[PATCH net] mlx4_core: fix race on comm channel

From: Eugenia Emantayev <redacted>

Prevent race condition between commands on comm channel.
Happened while unloading the driver when switching from
event to polling mode. VF got completion on the last command
before switching to polling mode, but toggle was not changed.
After the fix - VF will not write the next command before
toggle is updated.

Signed-off-by: Eugenia Emantayev <redacted>
---
 drivers/net/ethernet/mellanox/mlx4/cmd.c |    8 ++++++++
 1 files changed, 8 insertions(+), 0 deletions(-)

diff --git a/drivers/net/ethernet/mellanox/mlx4/cmd.c b/drivers/net/ethernet/mellanox/mlx4/cmd.c
index eaf09d4..2f1f4a1 100644
--- a/drivers/net/ethernet/mellanox/mlx4/cmd.c
+++ b/drivers/net/ethernet/mellanox/mlx4/cmd.c

@@ -239,6 +239,7 @@ static int mlx4_comm_cmd_wait(struct mlx4_dev *dev, u8 op,
 {
 	struct mlx4_cmd *cmd = &mlx4_priv(dev)->cmd;
 	struct mlx4_cmd_context *context;
+	unsigned long end;
 	int err = 0;
 
 	down(&cmd->event_sem);

@@ -268,6 +269,13 @@ static int mlx4_comm_cmd_wait(struct mlx4_dev *dev, u8 op,
 	}
 
 out:
+	/* wait for comm channel ready
+	   this is necessary for prevention the race
+	   when switching between event to polling mode */
+	end = msecs_to_jiffies(timeout) + jiffies;
+	while (comm_pending(dev) && time_before(jiffies, end))
+		cond_resched();
+
 	spin_lock(&cmd->context_lock);
 	context->next = cmd->free_head;
 	cmd->free_head = context - cmd->context;