dibbiny <majd@xxxxxxxxxxxx>
Reviewed-by: Jack Morgenstein <jackm@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Tariq Toukan <tariqt@xxxxxxxxxxxx>
Signed-off-by: David S. Miller <davem@xxxxxxxxxxxxx>
Signed-off-by: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
---
 drivers/net/ethernet/mellanox/mlx4/main.c | 2 --
 1 file changed, 2 deletions(-)

--- a/drivers/net/ethernet/mellanox/mlx4/main.c
+++ b/drivers/net/ethernet/mellanox/mlx4/main.c
@@ -585,8 +585,6 @@ static int mlx4_slave_cap(struct mlx4_de
 		return -ENOSYS;
 	}
 
-	mlx4_log_num_mgm_entry_size = hca_param.log_mc_entry_sz;
-
 	dev->caps.hca_core_clock = hca_param.hca_core_clock;
 
 	memset(&dev_cap, 0, sizeof(dev_cap));