From: Ira Gusinsky Date: Thu, 2 Apr 2015 14:07:27 +0000 (+0300) Subject: net/mlx5_core: Avoid usage command work entry after writing command doorbell X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=21db507439ec3a76a9587f2ad50ad3e4d13f4440;p=linux-beck.git 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 Signed-off-by: Saeed Mahameed Signed-off-by: Eli Cohen Signed-off-by: David S. Miller --- diff --git a/drivers/net/ethernet/mellanox/mlx5/core/cmd.c b/drivers/net/ethernet/mellanox/mlx5/core/cmd.c index 290ae87fdef7..0d862696b876 100644 --- 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 */