net/mlx5_core: Avoid usage command work entry after writing command doorbell

Avoid usage of command work entry in cmd_work_handler since it can be released
by mlx5_cmd_invoke before the work handler returns to running.

Signed-off-by: Ira Gusinsky <[email protected]>
Signed-off-by: Saeed Mahameed <[email protected]>
Signed-off-by: Eli Cohen <[email protected]>
Signed-off-by: David S. Miller <[email protected]>

diff --git a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
index 290ae87fdef7823e9884606a68680f0aa05a3db6..0d862696b8769843ec2ca369afe1103a297349ad 100644 (file)
--- a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c
@@ -515,10 +515,11 @@ static void cmd_work_handler(struct work_struct *work)
        ent->ts1 = ktime_get_ns();
 
        /* ring doorbell after the descriptor is valid */
+       mlx5_core_dbg(dev, "writing 0x%x to command doorbell\n", 1 << ent->idx);
        wmb();
        iowrite32be(1 << ent->idx, &dev->iseg->cmd_dbell);
-       mlx5_core_dbg(dev, "write 0x%x to command doorbell\n", 1 << ent->idx);
        mmiowb();
+       /* if not in polling don't use ent after this point */
        if (cmd->mode == CMD_MODE_POLLING) {
                poll_timeout(ent);
                /* make sure we read the descriptor after ownership is SW */